CHEM115 MidTerm Exam Review Azusa Pacific University - Correct Answers Indicated with Feedback.

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Grade 126 out of 160 (78%) Question 1 Correct Mark 1 out of 1 Flag question Question text The number 390000, expressed correctly in scientific notation, is ___. Select one: a. 3.9 x 10-6 b. 3... .9 x 105 c. 3.9 d. 3.9 x 10-5 Feedback The correct answer is: 3.9 x 105 Question 2 Incorrect Mark 0 out of 1 Flag question Question text A container holding a mixture of ice and water is placed in a 115 C oven. The ice-water mixture rises in temperature until all the ice has melted away. Select one: True False Feedback The correct answer is 'True'. Question 3 Correct Mark 1 out of 1 Flag question Question text 2.32 g is the same as ___. Select one: a. 232 kg b. 23.2 cg c. 2320 mg d. 0.0232 dg Feedback The correct answer is: 2320 mg Question 4 Correct Mark 1 out of 1 Flag question Question text A patient having a serious reaction caused by a peanut allergy has a doctor’s order to have 0.240 g of epinephrine. The liquid on hand contains 250 mg/5mL bottle. How many milliliters of the liquid are required? Select one: a. 4.8 mL b. 0.0048 mL c. 12 mL d. 1.2 mL Feedback The correct answer is: 4.8 mL Question 5 Correct Mark 1 out of 1 Flag question Question text Which of the following is a chemical change? Select one: a. evaporation of water b. melting of copper c. tearing paper d. frying an egg Feedback The correct answer is: frying an egg Question 6 Correct Mark 1 out of 1 Flag question Question text A 33.0 g of aluminum is heated on a stove. The temperature of the aluminum increases from 25 C to 120 C. How much heat energy was absorbed? (The specific heat of aluminum is 0.0215 cal/gC.) Select one: a. 67 cal b. 0.0075 cal c. 0.61 cal d. 13 cal Feedback The correct answer is: 67 cal Question 7 Correct Mark 1 out of 1 Flag question Question text The energy available by virtue of a rock sitting at the top of a cliff is Select one: a. chemical energy. b. potential energy. c. thermal energy. d. kinetic energy. Feedback The correct answer is: potential energy. Question 8 Correct Mark 1 out of 1 Flag question Question text Which of the following explanations is a testable hypothesis? Select one: a. A sugar crystal is forming faster because it is grown in cold environment. b. A plant is dying because of the direction of spinning of the earth. c. A bird lays more eggs because of the intensity of thunderstorms. d. A burp increases the weight of a baby. Feedback The correct answer is: A sugar crystal is forming faster because it is grown in cold environment. Question 9 Correct Mark 1 out of 1 Flag question Question text Accuracy tells us how close a measurement is to the true value. Select one: True False Feedback The correct answer is 'True'. Question 10 Correct Mark 1 out of 1 Flag question Question text Round the following to three significant figures: 399870 Select one: a. 4.00×105 b. 3.99×106 c. 4.00×106 d. 3.99×105 Feedback Your answer is correct. The correct answer is: 4.00×105 Question 11 Correct Mark 1 out of 1 Flag question Question text The density of ethanol at 20 C is 0.791 g/mL. How many milliliters of ethanol correspond to 12.0 g of ethanol at 20 C? Select one: a. 9.49 mL b. 15.2 mL c. 0.791 ml d. 30.6 mL Feedback The correct answer is: 15.2 mL Question 12 Correct Mark 1 out of 1 Flag question Question text Each of the numbers below is a measured quantity. Solve the calculation and give the correct number of significant figures.
 (17.8 x 0.1150) / 6.7 Select one: a. 0.31 b. 0.3 c. 0.306 d. 0.3055 Feedback The correct answer is: 0.31 Question 13 Correct Mark 1 out of 1 Flag question Question text The conversion of a solid directly into a gas is called ___. Select one: a. vaporization b. deposition c. sublimation d. melting Feedback The correct answer is: sublimation Question 14 Correct Mark 1 out of 1 Flag question Question text A weather forecaster predicts that the temperature for the day will reach 88 F. What is the Celsius value for the predicted temperature? Select one: a. 88C b. 273C c. 31C d. 304C Feedback The correct answer is: 31C Question 15 Correct Mark 1 out of 1 Flag question Question text The higher the temperature of something, the greater the kinetic energy of the particles from which it is made. Select one: True False Feedback The correct answer is 'True'. Question 16 Correct Mark 1 out of 1 Flag question Question text When aspirin is heated, it melts at 275 F. Convert this temperature into kelvins. Select one: a. 135 K b. 408 K c. -138 K d. 375 K Feedback The correct answer is: 408 K Question 17 Correct Mark 1 out of 1 Flag question Question text The number 84.3759 rounded to the nearest 1 significant figure is ___. Select one: a. 90 b. 8 c. 80 d. 84 Feedback The correct answer is: 80 Question 18 Correct Mark 1 out of 1 Flag question Question text The atomic number is Select one: a. the number of neutrons in an atom. b. the number of protons in an atom. c. the number of protons and neutrons in an atom. d. the number of subatomic particles in an atom. Feedback The correct answer is: the number of protons in an atom. Question 19 Correct Mark 1 out of 1 Flag question Question text 650. J is the same amount of energy as ________. Select one: a. 1550 cal b. 155 cal c. 2720 cal d. 2.72 cal e. 650. cal Feedback Your answer is correct. The correct answer is: 155 cal Question 20 Correct Mark 1 out of 1 Flag question Question text An alpha particle is identical to which of the following? Select one: a. the nucleus of a hydrogen atom b. an electron c. a beta radiation d. the nucleus of a helium-4-atom Feedback The correct answer is: the nucleus of a helium-4-atom Question 21 Correct Mark 1 out of 1 Flag question Question text Which of the following statements is true about a beta particle?
 Select one: a. it has the same mass as a helium nucleus b. when ejected from the nucleus formed has same mass as the original isotope c. when ejected from the nucleus of a radioisotope, the nucleus formed has one more proton d. it is the same as a gamma radiation Feedback The correct answer is: when ejected from the nucleus of a radioisotope, the nucleus formed has one more proton Question 22 Correct Mark 1 out of 1 Flag question Question text Which group contains the alkali metals? Select one: a. 1A b. 2A c. 3A d. 8A Feedback The correct answer is: 1A Question 23 Correct Mark 1 out of 1 Flag question Question text Atomic number and mass number differ in that atomic number is the number of ___ and mass number is ___ in an atom’s nucleus. Select one: a. protons/the number of neutrons b. neutrons/the number of protons c. protons/the number of electrons d. protons/the sum of protons and neutrons Feedback The correct answer is: protons/the sum of protons and neutrons Question 24 Correct Mark 1 out of 1 Flag question Question text Iron-59 has a half-life of 45 days. How much of a 50.0-gram sample would remain after 180 days? Select one: a. 1.00 g b. 3.13 g c. 25.0 g d. There is no way to determine the results. Feedback The correct answer is: 3.13 g Question 25 Correct Mark 1 out of 1 Flag question Question text What is the relationship of a metal atom to the right of another metal atom in the same period? Select one: a. The atom to the right is usually the smaller in diameter. b. The atom to the right is usually the smaller in atomic weight. c. The atom to the right is usually the smaller in atomic number. d. The atom to the right is more likely to have fewer isotopes. Feedback The correct answer is: The atom to the right is usually the smaller in diameter. Question 26 Correct Mark 1 out of 1 Flag question Question text The periodic table of the elements does not list whole numbers for atomic weights. Why? Select one: a. The atomic weights are not predictable. b. The atomic weights include protons and neutrons at 1 amu each, but they also include electrons, which weigh a lot less than one. c. The atomic weight is the weighted average of the masses of the known isotopes of an element. d. The atomic weights do not include isotopes. Feedback The correct answer is: The atomic weight is the weighted average of the masses of the known isotopes of an element. Question 27 Correct Mark 1 out of 1 Flag question Question text The atom’s structure characteristically has Select one: a. the protons and neutron within the nucleus. b. the electrons located outside the nucleus. c. mostly empty space. d. All of these choices are correct. Feedback The correct answer is: All of these choices are correct. Question 28 Correct Mark 1 out of 1 Flag question Question text The isotope of hydrogen that is a radioisotope has a mass number of 3. Select one: True False Feedback The correct answer is 'True'. Question 29 Correct Mark 1 out of 1 Flag question Question text An isotope of sodium contains 11 protons and 12 neutrons. Select one: a. The atom also contains 11 electrons. b. The atom also contains 12 electrons. c. The atom also contains 23 electrons. d. There are no other factors related to the 11 protons and 12 neutrons. Feedback The correct answer is: The atom also contains 11 electrons. Question 30 Correct Mark 1 out of 1 Flag question Question text Trace elements and vitamins are required for the body to function properly Select one: True False Feedback The correct answer is 'True'. Question 31 Correct Mark 1 out of 1 Flag question Question text A sample of magnesium weighs 10 grams. How many moles of magnesium are there in the sample? Select one: a. 10 moles b. 6 x 1023 moles c. 60 x 1023 atoms d. 0.4 moles Feedback The correct answer is: 0.4 moles Question 32 Correct Mark 1 out of 1 Flag question Question text The emission of an alpha particle only decreases the atomic mass of the atom. Select one: True False Feedback The correct answer is 'False'. Question 33 Correct Mark 1 out of 1 Flag question Question text Most elements have radioisotopes. What is a radioisotope? Select one: a. An isotope that has a different atomic number. b. An isotope that releases nuclear radiation. c. An isotope that releases electrical radiation. d. Any isotope that can absorb nuclear particles. Feedback The correct answer is: An isotope that releases nuclear radiation. Question 34 Correct Mark 1 out of 1 Flag question Question text Gamma rays require a thick slab of concrete or lead to block them because they Select one: a. have the lowest energy. b. are so energetic that they have a very high penetrating power. c. are large in size. d. are small in size. Feedback The correct answer is: are so energetic that they have a very high penetrating power. Question 35 Correct Mark 1 out of 1 Flag question Question text How many carbon(C) atoms are present in 30 moles of carbon? Select one: a. 1.20 x 101C atoms b. 1.80 x 1023 C atoms c. 3.60 x 102 C atoms d. 6.02 x 1023 C atoms Feedback The correct answer is: 1.80 x 1023 C atoms Question 36 Incorrect Mark 0 out of 1 Flag question Question text The mass in grams of one mole of an element is the element’s ___. Select one: a. atomic number b. atomic weight c. molar mass d. isotope number Feedback The correct answer is: atomic weight Question 37 Incorrect Mark 0 out of 1 Flag question Question text Potassium and magnesium cannot form a binary compound together. Select one: True False Feedback The correct answer is 'True'. Question 38 Correct Mark 1 out of 1 Flag question Question text Which of the following atom pairs would most likely be connected by an ionic bond? Select one: a. K and Br b. O and Br c. S and Br d. F and Br Feedback The correct answer is: K and Br Question 39 Correct Mark 1 out of 1 Flag question Question text Which ion has the same number of electrons as the noble gas argon? Select one: a. F- b. Mg2+ c. Br- d. Ca2+ Feedback The correct answer is: Ca2+ Question 40 Correct Mark 1 out of 1 Flag question Question text What is the mass of 0.00142 mole of vitamin C (C6H8O6)? Select one: a. 0.250 g b. 0.500 g c. 0.125 g d. 2.50 g Feedback The correct answer is: 0.250 g Question 41 Incorrect Mark 0 out of 1 Flag question Question text The name for the Cu2+ ion is Select one: a. copper ion. b. cobalt (II) ion. c. copper (I) ion. d. copper(II) ion. Feedback The correct answer is: copper(II) ion. Question 42 Correct Mark 1 out of 1 Flag question Question text The compound BaBr2 is named Select one: a. barium dibromide. b. barium (II) bromide. c. barium bromide. d. barium bromate. Feedback The correct answer is: barium bromide. Question 43 Correct Mark 1 out of 1 Flag question Question text The difference between an ionic bond and a covalent bond is that Select one: a. ionic bonds commonly occur between two metals and covalent bonds occur between metals and nonmetals. b. ionic bonds are between atoms that can share electrons; covalent bonds are between atoms that will donate/accept electrons. c. covalent bonds come about because of a sharing of electrons; ionic bonds do not. d. ionic bonds are between smaller atoms; covalent bonds are between large atoms. Feedback The correct answer is: covalent bonds come about because of a sharing of electrons; ionic bonds do not. Question 44 Correct Mark 1 out of 1 Flag question Question text How many molecules of aspirin (C9H8O4) are present in 41.40 g of aspirin? Select one: a. 0.2300 aspirin molecules b. 2.700 x 1026 aspirin molecules c. 9.600 x 1023 aspirin molecules d. 1.383 x 1023 aspirin molecules Feedback The correct answer is: 1.383 x 1023 aspirin molecules Question 45 Correct Mark 1 out of 1 Flag question Question text According to the octet rule, how many valence electrons are present in a chloride ion (Cl-)? Select one: a. 1 b. 2 c. 8 d. 4 Feedback The correct answer is: 8 Question 46 Correct Mark 1 out of 1 Flag question Question text NO3- is the ___ ion. Select one: a. nitrous b. nitrogen trioxide c. nitrite d. nitrate Feedback The correct answer is: nitrate Question 47 Correct Mark 1 out of 1 Flag question Question text Choose the electron dot structure for a magnesium atom. Select one: a. b. c. d. Feedback The correct answer is: Question 48 Correct Mark 1 out of 1 Flag question Question text The formula of calcium sulfate is ___. Select one: a. CaSO3 b. CaSO4 c. CaS d. CaS2 Feedback The correct answer is: CaSO4 Question 49 Correct Mark 1 out of 1 Flag question Question text What is the molar mass of magnesium chloride? Select one: a. 59.80 g/mol b. 90.40 g/mol c. 95.30 g/mol d. 125.90 g/mol Feedback The correct answer is: 95.30 g/mol Question 50 Correct Mark 1 out of 1 Flag question Question text A 1.0 x 102- gram sample is found to be pure alanine, an amino acid found in proteins. How many moles of alanine are in the sample? Select one: a. 0.20 moles b. 0.90 moles c. 1.1 moles d. 890 moles Feedback The correct answer is: 1.1 moles Question 51 Correct Mark 1 out of 1 Flag question Question text HPO42- is the ___ ion. Select one: a. hydrogen phosphate b. monophosphate c. phosphide d. phosphite Feedback The correct answer is: hydrogen phosphate Question 52 Correct Mark 1 out of 1 Flag question Question text Which of the following atom pairs would most likely be connected by a covalent bond? Select one: a. Na and O b. O and Cl c. Na and Cl d. K and F Feedback The correct answer is: O and Cl Question 53 Correct Mark 1 out of 1 Flag question Question text What is the formula of the ionic compound that forms between calcium ions and phosphate ions? Select one: a. CaPO4 b. Ca2PO4 c. Ca2(PO4)3 d. Ca3(PO4)2 Feedback The correct answer is: Ca3(PO4)2 Question 54 Correct Mark 1 out of 1 Flag question Question text What is the molar mass of isopentyl acetate, C7H14O2, a compound responsible for the odor of bananas? Select one: a. 130.19 g/mole b. 98.32 g/mole c. 146.58 g/mole d. 119.35 g/mole e. 13.19 g/mole Feedback The correct answer is: 130.19 g/mole Question 55 Correct Mark 1 out of 1 Flag question Question text The formula weight of magnesium fluoride is 62.30 amu. Select one: True False Feedback The correct answer is 'True'. Question 56 Correct Mark 1 out of 1 Flag question Question text The shape of H2O is bent. Select one: True False Feedback The correct answer is 'True'. Question 57 Correct Mark 1 out of 1 Flag question Question text The CaF bond in CaF2 is nonpolar. Select one: True False Feedback The correct answer is 'False'. Question 58 Incorrect Mark 0 out of 1 Flag question Question text Ketone is present in Vanillin. Select one: True False Feedback The correct answer is 'False'. Question 59 Correct Mark 1 out of 1 Flag question Question text Shampoos, perfumes, and plastics are organic compounds. Select one: True False Feedback The correct answer is 'True'. Question 60 Partially correct Mark 1 out of 1 Flag question Question text Matching: Choose the type of organic family that matches each compound. Answer 1Choose...disulfidethiolketoneCarboxylic acidaminealkene Answer 2Choose...disulfidethiolketoneCarboxylic acidaminealkene Answer 3Choose...disulfidethiolketoneCarboxylic acidaminealkene Answer 4Choose...disulfidethiolketoneCarboxylic acidaminealkene Answer 5Choose...disulfidethiolketoneCarboxylic acidaminealkene Answer 6Choose...disulfidethiolketoneCarboxylic acidaminealkene Feedback The correct answer is: → alkene, → Carboxylic acid, → thiol, → disulfide, → ketone, → amine Question 61 Correct Mark 1 out of 1 Flag question Question text Oxygen is more electronegative than carbon, so when an oxygen atom pulls the shared pair of bonding electrons toward itself to form a covalent bond, the oxygen atom carries Select one: a. a partial positive charge. b. no charge. c. a partial negative charge. d. both a partial positive charge and a negative charge. Feedback The correct answer is: a partial negative charge. Question 62 Correct Mark 1 out of 1 Flag question Question text A hydrocarbon contains only the elements ________. Select one: a. carbon and oxygen b. carbon and hydrogen c. hydrogen and oxygen d. carbon, hydrogen, and nitrogen e. carbon, hydrogen, and oxygen Feedback The correct answer is: carbon and hydrogen Question 63 Correct Mark 1 out of 1 Flag question Question text Carbon has six valence electrons. Select one: True False Feedback The correct answer is 'False'. Question 64 Correct Mark 1 out of 1 Flag question Question text The strongest noncovalent interaction that can occur between two methyl alcohol molecules is ___. Select one: a. dipole-dipole forces b. hydrogen bonding c. ion-dipole interaction d. London force Feedback The correct answer is: hydrogen bonding Question 65 Correct Mark 1 out of 1 Flag question Question text Most organic compounds are flammable. Select one: True False Feedback The correct answer is 'True'. Question 66 Correct Mark 1 out of 1 Flag question Question text There are vast numbers of organic compounds. Select one: True False Feedback The correct answer is 'True'. Question 67 Correct Mark 1 out of 1 Flag question Question text Organic chemistry is the study of the chemistry of compounds of ________. Select one: a. oxygen b. hydrogen c. polymers d. carbon e. living things Feedback The correct answer is: carbon Question 68 Incorrect Mark 0 out of 1 Flag question Question text The following molecule belongs to which organic family? Select one: a. ketone b. ether c. carboxylic acid d. ester Feedback The correct answer is: ester Question 69 Correct Mark 1 out of 1 Flag question Question text Which of the following is not typical of most hydrocarbons? Select one: a. poor solubility in water b. high flammability c. covalent bonding d. high melting point e. low boiling point Feedback The correct answer is: high melting point Question 70 Correct Mark 1 out of 1 Flag question Question text Which molecule is nonpolar even though it contains polar bonds? Select one: a. NH3 b. H2O c. CCF4 d. CHClF2 Feedback The correct answer is: CCF4 Question 71 Incorrect Mark 0 out of 1 Flag question Question text The molecule shown below contains an aldehyde functional group. Select one: True False Feedback The correct answer is 'False'. Question 72 Correct Mark 1 out of 1 Flag question Question text CH2Cl2 is polar. Select one: True False Feedback The correct answer is 'True'. Question 73 Correct Mark 1 out of 1 Flag question Question text The shape of formaldehyde CH2O (C is the central atom), a substance often used in building insulation materials, is ___. Select one: a. trigonal planar b. tetrahedral c. linear d. pyramidal Feedback The correct answer is: trigonal planar Question 74 Correct Mark 1 out of 1 Flag question Question text Organic compounds are always highly water soluble. Select one: True False Feedback The correct answer is 'False'. Question 75 Incorrect Mark 0 out of 1 Flag question Question text In the reaction below: Select one: a. CH3CH=CH2 is oxidized b. CH3CH=CH2 is reduced c. CH3CH2CH3 is reduced d. CH3CH=CH2 is neither oxidized nor reduced Feedback The correct answer is: CH3CH=CH2 is reduced Question 76 Correct Mark 1 out of 1 Flag question Question text Consider the burning of methane gas (CH4): Which statement is true about the reaction? Select one: a. energy is absorbed and it is non-spontaneous b. energy is released and it is non-spontaneous c. energy is absorbed and it is spontaneous d. energy is released and it is spontaneous Feedback The correct answer is: energy is released and it is spontaneous Question 77 Correct Mark 1 out of 1 Flag question Question text In a hydrolysis reaction, water is used to split a molecule Select one: True False Feedback The correct answer is 'True'. Question 78 Correct Mark 1 out of 1 Flag question Question text According to the following equation, what mass of silver nitrate would be required to react with 0.500 grams potassium chloride? Select one: a. 0.500 g b. 1.14 g c. 85.0 g d. 170 g Feedback The correct answer is: 1.14 g Question 79 Incorrect Mark 0 out of 1 Flag question Question text The reaction below is an example of a ___ reaction. Select one: a. dehydration b. hydrogenation c. hydrolysis d. combustion Feedback The correct answer is: dehydration Question 80 Correct Mark 1 out of 1 Flag question Question text A chemical reaction in which there is a transfer of electrons from one reactant to another reactant can be classified as Select one: a. decomposition reaction b. combustion reaction c. oxidation-reduction reaction d. double replacement reaction Feedback The correct answer is: oxidation-reduction reaction Question 81 Correct Mark 1 out of 1 Flag question Question text In chemical reaction Select one: a. the covalent bonds and ionic bonds that hold elements and compounds together remain intact as new bonds are formed b. the covalent and ionic bonds that hold elements and compounds together are broken and no new bonds are formed c. the covalent and ionic bonds that hold elements and compounds together are broken and new bonds are formed d. neither new bonds are formed nor old bonds broken Feedback The correct answer is: the covalent and ionic bonds that hold elements and compounds together are broken and new bonds are formed Question 82 Correct Mark 1 out of 1 Flag question Question text Lithium is a metal that reacts vigorously with oxygen. Which set of coefficents balance the equation below? Select one: a. 1,2,1 b. 2,2,1 c. 1,2,2 d. 4,1,2 Feedback The correct answer is: 4,1,2 Question 83 Correct Mark 1 out of 1 Flag question Question text Aluminum will react slowly with the oxygen in the air. When the equation below is balanced, with whole number coefficients, what is the coefficient on aluminum oxide? Select one: a. 4 b. 3 c. 2 d. 1 Feedback The correct answer is: 2 Question 84 Incorrect Mark 0 out of 1 Flag question Question text Which of the factors will increase the rate of a reaction? Select one: a. increasing activation energy b. increasing the temperature c. decreasing one of the reactant concentrations d. decreasing the temperature Feedback The correct answer is: increasing the temperature Question 85 Incorrect Mark 0 out of 1 Flag question Question text Sodium stearate is a soap that is produced from stearic acid, one of the fatty acids, by the reaction: The reaction that was set up with 0.25 g stearic acid and an excess of sodium hydroxide produced 0.25 grams soap. The percent yield was Select one: a. 100%. b. 93%. c. 25%. d. 1%. Feedback The correct answer is: 93%. Question 86 Correct Mark 1 out of 1 Flag question Question text Classify the reaction below as involving synthesis, decomposition, single replacement, or double replacement. Select one: a. double replacement b. single replacement c. decomposition d. synthesis Feedback The correct answer is: synthesis Question 87 Correct Mark 1 out of 1 Flag question Question text Isooctane, C8H18, a component of gasoline is a liquid at room temperature. How many moles of oxygen are required to completely react with 4 moles of isooctane? Select one: a. 50 b. 12 c. 100 d. 25 Feedback The correct answer is: 50 Question 88 Correct Mark 1 out of 1 Flag question Question text The catalyst utilized by biological systems for hydrogenation reactions is ___. Select one: a. platinum b. hydrogen c. an enzyme d. a carbon-carbon bond Feedback The correct answer is: an enzyme Question 89 Incorrect Mark 0 out of 1 Flag question Question text Figures A and B below represent reaction energy diagrams. Diagram that represents an endothermic reaction is Select one: a. B b. A c. Both A and B d. None of these choices Feedback The correct answer is: B Question 90 Correct Mark 1 out of 1 Flag question Question text In the reaction below, which element is oxidized? Select one: a. Mg b. Br2 c. neither Mg nor Br2 is oxidized Feedback The correct answer is: Mg Question 91 Correct Mark 1 out of 1 Flag question Question text In a synthesis reaction, one compound breaks down to form elements or simpler compounds Select one: True False Feedback The correct answer is 'False'. Question 92 Incorrect Mark 0 out of 1 Flag question Question text The reaction below is an example of a ___ reaction. Select one: a. hydrogenation b. hydrolysis c. dehydration d. neutralization Feedback The correct answer is: hydrolysis Question 93 Correct Mark 1 out of 1 Flag question Question text Barium and sulfur react to produce barium sulfide. What is the role of barium in this reaction? Select one: a. Barium is not affected by the processes of the chemical reaction. b. Barium is being reduced. c. Barium serves as the reducing agent. d. Barium is the oxidizing agent. Feedback The correct answer is: Barium serves as the reducing agent. Question 94 Incorrect Mark 0 out of 1 Flag question Question text An uninflated balloon full of air has a volume of 300.0 mL and contains 0.0240 mole of air. A 2.00 g piece of dry ice (solid CO2) is placed in the vessel and sealed. What is the volume of the balloon after the dry ice has vaporized? Assume constant temperature and pressure. Also, assume no change in the initial amount of air. Select one: a. 869 mL b. 300 mL c. 240 mL d. 455 mL Feedback The correct answer is: 869 mL Question 95 Correct Mark 1 out of 1 Flag question Question text Carbon dioxide gas occupies a volume of 20.0 L at 308K and 2.30 atm. What volume would it occupy at 416 K and 5.40 atm? Select one: a. 6.3 L b. 11.5 L c. 0.460 L d. 22.4 L Feedback The correct answer is: 11.5 L Question 96 Incorrect Mark 0 out of 1 Flag question Question text Arrange the terms solution, suspension, and colloid in order of increasing size of the dispersed particles. Select one: a. solution < suspension < colloid b. solution < colloid < suspension c. suspension < solution < colloid d. colloid < solution < suspension 35.When red blood cells are placed into a NaCl solution more dilute than 0.9%(w/v), which is the same solute concentration as found inside the cells, they will undergo ___ since dilute solution is ___. a) crenation/hypotonic b) crenation/hypertonic *c) hemolysis/hypotonic d) hemolysis/hypertonic Feedback The correct answer is: solution < colloid < suspension Question 97 Correct Mark 1 out of 1 Flag question Question text Which of the following ionic substances is soluble in water? Select one: a. Ca(OH)2 b. PbCO3 c. AgCl d. KNO3 Feedback The correct answer is: KNO3 Question 98 Correct Mark 1 out of 1 Flag question Question text A gas sample occupies 10.28 L at 8.34 atm. Its volume at 6.98 atm (assuming constant temperature conditions) is ___. Select one: a. 12.3 L b. 5.66 L c. 8.60 L d. 15.6 L Feedback The correct answer is: 12.3 L Question 99 Correct Mark 1 out of 1 Flag question Question text A pressurized tank contains nitrogen at 1.3 atm, oxygen at 0.7 atm, and helium at 0.1 atm. The reading of the pressure gauge is expected to be ___. Select one: a. 0.5 atm b. 0.91 atm c. 1.3 atm d. 2.1 atm Feedback The correct answer is: 2.1 atm Question 100 Correct Mark 1 out of 1 Flag question Question text The particles of a colloid are larger than the particles of a solution. Select one: True False Feedback The correct answer is 'True'. Question 101 Correct Mark 1 out of 1 Flag question Question text Which of the following ionic substances is insoluble in water? Select one: a. KNO3 b. BaSO4 c. Na3PO4 d. NH4Br Feedback The correct answer is: BaSO4 Question 102 Correct Mark 1 out of 1 Flag question Question text Henry’s law predicts that the higher the pressure the smaller the solubility of a gas in a liquid. Select one: True False Feedback The correct answer is 'False'. Question 103 Incorrect Mark 0 out of 1 Flag question Question text Avogadro’s law describes the relationship of ___. Select one: a. volume and moles gas b. temperature and moles gas c. temperature, pressure, and moles gas d. pressure and moles gas Feedback The correct answer is: volume and moles gas Question 104 Correct Mark 1 out of 1 Flag question Question text A 155-L helium balloon is heated from 24.0 C to 38.0 C. What would be its new volume assuming the pressure remains constant? Select one: a. 148 L b. 162 L c. 597 L d. 258 L Feedback The correct answer is: 162 L Question 105 Correct Mark 1 out of 1 Flag question Question text What volume of 2.00 % NaCl must be diluted to make 10.00 mL of 0.90% NaCl, also known as normal saline solution? Select one: a. 4.5 mL b. 0.18 mL c. 9.0 mL d. 22.2 mL Feedback The correct answer is: 4.5 mL Question 106 Correct Mark 1 out of 1 Flag question Question text An egg yolk with the volume of 3.75 mL contains 5.00 µg vitamin D (cholecalcifoerol). What is the concentration of vitamin D in mg/dL? (1 µg = 10-6 g and 1 dL = 10-1 L) Select one: a. 0.0188mg/dL b. 0.133 mg/dL c. 0.750 mg/dL d. 1.30 mg/dL Feedback The correct answer is: 0.133 mg/dL Question 107 Correct Mark 1 out of 1 Flag question Question text What is the concentration in parts per billion of an 8 L solution containing 0.017 g of potassium iodide? Select one: a. 2.1 x 102 ppb b. 3.1 x 102 ppb c. 1.1 x 102 ppb d. 5.8 x 102 ppb Feedback The correct answer is: 2.1 x 102 ppb Question 108 Correct Mark 1 out of 1 Flag question Question text Soaps are amphipathic compounds. Which statement best describes them? Select one: a. Soaps cannot be attracted to either polar or nonpolar compounds. b. Soaps dissolve best in polar solvents, which is why they can remove dirt. c. Soaps have a hydrophobic end, which will attract nonpolar substances, such as soil on clothing. d. The soaps that are the most effective in cleaning contain the calcium ion. Feedback The correct answer is: Soaps have a hydrophobic end, which will attract nonpolar substances, such as soil on clothing. Question 109 Correct Mark 1 out of 1 Flag question Question text What is the %(w/v) of a 1500mL solution containing 45 g of NaCl? Select one: a. 5.0% b. 3.0% c. 2.0% d. 0.030% Feedback The correct answer is: 3.0% Question 110 Correct Mark 1 out of 1 Flag question Question text The cause of chronic hypertension is Select one: a. high blood pressure. b. blood moving too fast though the arteries that are dilated. c. constricted movement of blood through blood vessels. d. the inability of the body to respond to a change in posture. Feedback The correct answer is: constricted movement of blood through blood vessels. Question 111 Correct Mark 1 out of 1 Flag question Question text Which is a pure substance? Select one: a. calcium chloride and potassium chloride crystals in a beaker b. air c. water d. sodium chloride and potassium chloride dissolved in water Feedback The correct answer is: water Question 112 Correct Mark 1 out of 1 Flag question Question text A steel tank is filled with nitrogen gas at a pressure of 2.30 atm. What is this pressure in torr? Select one: a. 2.30 torr b. 1750 torr c. 3.03 x 10-3 torr d. 760 torr Feedback The correct answer is: 1750 torr Question 113 Incorrect Mark 0 out of 1 Flag question Question text The equation: has the following equilibrium constant expression. Select one: a. b. c. d. Feedback The correct answer is: Question 114 Incorrect Mark 0 out of 1 Flag question Question text Antacids may contain which ion to reduce acidity? Select one: a. Na+ b. CO3­2– c. Al3+ d. Cl– Feedback The correct answer is: CO3­2– Question 115 Incorrect Mark 0 out of 1 Flag question Question text When one is referring to pH, what is the meaning of the p? Select one: a. Take the log of the number. b. Multiply the p constant by the number. c. Take the negative log of the number. d. All are possible depending on the number following the p. Feedback The correct answer is: Take the negative log of the number. Question 116 Incorrect Mark 0 out of 1 Flag question Question text When we talk about pH we are referring to the concentration of hydronium ions present. If the concentration of hydronium in a solution is 1.0 x 10-8 M, what is the hydroxide ion concentration? Select one: a. 1.0 x 10-6 M b. 9.0 x 10-8 M c. 1.0 x 10-14 M d. The concentration cannot be predicted. Feedback The correct answer is: 1.0 x 10-6 M Question 117 Correct Mark 1 out of 1 Flag question Question text What is the concentration of [H3O+] in an aqueous solution when the [OH-] is 5.2 x 10-9 M? Select one: a. 1.9 x 10-6 M b. 5.7 M c. 1.0 x 10-14 M d. 9.8 x 10-9 M Feedback The correct answer is: 1.9 x 10-6 M Question 118 Incorrect Mark 0 out of 1 Flag question Question text 15.00 mL of 0.100 M NaOH is required to completely neutralize 25.00 mL of an HCl solution. What is the concentration of the HCl solution? Select one: a. 0.0600 M b. 0.100 M c. 0.167 M d. 1.50 M Feedback The correct answer is: 0.0600 M Question 119 Correct Mark 1 out of 1 Flag question Question text Which of the following is the conjugate acid of NH3? Select one: a. NH2- b. NH4+ c. HNO3 d. H3O+ Feedback The correct answer is: NH4+ Question 120 Correct Mark 1 out of 1 Flag question Question text In the reaction: NO2- is the Select one: a. conjugate base of H2O. b. conjugate base of HNO2. c. conjugate acid of HNO2. d. conjugate base of H3O+. Feedback The correct answer is: conjugate base of HNO2. Question 121 Incorrect Mark 0 out of 1 Flag question Question text In the reaction: The conjugate acid of water is ___. Select one: a. HNO2 b. H2O c. H3O+ d. NO2- Feedback The correct answer is: H3O+ Question 122 Correct Mark 1 out of 1 Flag question Question text A conjugate acid-base pair Select one: a. is related by the loss and gain of H+ between 2 corresponding compounds on opposite sides of the reaction arrow. b. has the base donating an H+ to form its conjugate base. c. has the acid donating an H+ to form its conjugate acid. d. is not related in any way. Feedback The correct answer is: is related by the loss and gain of H+ between 2 corresponding compounds on opposite sides of the reaction arrow. Question 123 Correct Mark 1 out of 1 Flag question Question text Choose the equilibrium constant that indicates the greatest relative amount of reactant concentration at equilibrium. Select one: a. 1.1 x 10–7 b. 2.3 x 107 c. 6.7 x 102 d. 8.3 x 10–2 Feedback The correct answer is: 1.1 x 10–7 Question 124 Correct Mark 1 out of 1 Flag question Question text When a reaction is at equilibrium, Select one: a. it has no products. b. the rate of the forward reaction is equal to the rate of its reverse. c. it occurs very quickly using up all of the reactants. d. it produces the same amount of product as reactant. Feedback The correct answer is: the rate of the forward reaction is equal to the rate of its reverse. Question 125 Correct Mark 1 out of 1 Flag question Question text Which material would be effective for neutralizing a minor acid spill? Select one: a. soap solution b. vinegar solution c. baking soda d. household ammonia Feedback The correct answer is: baking soda Question 126 Incorrect Mark 0 out of 1 Flag question Question text The pH of blood is maintained at 7.35-7.45 by the following buffer system: The H2CO3 is produced by the reaction of CO2 with water according to the equation: When one exercises, there is increased cellular output of CO2. What effect will this have on the pH of the blood if the excess CO2 is not eliminated? Select one: a. The pH will increase. b. The pH will decrease. c. The pH will remain the same. d. It is impossible to predict the effect. Feedback The correct answer is: The pH will decrease. Question 127 Correct Mark 1 out of 1 Flag question Question text Acids and bases can react with and damage many compounds that are vital to living organisms. Select one: True False Feedback The correct answer is 'True'. Question 128 Incorrect Mark 0 out of 1 Flag question Question text Which of the conditions below would drive this reaction to the right? pyruvic acid lactic acid Select one: a. removing hydronium ion b. adding lactic acid c. adding water d. adding pyruvic acid Feedback The correct answer is: adding pyruvic acid Question 129 Correct Mark 1 out of 1 Flag question Question text Which of the following statements is true? Select one: a. A catalyst used in a system that reaches a point of equilibrium decreases the reverse reactions and increases the forward reactions. b. A catalyst used in a reversible reaction decreases the forward reactions but increases the reverse reactions. c. A catalyst used in a reversible reaction increases the rate of both the forward and reverse reactions to the same extent but does not change the point of equilibrium. d. A catalyst used in a system that reaches a point of equilibrium changes the point of equilibrium and decreases the rate of forward reactions only. Feedback The correct answer is: A catalyst used in a reversible reaction increases the rate of both the forward and reverse reactions to the same extent but does not change the point of equilibrium. Question 130 Incorrect Mark 0 out of 1 Flag question Question text Whenever an equilibrium constant, Keq, has a value greater than 1, which of the following statements is true at equilibrium? Select one: a. The concentration of reactants is greater than the concentration of the products. b. The concentration of products is the same as the concentration of reactants. c. The concentration of the products is greater than the concentration of the reactants. d. Relative composition of reaction mixture cannot be predicted. Feedback The correct answer is: The concentration of the products is greater than the concentration of the reactants. Question 131 Correct Mark 1 out of 1 Flag question Question text In the reaction below: Increasing the concentration of Cl2 will ___ at equilibrium. Select one: a. increase the concentration of PCl5 b. increase the concentration of PCl3 c. decrease the concentration of PCl5 d. have no effect Feedback The correct answer is: increase the concentration of PCl5 Question 132 Correct Mark 1 out of 1 Flag question Question text The reaction of benzoic acid and sodium hydroxide Select one: a. produces sodium benzoate, a salt. b. results in a compound that is water soluble. c. goes all the way to the right. d. All of these answer choices are correct. Feedback The correct answer is: All of these answer choices are correct. Question 133 Incorrect Mark 0 out of 1 Flag question Question text When the ester ethyl butanoate, CH3CH2CH2COOCH2CH3, is hydrolyzed under basic conditions, which compounds are the products? Select one: a. ethyl alcohol and butanoic acid b. butanol and ethanoic (acetic) acid c. ethyl alcohol and the butanoate ion d. butanol and the ethanoate ion Feedback The correct answer is: ethyl alcohol and the butanoate ion Question 134 Incorrect Mark 0 out of 1 Flag question Question text Phenol forms a basic solution in water. Select one: True False Feedback The correct answer is 'False'. Question 135 Incorrect Mark 0 out of 1 Flag question Question text Phenols are organic acids, as are carboxylic acids. The difference is that Select one: a. the phenols have a Ka that is larger than the carboxylic acids. b. the phenols are much stronger acids. c. the carboxylic acids are significantly stronger. d. the carboxylic acids are much larger than the phenols. Feedback The correct answer is: the carboxylic acids are significantly stronger. Question 136 Correct Mark 1 out of 1 Flag question Question text The linear alkane that contains seven carbon atoms is called ___. Select one: a. butane b. heptane c. hexane d. nonane Feedback The correct answer is: heptane Question 137 Correct Mark 1 out of 1 Flag question Question text The molecule responsible for the hot taste of chili peppers is capsaicin. Capsaicin is a phenol because it has Select one: a. a double bond. b. an amide within its structure. c. a trans stereochemistry at its double bond. d. an -OH attached to a benzene ring. Feedback The correct answer is: an -OH attached to a benzene ring. Question 138 Correct Mark 1 out of 1 Flag question Question text The larger the carboxylic acid, the more hydrogen bonding occurs between molecules. Select one: True False Feedback The correct answer is 'False'. Question 139 Correct Mark 1 out of 1 Flag question Question text Which raises the pH when added to water? Select one: a. ethyl alcohol b. propanoic acid c. methyl amine d. methyl alcohol Feedback The correct answer is: methyl amine Question 140 Correct Mark 1 out of 1 Flag question Question text Provide the IUPAC name for the compound below. Select one: a. 2-methyl-5-heptanoic acid b. 2-ethyl-5-methylhexanoic acid c. 6-methyl-3-heptanoic acid d. 6-methylheptanoic acid Feedback The correct answer is: 2-ethyl-5-methylhexanoic acid Question 141 Correct Mark 1 out of 1 Flag question Question text When the ester ethyl butanoate, CH3CH2CH2COOCH2CH3, is hydrolyzed under acidic conditions, which compounds are the products? Select one: a. ethyl alcohol and butanoic acid b. butanol and ethanoic (acetic acid) c. ethyl alcohol and the butanoate ion d. butanol and the ethanoate ion Feedback The correct answer is: ethyl alcohol and butanoic acid Question 142 Correct Mark 1 out of 1 Flag question Question text What is the IUPAC name of the molecule below? Select one: a. octanoic acid b. 6-ethyl-4-methylhexanoic acid c. 4,6-dimethyloctanoic acid d. 3,5-dimethyloctanoic acid Feedback The correct answer is: 4,6-dimethyloctanoic acid Question 143 Incorrect Mark 0 out of 1 Flag question Question text What is the major organic product of the following reaction? Select one: a. 1-propanol b. 2-propanol c. propanal d. propanone Feedback The correct answer is: 2-propanol Question 144 Correct Mark 1 out of 1 Flag question Question text An amide can be identified by noting that Select one: a. there is a nitrogen incorporated in the structure. b. there is a nitrogen attached to an oxygen from a carbon. c. all of the carbon chains attach to a nitrogen. d. a nitrogen attaches to a carbonyl carbon. Feedback The correct answer is: a nitrogen attaches to a carbonyl carbon. Question 145 Correct Mark 1 out of 1 Flag question Question text The carboxylic acids share which characteristic with the phenols? Select one: a. They have relatively high boiling points. b. They are capable of forming hydrogen bonds. c. They are weak acids. d. All of these answer choices are correct. Feedback The correct answer is: All of these answer choices are correct. Question 146 Incorrect Mark 0 out of 1 Flag question Question text Which of the following compounds has the highest boiling point and melting point? Select one: a. Hexane b. Propane c. Pentane d. Octane Feedback The correct answer is: Octane Question 147 Correct Mark 1 out of 1 Flag question Question text Given the following amines: 1ºamine 2ºamine 3º amine These three amines all have the same formula weight. Rank them in order of increasing boiling point. (From lowest to highest.) Select one: a. 1º < 2º < 3º b. 2º < 1º < 3º c. 3º < 2º < 1º d. 3º < 1º < 2º Feedback The correct answer is: 3º < 2º < 1º Question 148 Incorrect Mark 0 out of 1 Flag question Question text Provide the IUPAC name for the following organic compound. Select one: a. N-Methyl-2-butamine b. methylbutanamine c. dimethypropyllamine d. butylmethanamine Feedback The correct answer is: N-Methyl-2-butamine Question 149 Correct Mark 1 out of 1 Flag question Question text What is the name of this compound? Select one: a. ethylmethyl-sec-butyl-ammonium b. ethylmethylbutylammonium c. N-ethyl-N-methyl-3-butamine d. N-ethyl-N-methyl-2-butanamine Feedback The correct answer is: N-ethyl-N-methyl-2-butanamine Question 150 Incorrect Mark 0 out of 1 Flag question Question text The correct IUPAC name for the molecule below is ___. Select one: a. 1-pentene b. 2,3-dimethyl-1-pentyne c. 2,3,3-trimethyl-1-butyne d. 2,3-dimethyl-1-heptene Feedback The correct answer is: 2,3-dimethyl-1-pentyne [Show More]

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