Azusa Pacific University: CHEM 115 Week 4 Quiz. 100% Score Rate.

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CHEM 115 Week 4 Quiz In the equation: Select one: a. H2CO3 and H3O+ are conjugate pairs b. H2CO3 is not amphoteric c. H2CO3 and HCO3 - are conjugate pairs d. H2CO3 and H2O are conjugate p... air The effect of a catalyst on an equilibrium is Select one: a. to speed up the reaction to the left. b. to speed up the reaction to the right. c. to speed up the reaction equally in both directions. d. to shift the reaction in the direction of the catalyst. For a buffer to continue to work effectively, the pH of a buffer has to be close to the pKa of the conjugate acid. Select one: True False Which of the following is not a common characteristic of a base? Select one: a. it turns litmus pink/red b. it feels slippery c. it tastes bitter d. all of these choices are common characteristics of bases The Ka for the reaction of acetic acid and water shown below is 1.8 x 10-5. Which of the following statements is true at pH 7? Select one: a. there is much more acetic acid than acetate ion b. there is more acetate ion than acetic acid c. the concentration of acetate ion is equal to that of acetic acid d. the pH is lower than pKa of acetic acid Carboxylic acids, when compared with other molecules of similar size, Select one: a. have relatively lower melting points. b. have relatively higher boiling points. c. have a smaller number of hydrogen bonds. d. have more nonpolar locations. Which compound is not an amine? Select one: A B Correct C D How many alkane constitutional isomers exist with the formula C5H12? Select one: a. 2 b. 3 c. 4 d. more than 5 Hydocarbons are organic compounds that Select one: a. contain carbon and hydrogen atoms only. b. are soluble in water. c. are polar molecules. d. contain carbon, hydrogen, and halogen atoms. Calculate the pH of a solution containing 0.15 moles KOH dissolved in enough water to produce 2 liters of solution. Select one: a. pH = 0.075 b. pH = 0.15 c. pH = 1.12 d. pH = 12.88 A Ka can be calculated for some chemical reactions. The Ka is Select one: a. the Keq for the reaction to the right. b. the Keq for the reaction to the left. c. the Keq for the dissociation of an acid. d. the pH of a very weak solution. The carbonic acid/bicarbonate buffer is important in maintaining the proper pH of human blood. Diarrhea can lead to the loss of HCO3-. According to LeChatelier’s principle, removal of HCO3- will shift the above equilibrium to the ___ and result in a(n) ___ in blood pH. Select one: a. left/decrease b. right/decrease c. left/increase d. right/increase In the Haber process for the production of ammonia, Which will not increase the amount of ammonia at equilibrium? Select one: a. increasing the concentration of N2 b. increasing the concentration of H2 c. increasing the concentration of N2 and H2 d. addition of a catalyst Acidic solutions have an H+ concentration Select one: a. greater than the OH- concentration and a pH greater than 7.0. b. greater than the OH- concentration and a pH less than 7.0. c. less than the OH- concentration and a pH greater than 7.0. d. less than the OH- concentration and a pH less than 7.0. The organic product formed when propanoic acid reacts with ethanol in the presence of an acid catalyst is called Select one: a. ethyl propanoic acid. b. ethylpropanoate. c. propylethanoate. d. propylethanoic acid Carbon must form how many bonds? Select one: a. 1 b. 2 c. 3 d. 4 Predict the organic product formed when heat is applied to the compound below: Select one: A B C D Correct This compound is mescaline, a hallucinogen. Which of the following statements is true? Select one: a. Mescaline is an amine. b. Mescaline contains an alcohol group. c. Mescaline is a carboxylic acid. d. Mescaline is an amine and contains an alcohol group. One characteristic of basic solution is that Select one: a. the solution would turn litmus red. b. the solution would have a slippery feel to it. c. the solution would have a sour taste. d. the solution would dissolve some metals. Which of the following is the correct statement concerning the equation below? Select one: a. HSO4– is the conjugate base of SO4– b. HSO4– is the conjugate base of H3O+ c. H2O is the conjugate base of HSO4– d. SO42– is the conjugate base of HSO4– One liter of a solution is found to contain 0.022 moles of HCl. Calculate the pH of the solution. Assume complete dissociation. Select one: a. pH = 0.022 b. pH = 1.00 c. pH = 2.2 d. pH = 1.66 A buffer is capable of reducing the effect of the addition of small amounts of hydronium or hydroxide ion to a solution. Select one: True False The Ka for the reaction of acetic acid and water shown below is 1.8 x 10-5 Which of the following statements is true at pH 7? Select one: a. there is much more acetic acid than acetate ion b. there is more acetate ion than acetic acid c. the concentration of acetate ion is equal to that of acetic acid d. the pH is lower than pKa of acetic acid Which of the following lowers the pH when added to water? Select one: a. ethyl alcohol b. propanoic acid c. methyl amine d. methyl alcohol An amine will be converted into its conjugate acid by Select one: a. application of heat. b. reaction with an oxidizing agent. c. reaction with a strong acid. d. reaction with a strong base. Give the IUPAC name of the following carboxylic acid? Select one: a. 4-propylnanoic acid b. 3-octyl-butanoic acid c. 4-butyl-3-methylheptanoic acid d. 3-methyl-4-propyloctanoic acid Which of the following pairs of compounds represent constitutional isomers? Select one: a. 2-methylpropane and Pentane b. 2,2-dimethylbutane and 3-methylpentane c. 2,2-dimethylpropane and 2-methylpentane d. 2-methylbutane and 2-methylpropane The reaction below is an example of what kind of reaction? Select one: a. neutralization b. hydrolysis c. esterification d. saponification [Show More]

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