Chemistry > EXAM > CHEM 120A- Exam 3 Practice Questions and answers (All)

CHEM 120A- Exam 3 Practice Questions and answers

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1. (CH8) If 0.45 mol of NaCl is dissolved in 0.150 L, what is the molarity of NaCl? Molarity = 0.45 mol NaCl/0.150 L = 3.0 mol/L = 3.0 M 2. (CH8) Circle the solution in each group that will ha... ve the higher boiling point CIRCLE ONE for each row 1 mol KOH in 1 L H2O or 1 mol ZnCl2 in 1 L H2O 1 mol acetylene (C2H2) in 1 L H2O or 1 mol NaCl in 1 L H2O 0.5 mol AlCl3 in 1 L H2O or 1.5 mol glucose (C6H12O6) in 1 L H2O 3. (CH8) Use the diagram below for the following questions. a. What is C? semi-permeable membrane b. What is the function of C? semi-permeable membrane allows small molecules and ions to _pass through membrane but not larger molecules and ions c. If the concentration of glucose is greater in B than in D, what direction does water flow? Place an arrow in the box below the diagram to indicate direction of flow. d. Where would pressure be applied for reverse osmosis? Circle one: A or E 4. (CH9) In a chemical reaction, the rate of the reaction can be increased by which of the following? A. decreasing the temperature B. changing the size of the container C. adding water to the reaction D. adding product molecules to the reaction mixture E. increasing the concentration of the reactants 5. (CH10) What is the appropriate equation for the equilibrium between carbon dioxide and water? A. H2O(l ) + CO(g) ↔ H2CO3(aq) B. H2O(l ) + 2 CO2(g) ↔ H2CO3(aq) C. H2O(l ) + CO2(g) ↔ H2CO3(aq) D. H2O(l ) + CO2(g) ↔ HCO3(aq) E. H2O(l ) + CO2(g) ↔ H2CO2(aq) [Show More]

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