EP 5 Sample Midterm December 2009

EP 5 Sample Exam December 2009

Matching

Match each item with the correct statement below.
a. activated complex d. activation energy
b. reaction rate e. free energy
c. inhibitor


____ 1. the minimum energy colliding particles must have in order to react

____ 2. arrangement of atoms at the peak of an energy barrier

____ 3. the number of atoms, ions, or molecules that react in a given time to form products

____ 4. a substance that interferes with a catalyst

____ 5. energy available to do work

Match each item with the correct statement below.
a. spontaneous reaction d. reaction mechanism
b. entropy e. elementary reaction
c. chemical equilibrium


____ 6. when the forward and reverse reactions take place at the same rate

____ 7. a reaction that releases free energy

____ 8. the measure of disorder

____ 9. Reactants are converted to products in a single step.

____ 10. includes all elementary reactions of a complex reaction

Match each item with the correct statement below.
a. acid dissociation constant d. Lewis acid
b. diprotic acid e. pH
c. hydrogen-ion donor


____ 11. can accept an electron pair

____ 12. acid with two ionizable protons

____ 13. Brønsted-Lowry acid

____ 14. negative logarithm of the hydrogen ion concentration

____ 15. ratio of the concentration of the dissociated to the undissociated form

Match each item with the correct statement below.
a. salt hydrolysis d. equivalence point
b. end point e. buffer capacity
c. titration


____ 16. process of adding a known amount of solution of known concentration to determine the concentration of another solution

____ 17. The number of moles of hydrogen ions equals the number of moles of hydroxide ions.

____ 18. Indicator changes color.

____ 19. Cations or anions of a dissociated salt remove hydrogen ions from or donate hydrogen ions to water.

____ 20. the amount of acid or base that can be added to a buffer solution before a significant change in pH occurs

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.

____ 21. Which expression represents a reaction rate?
a. time/mass c. energy/time
b. number/time d. time/energy


____ 22. Activation energy is ____.
a. the heat released in a reaction
b. an energy barrier between reactants and products
c. the energy given off when reactants collide
d. generally very high for a reaction that takes place rapidly


____ 23. Why does a catalyst cause a reaction to proceed faster?
a. There are more collisions per second only.
b. The collisions occur with greater energy only.
c. The activation energy is lowered only.
d. There are more collisions per second and the collisions are of greater energy.


____ 24. If a reaction is reversible, what are the relative amounts of reactant and product at the end of the reaction?
a. no reactant; all product
b. no product; all reactant
c. some product; some reactant
d. The relationship between reactants and products cannot be determined.


____ 25. What happens to a reaction at equilibrium when more reactant is added to the system?
a. The reaction makes more products. c. The reaction is unchanged.
b. The reaction makes more reactants. d. The answer cannot be determined.


____ 26. Which of the following statements is true?
a. All spontaneous processes are exothermic.
b. All nonspontaneous processes are endothermic.
c. All spontaneous processes release free energy.
d. Entropy always increases in a spontaneous process.


____ 27. What determines whether or not a reaction is spontaneous?
a. change in molar volume and heat change
b. change in enthalpy only
c. enthalpy change and entropy change
d. change in entropy only


____ 28. Which variable is NOT required to calculate the Gibbs free-energy change for a chemical reaction?
a. change in enthalpy c. temperature in kelvins
b. temperature in C d. change in entropy


____ 29. What is the order of the following reaction? A + 2B  C + D
a. zero c. second
b. first d. third


____ 30. What information is NOT given by an overall equation for a chemical reaction?
a. the relative numbers of molecules used
b. the probable order of the reaction
c. the number of atoms participating in the reaction
d. the reaction mechanism


____ 31. Which of the following reactions illustrates amphoterism?
a. H O + H O H O + OH c. HCl + H O H O + Cl
b. NaCl Na + OH d. NaOH Na + OH


____ 32. What is the charge on the hydronium ion?
a. 2– c. 0
b. 2– d. 1+


____ 33. The products of self-ionization of water are ____.
a. H O and H O c. OH and H
b. OH and OH d. OH and H


____ 34. Which type of solution is one with a pH of 8?
a. acidic
b. basic
c. neutral
d. The type varies, depending on the solution.


____ 35. Which of these solutions is the most basic?
a. [H ] = 1 10 M c. [H ] = 1 10 M
b. [OH ] = 1 10 M d. [OH ] = 1 10 M


EP 5 Sample Exam December 2009
Answer Section

MATCHING

1. ANS: D DIF: L1 REF: p. 543 OBJ: 18.1.1

2. ANS: A DIF: L1 REF: p. 544 OBJ: 18.1.1

3. ANS: B DIF: L1 REF: p. 542 OBJ: 18.1.1

4. ANS: C DIF: L1 REF: p. 547 OBJ: 18.1.2

5. ANS: E DIF: L1 REF: p. 566 OBJ: 18.4.1

6. ANS: C DIF: L1 REF: p. 550 OBJ: 18.2.1

7. ANS: A DIF: L1 REF: p. 567 OBJ: 18.4.1

8. ANS: B DIF: L1 REF: p. 569 OBJ: 18.4.2

9. ANS: E DIF: L1 REF: p. 578 OBJ: 18.5.2

10. ANS: D DIF: L1 REF: p. 578 OBJ: 18.5.2

11. ANS: D DIF: L1 REF: p. 592 OBJ: 19.1.2

12. ANS: B DIF: L1 REF: p. 588 OBJ: 19.1.2

13. ANS: C DIF: L1 REF: p. 590 OBJ: 19.1.2

14. ANS: E DIF: L1 REF: p. 596 OBJ: 19.2.2

15. ANS: A DIF: L1 REF: p. 606 OBJ: 19.3.1

16. ANS: C DIF: L1 REF: p. 613, p. 614, p. 615
OBJ: 19.4.1

17. ANS: D DIF: L1 REF: p. 613 OBJ: 19.4.2

18. ANS: B DIF: L1 REF: p. 615 OBJ: 19.4.2

19. ANS: A DIF: L1 REF: p. 619 OBJ: 19.5.1

20. ANS: E DIF: L1 REF: p. 621 OBJ: 19.5.2

MULTIPLE CHOICE

21. ANS: B DIF: L1 REF: p. 542 OBJ: 18.1.1

22. ANS: B DIF: L1 REF: p. 543 OBJ: 18.1.1

23. ANS: C DIF: L1 REF: p. 546, p. 547
OBJ: 18.1.2

24. ANS: C DIF: L1 REF: p. 549, p. 550
OBJ: 18.2.1

25. ANS: A DIF: L2 REF: p. 552, p. 553
OBJ: 18.2.2

26. ANS: C DIF: L1 REF: p. 571 OBJ: 18.4.3

27. ANS: C DIF: L2 REF: p. 572 OBJ: 18.4.3

28. ANS: B DIF: L2 REF: p. 572 OBJ: 18.4.4

29. ANS: D DIF: L2 REF: p. 577 OBJ: 18.5.1

30. ANS: D DIF: L2 REF: p. 578 OBJ: 18.5.2

31. ANS: A DIF: L2 REF: p. 592 OBJ: 19.1.2

32. ANS: D DIF: L1 REF: p. 594 OBJ: 19.2.1

33. ANS: D DIF: L1 REF: p. 594 OBJ: 19.2.1

34. ANS: B DIF: L1 REF: p. 597 OBJ: 19.2.2

35. ANS: C DIF: L2 REF: p. 597, p. 598
OBJ: 19.2.2