SAT Chemistry Practice Test: Chemical Equilibrium

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Question 15 questions

Time 10 minutes

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1. For the reaction A + B 7-4480_SATChem_Ch10_0001_002.jpg C + D, the equilibrium constant can be expressed as:

A.
B.
C.
D.
E.

2. The concentrations in an expression of the equilibrium constant are given in

A. mol/mL
B. g/L
C. gram-equivalents/L
D. mol/L
E.

3. In the equilibrium expression for the reaction

BaSO4(s) Ba2+(aq) + SO42-(aq)

Ksp is equal to

A. [Ba2+][SO42-]


B.
C.
D.
E.

4. The Kw of water at 298 K is equal to

A. 1 × 10-7
B. 1 × 10-17
C. 1 × 10-14
D. 1 × 10-1
E.

5. The pH of a solution that has a hydrogen ion concentration of 1 × 10-4 mole/liter is

A. 4
B. -4
C. 10
D. -10
E.

6. The pH of a solution that has a hydroxide ion concentration of 1 × 10-4 mole/liter is

A. 4
B. -4
C. 10
D. -10
E.

7. A small value for K, the equilibrium constant, indicates that

A. the concentration of the un-ionized molecules must be relatively small compared with the ion concentrations
B. the concentration of the ionized molecules must be larger than the ion concentrations
C. the substance ionizes to a large degree
D. the concentration of the un-ionized molecules must be relatively large compared with the ion concentrations
E.

8. In the Haber process for making ammonia, an increase in pressure favors

A. the forward reaction
B. the reverse reaction
C. neither reaction
D.
E.

9. A change in which of these conditions will change the K of an equilibrium given as a starting point?

A. Temperature
B. Pressure
C. Concentration of reactants
D. Concentration of products
E.

10. If Ca(OH)2 is dissolved in a solution of NaOH, its solubility, compared with that in pure water, is

A. increased
B. decreased
C. unaffected
D.
E.

11. When enthalpy is negative and entropy is positive,

A. the free energy is always negative
B. the free energy is negative at lower temperatures
C. the free energy is negative at high temperatures
D. the free energy is never negative
E. the system is at equilibrium, and there is no net reaction

12. When enthalpy is positive and entropy is positive,

A.
B.
C.
D.
E.

13. When enthalpy is negative and entropy is negative,

A.
B.
C.
D.
E.

14. When enthalpy is positive and entropy is negative,

A.
B.
C.
D.
E.

15. When ΔG, free energy, is zero,

A.
B.
C.
D.
E.