A P Chemistry Test (Page 3 of 4) in pdf

A P Chemistry

Chapter 13 Pre-Test

____ 14. Calculate the equilibrium concentration of NO(g).

A) 6.2 × 10

M B) 1.6 × 10

M C) 1.0 M D) 4.0 × 10

M E) 0.50 M

–4

–5

–3

____ 15. Calculate the equilibrium concentration of Cl

(g).

A) 0.50 M B) 6.2 × 10

M C) 1.0 M D) 4.0 × 10

M E) 1.6 × 10

–4

–3

–5

____ 16. Nitrogen gas (N

) reacts with hydrogen gas (H

) to form ammonia (NH

). At 200°C in a closed

container, 1.0 atm of nitrogen gas is mixed with 2.0 atm of hydrogen gas. At equilibrium, the

total pressure is 2.0 atm. Calculate the partial pressure of hydrogen gas at equilbrium.

A) 0.50 atm B) 0.0 atm C) 2.0 atm D) 1.5 atm E) none of these

Use the following to answer questions 17-20:

The questions below refer to the following system:

Cobalt chloride is added to pure water. The Co

ions hydrate. The hydrated form then reacts

with the Cl

ions to set up the equilibrium shown here:

–

____ 17. Which statement below describes the change that the system will undergo if hydrochloric acid is

added?

A) It should become more pink.

D) The equilibrium will shift to the left.

B) Two of these.

E) It should become more blue.

C) The equilibrium will shift to the right.

____ 18. Which statement below describes the change that the system will undergo if water is added?

A) There will be less of the hydrated cobalt ion at the new equilibrium position.

B) The equilibrium will shift to the right.

C) The color will become more blue.

D) More chlorine ions will be produced.

E) More water will be produced.

____ 19. Which statement below describes the change that the system will undergo if silver nitrate is

added?

A) The silver ion will react with the CoCl

. D) Nothing will change.

4 2–

B) It should become more pink.

E) It should become more blue.

C) Water will be produced.

____ 20. Which statement below describes the change that the system will undergo if acetone (whose

density is lower than water and is insoluble in water) is added?

A) The system will become intensely pink in the middle.

B) The system will become intensely blue on the top and clear on the bottom.

C) The system will become blue on the top and pink on the bottom.

D) The system will become intensely pink on the top and clear on the bottom.

E) The system will become pink on the top and blue on the bottom.

March 8, 2001 Page 3

A P Chemistry Test Page 3

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