Unit 7 Test Equilibrium Relearning - Weebly

[Pages:2]Name: _________________________ Hr: _____

College Chemistry Equilibrium Unit Test: Relearning

Instructions: Complete these practice problems using your notes, worksheets, textbook, and classmates to help you. When you are done with the problems, set up a time to correct your test with your teacher.

1. At equilibrium: a. all reactions have ceased. b. only the forward reaction continues. c. both the forward and reverse reactions continue.

2. At equilibrium: a. the forward reaction rate is lower than the reverse reaction rate. b. the forward reaction rate is higher than the reverse reaction rate. c. the forward reaction rate is equal to the reverse reaction rate.

3. At equilibrium, the total amount of the product(s) a. may be equal to, greater than, or less than the total amount of the reactants. b. is always greater than the total amount of the reactants. c. is always equal to the total amount of the reactants.

4. A very low value of Keq indicates that a. equilibrium is reached slowly. b. products are favored. c. reactants are favored. d. equilibrium has been reached.

5.

The

equilibrium

constant

Keq

depends

on

changes

in

a. pressure.

b. concentrations.

c. temperature.

d. pressure, concentrations, and temperature.

6. What is the chemical equilibrium expression for the equation 2A2 B + 3CD A4 D + C3 B2?

7. An equilibrium mixture of SO2, O2 , and SO3 gases at 1500 K is determined to consist of 0.344 mol/L SO2, 0.172 mol/L O2, and 0.56 mol/L SO3 . What is the equilibrium constant for the system at this temperature? The balanced equation for this reaction is 2SO2 (g) + O2(g) 2SO3(g). a. 0.41

b. 2.8

c. 6.7

d. 0.15

8. If the system 2CO(g) + O2 (g) 2CO2 (g) has come to equilibrium and then more CO(g) is added, a. [CO2] increases and [O2] decreases. b. [CO2] increases and [O2] increases. c. [CO2] decreases and [O2] decreases. d. both [CO2 ] and [O2 ] remain the same.

9.

If

the

pressure

on

the

equilibrium

system

2CO(g)

+

O2 (g)

2CO2 (g)

is

increased,

a. the quantity of CO(g) increases.

b. the quantity of CO2( g) decreases. c. the quantity of CO2 ( g) increases. d. the quantities in the system do not change.

10. If the temperature of the equilibrium system CH3OH(g) + 101 kJ CO(g) + 2H2 (g) increases, a. [CH3OH] increases and [CO] decreases. b. [CH3 OH] decreases and [CO] increases. c. [CH3 OH] increases and [CO] increases. d. the concentrations in the system do not change.

11. If the temperature of the equilibrium system CH3OH(g) + 101 kJ CO(g) + 2H2 (g), K eq a. increases. b. decreases. c. increases or decreases. d. does not change.

12.

If

more

CO(g)

is

added

to

the

system

2CO(g)

+

O2 (g)

2CO2(g)

at

constant

temperature,

K

a. increases.

b. decreases.

c. increases or decreases.

d. does not change.

13. If the temperature of the equilibrium system X + Y XY + 25 kJ decreases, a. [X] decreases and [XY] increases. b. [X] increases and [XY] decreases. c. [X] decreases and [XY] decreases.

 ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download