Chapter 14

What units are used for the rate of reaction?

• It depends on the reaction order.

• M/s

• mol/L

• mol/kg

For the reaction A + 3B -> 2C, how does the rate of disappearance of B compare to the rate of production of C?

• the rate of disappearance of B is 1/2 the rate of appearance of C

• the rate of disappearance of B is 3/2 the rate of appearance of C

• the rate of disappearance of B is 2/3 the rate of appearance of C

• the rate of disappearance of B is 1/3 the rate of appearance of C

What happens to the rate of appearance of a product overtime?

• It increases

• It does not change

• It decreases

• It decreases, and then increases

Which of the following is a negative value?

• The rate of disappearance of a reactant

• The rate of appearance of a product

• The average rate of change

• The rate of change of a reactant

In the combustion of methane, CH 4 (g) + 2 O 2 (g) -> CO 2 (g) + 2 H 2 O (g), which reactant has the greatest rate of disappearance?

• CH4

• O2

• CO2

• H2O

• CH4 and O2 have the same rate of disappearance

A scientist conducts an experiment to determine the rate of the following reaction:

N2 (g) + O2 (g) → 2NO(g)

If the initial concentration of N2 was 0.500 M and the concentration of N2 was 0.450 M after 0.100 s, what is the rate of the reaction?

• 0.500 M/s

• 1.00 M/s

• 5.00 M/s

• 10.0 M/s

• 0.250 M/s

If the rate of appearance of O2 in the reaction:

2O3 (g) -> 3O2 (g)

is 0.250 M/s over the first 5.50 s, how much oxygen (O2) will form during this time?

• 1.38 M

• 4.13 M

• 0.69 M

• 0.25 M

• 0.46 M

If the rate of formation of ammonia is 0.345 M/s, what is the rate of disappearance of N2 ?

N2 (g) + 3 H2 (g) -> 2 NH3 (g)

• 0.173 M/s

• 0.345 M/s

• 0.690 M/s

• 245 M/s

• 0.518 M/s