K-1 Basics of Kinetics

Question 1

Will the following increase, decrease, or have no impact on the rate of reaction?

increase the temperature of the reaction

Answer 1

increase the rate

Question 2

Will the following increase, decrease, or have no impact on the rate of reaction?

increase the molar concentration of the reactants

Answer 2

increase the rate

Question 3

Will the following increase, decrease, or have no impact on the rate of reaction?

Increase the surface area of a solid

Answer 3

increase the rate

Question 4

Will the following increase, decrease, or have no impact on the rate of reaction?

Reduce the temperature of a reaction

Answer 4

decrease the rate

Question 5

Will the following increase, decrease, or have no impact on the rate of reaction?

Add a catalyst to a reaction

Answer 5

increase the rate

Question 6

Will the following increase, decrease, or have no impact on the rate of reaction?

increase the molar concentration of all reactants

Answer 6

increase the rate

Question 7

Will the following increase, decrease, or have no impact on the rate of reaction?

Decrease the concentration of all reactants

Answer 7

decrease the rate

Question 8

Will the following increase, decrease, or have no impact on the rate of reaction?

Decrease the partial pressure of a particluar gaseous reactant

Answer 8

decrease the rate

Question 9

Will the following increase, decrease, or have no impact on the rate of reaction?

Decrease the partial pressure of a particluar gaseous reactant

Answer 9

decrease the rate

Question 10

Will the following increase, decrease, or have no impact on the rate of reaction?

A 5 gram piece of zinc metal is digested in 10 mL of 1 M hydrochloric acid (HCl). The reaction produces hydrogen gas. What happens to the rate of the reaction if I use 10 mL of 2 M HCl?

Answer 10

increase the rate of hydrogen gas production

Question 11

Will the following increase, decrease, or have no impact on the rate of reaction?

A 5 gram piece of zinc metal is digested in 10 mL of 1 M hydrochloric acid (HCl). The reaction produces hydrogen gas. What happens to the rate of the reaction if I use 20 mL of 1 M HCl?

Answer 11

No change in the rate of hydrogen gas production since there is no change in the concentration of the HCl.

Question 12

Will the following increase, decrease, or have no impact on the rate of reaction?

A 5 gram piece of zinc metal is digested in 10 mL of 1 M hydrochloric acid (HCl). The reaction produces hydrogen gas. What happens to the rate of the reaction if I use a 10 gram piece of zinc metal 10 mL of 1 M HCl?

Answer 12

No change in the rate of hydrogen gas production since zinc is a solid and does not have a concentration. Note: There could be a small change in surface area that could have an impact but it would be minor.

Question 13

Will the following increase, decrease, or have no impact on the rate of reaction?

A 5 gram piece of zinc metal is digested in 10 mL of 1 M hydrochloric acid (HCl). The reaction produces hydrogen gas. What happens to the rate of the reaction if I use 10 grams of powdered zinc in 10 mL of 1 M HCl?

Answer 13

Increase in the rate of hydrogen gas production due to an increase in surface area.

Question 14

Will the following increase, decrease, or have no impact on the rate of reaction?

A 5 gram piece of zinc metal is digested in 10 mL of 1 M hydrochloric acid (HCl) at room temperature. The reaction produces hydrogen gas. What happens to the rate of the reaction if I place the reaction mixture on ice?

Answer 14

Decrease in the rate of hydrogen gas production due to a a decrease in reaction temperature.

Question 15

Will the following increase, decrease, or have no impact on the rate of reaction?

Nitrogen dioxide gas is added to a flask until a pressure of 1 atm is achieved. A small amount of granular platinum is added to flask. The platinum is not consumed in the reaction.

2 NO₂ (g) ⇒ N₂ (g) + 2 O₂ (g)

Answer 15

Increase in the rate of nitrogen gas production due to the addition of the platinum catalyst.

Question 16

List 4 things that will increase the rate of consumption of the acetone (C₃H₆O)

C₃H₆O (l) + 4 O₂ (g) ⇒ 3 CO₂ (g) + 3 H₂O (g)

Answer 16

• increase the pressure of the oxygen gas
• atomize the liquid C₃H₆O (make it a fine spray)
• raise the temperature of the reaction
• find and add a catalyst

Question 17

What do you need to measure in order to determine the rate of a reaction?

Answer 17

1. Change in concentration of a reactant or a product.
2. Amount of time needed to achieve that change.

Question 18

Write a rate expression for the consumption of oxygen

C₃H₆O (l) + 4 O₂ (g) ⇒ 3 CO₂ (g) + 3 H₂O (g)

Answer 18

Question 19

Write a rate expression for the production of carbon dioxide.

C₃H₆O (l) + 4 O₂ (g) ⇒ 3 CO₂ (g) + 3 H₂O (g)

Answer 19

Question 20

Write a rate expression for the production of water.

C₃H₆O (l) + 4 O₂ (g) ⇒ 3 CO₂ (g) + 3 H₂O (g)

Answer 20

Question 21

Which of the following distrubutions represents the gas with the greatest temperature?

Answer 21

T2

Question 22

Which of the following distrubutions represents the gas with the greatest number of particles?

Answer 22

They are the same since they have the same area under the curve (approximately)

Question 23

Which of the following distributions represents the gas with the lower pressure?

Answer 23

Substance 2

Question 24

Which of the following distributions represents the gas with the lower temperature?

Answer 24

Neither since both have about the same average KE - just past the midpoint of the peak.