Quiz about Topic 6 SL Chemistry Kinetics

Question 1

calcium carbonate is added to hydrochloric acid.

Which graph represents the production of carbon dioxide when excess calcium carbonate is added to the same volume of hydrochloric acid of double concentration?

Accepted Answer

D

Answer

A

Answer

B

Answer

C

Question 2

Which will increase the rate of reaction between calcium carbonate and hydrochloric acid?

I. an increase in temperature

II. an increase in concentration of hydrochloric acid

III. an increase in particle size of calcium carbonate

Accepted Answer

I and II only

Answer

I and III only

Answer

II and III only

Answer

I, II and III

Question 3

Which is the activation energy of the forward reaction?

Accepted Answer

B

Answer

A

Answer

C

Answer

D

Question 4

The same amount of two gases, X and Y, are in two identical containers at the same temperature. What is the difference between the gases?

Accepted Answer

X has the higher molar mass.

Answer

Y has the higher molar mass.

Answer

X has the higher average kinetic energy.

Answer

Y has the higher average kinetic energy.

Question 5

The dotted line represents the formation of oxygen, O₂ (g), from the uncatalysed complete decomposition of hydrogen peroxide, H₂O₂ (aq). Which curve represents a catalysed reaction under the same conditions?

Accepted Answer

B

Answer

A

Answer

C

Answer

D

Question 6

What is the activation energy of the reverse reaction?

Accepted Answer

C

Answer

A

Answer

B

Answer

D

Question 7

What decreases the activation energy of a reaction?

Accepted Answer

Adding a catalyst

Answer

Increasing the temperature

Answer

Adding more reactants

Answer

Increasing collision frequency of reactants

Question 8

Which statements are correct?

I. The activation energy of a reaction is not affected by temperature.

II. A catalyst reduces the enthalpy change of a reaction.

III. Catalysts provide alternative reaction pathways.

Accepted Answer

and III only

Answer

I and II only

Answer

II and III only

Answer

I, II and III

Question 9

Which factors can affect the rate of reaction?

I. Particle size of solid reactant

II. Concentration of reacting solution

III. Pressure of reacting gas

Accepted Answer

I, II and III

Answer

I and II only

Answer

I and III only

Answer

II and III only

Question 10

Excess magnesium powder was added to a beaker containing hydrochloric acid, HCl (aq).

The mass of the beaker and its contents was recorded and plotted against time (line I). Which change could give line II?

Accepted Answer

Using the same volume of more concentrated HCl

Answer

Doubling the mass of powdered Mg

Answer

Using the same mass of Mg ribbon

Answer

Increasing the temperature

Question 11

Which conditions must be met for a reaction to take place?

I. Reactants collide with sufficient energy.

II. Reactants collide with correct orientation.

III. Reactants must be in the same state.

Accepted Answer

I and II only

Answer

I and III only

Answer

II and III only

Answer

I, II and III

Question 12

Which is a correct unit for expressing the rate of a reaction?

Accepted Answer

mol dm^-3 s^-1

Answer

mol dm^-3 s

Answer

mol s

Answer

mol^-1 dm³ s^-1

Question 13

Which quantity can be changed by the use of a catalyst?

Accepted Answer

I and III only

Answer

I and II only

Answer

II and III only

Answer

I, II and III

Question 14

Why does the rate of a reaction increase when the temperature is increased?

I. The activation energy decreases.

II. There are more particles with energy equal to or greater than the activation energy.

III. The frequency of collisions between particles increases.

Accepted Answer

II and III only

Answer

I and II only

Answer

I and III only

Answer

I, II and III

Question 15

Which change increases the rate of a chemical reaction?

Accepted Answer

Increasing the surface area of a solid reactant

Answer

Increasing the size of solid reactant particles

Answer

Decreasing the concentration of aqueous reactants

Answer

Decreasing the pressure of gaseous reactants

Question 16

Which factors can increase the rate of a chemical reaction?

I. Increasing the pressure in gaseous reactions

II. Increasing the temperature in gaseous reactions

III. Increasing the particle size of a solid in a reaction

Accepted Answer

I and II only

Answer

I and III only

Answer

II and III only

Answer

I, II and III

Question 17

Which statement best describes and explains the effect of a catalyst on the rate of a chemical reaction?

Accepted Answer

The rate increases because more colliding particles have the energy needed to react.

Answer

The rate increases because the frequency of collisions between particles increases.

Answer

The rate increases because the activation energy increases.

Answer

The rate increases because more molecules are present.

Question 18

Which statements explain the increase in the rate of a reaction when the temperature is increased?

I. More particles have energy greater than the activation energy.

II. The frequency of collisions increases.

III. The activation energy decreases.

Accepted Answer

I and II only

Answer

I and III only

Answer

II and III only

Answer

I, II and III

Question 19

Which statement about the kinetic theory is not correct?

Accepted Answer

All the particles in water have the same amount of energy at 298 K.

Answer

The particles in ice vibrate about fixed points.

Answer

The particles in steam have more energy than the particles in ice.

Answer

Evaporation of water occurs at all temperatures between 273 K and 373 K when the atmospheric pressure is 101 kPa.

Question 20

Which of the following can increase the rate of a chemical reaction?

I. Increasing the temperature

II. Adding a catalyst

III. Increasing the concentration of reactants

Accepted Answer

I, II and III

Answer

I and II only

Answer

I and III only

Answer

II and III only

Question 21

Hydrochloric acid is reacted with large pieces of calcium carbonate, the reaction is then repeated using calcium carbonate powder. How does this change affect the activation energy and the collision frequency?

Accepted Answer

Activation energy - STAYS CONSTANT ; Collision frequency - INCREASES

Answer

Activation energy - INCREASES ; Collision frequency - INCREASES

Answer

Activation energy - INCREASES ; Collision frequency - STAYS CONSTANT

Answer

Activation energy - STAYS CONSTANT ; Collision frequency - STAYS CONSTANT

Question 22

Which statement is true about using sulfuric acid as a catalyst in this reaction?

I. The catalyst increases the rate of reaction.

II. The catalyst lowers the activation energy for the reaction.

III. The catalyst has been consumed at the end of the chemical reaction.

Accepted Answer

I and II only

Answer

I and III only

Answer

II and III only

Answer

I, II and III

Question 23

What is the best definition of rate of reaction?

Accepted Answer

The increase in concentration of a product per unit time

Answer

The time it takes to use up all the reactants

Answer

The rate at which all the reactants are used up

Answer

The time it takes for one of the reactants to be used up

Topic 6 SL Chemistry Kinetics

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science