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Chemical Kinetics - SS2 Chemistry Past Questions and Answers - page 2

11

What is the rate of Chemical reaction and how can it be measured?

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12

Which of the following factors can affect the rate of a chemical reaction?

A

Temperature

 

B

Concentration of reactants

 

C

Surface area

 

D

All of the above

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13

The rate of a chemical reaction generally increases when:

 

A

Temperature decreases

 

B

Concentration of reactants decreases

 

C

Surface area decreases

 

D

None of the above

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14

Which of the following statements is true about catalysts?

 

A

Catalysts are consumed during a reaction.

 

B

Catalysts lower the activation energy of a reaction.

 

C

Catalysts increase the rate of a reaction.

 

D

All of the above.

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15

The rate of a chemical reaction can be determined by:

 

A

Measuring the change in concentration of reactants over time.

 

B

Observing the colour change of the reaction mixture.

 

C

Measuring the production of gas or heat during the reaction.

 

D

All of the above.

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16

The collision theory of chemical reactions states that:

 

 

A

Reactions can only occur when reactant particles collide with sufficient energy.

 

B

All collisions between reactant particles result in a chemical reaction.

 

C

Temperature has no effect on the rate of a reaction.

D

The rate of a reaction is directly proportional to the concentration of reactants.

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17

The Arrhenius equation relates the rate constant (k) of a reaction to:

 

A

Temperature and activation energy.

 

B

Concentration of reactants.

 

C

Surface area of the reactants.

 

D

Pressure of the reactants.

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18

Which of the following statements is true about exothermic reactions?

 

A

Exothermic reactions release heat to the surroundings.

 

B

Exothermic reactions have higher activation energy than endothermic reactions.

 

C

Exothermic reactions always occur at a fast rate.

 

D

Exothermic reactions always produce gases.

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19

In a reaction that follows first-order kinetics, the rate of the reaction is:

 

A

Directly proportional to the concentration of the reactants.

 

B

Inversely proportional to the concentration of the reactants.

 

C

Independent of the concentration of the reactants.

 

D

Proportional to the square of the concentration of the reactants.

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20

Which of the following is NOT a method to increase the rate of a chemical reaction?

 

A

Increasing the temperature.

 

B

Adding a catalyst.

 

C

Decreasing the concentration of reactants.

 

D

Increasing the surface area of the reactants.

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