Collision Theory

Last updated: 05/02/2020

WJEC A-Level Chemistry Unit 2.2 – Rates of reaction Collision Theory

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Question 1 of 20

1. Question
What is the definition of the rate of a reaction?
- The change in concentration of a reactant or a product in a given time
- The change in moles of a reactant or a product in a given time
- The change in volume of a reactant or a product in a given time
- The speed of a reaction
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Question 2 of 20

2. Question
What is the equation for the rate of a reaction?
- Change in concentration / time
- Change in volume / time
- Time x change in concentration
- Time / change in concentration
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Question 3 of 20

3. Question
What are the units for rate of a reaction?
- $mol dm^{-3}s^{-1}$
- mol dm
- $mol dm^3 s^1$
- $mol dm^{-3}$
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Question 4 of 20

4. Question
What is the definition of initial rate?
- The rate at the start of a reaction
- The rate midway through the reaction
- The average rate of reaction
- The rate at the end of a reaction
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Question 5 of 20

5. Question
Using a concentration-time graph, how can the initial rate be found?
- Find the gradient when the time is zero
- Find the gradient
- Find the area under the curve
- Find the gradient when the concentration is zero
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Question 6 of 20

6. Question
How do you calculate a gradient?
- Change on y axis / change on x-axis
- Change on y axis + change on x-axis
- Change on x-axis x change on y axis
- Change on x-axis / change on y-axis
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Question 7 of 20

7. Question
What happens to the gradient within a concentration-time graph for a reactant as a reaction progresses?
- Gets less steep
- Gets steeper
- The gradient stops
- Remains the same
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Question 8 of 20

8. Question
What happens to the gradient within a concentration-time graph for a reactant as a reaction finishes?
- The gradient stops
- Gets steeper
- Remains the same
- Gets less steep
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Question 9 of 20

9. Question
Within a concentration-time graph, which axis does concentration lie on?
- y-axis
- x-axis
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Question 10 of 20

10. Question
Within a concentration-time graph, which axis does time lie on?
- x-axis
- y-axis
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Question 11 of 20

11. Question
When are the concentrations of reactants usually the highest during a reaction?
- Start of a reaction
- They remain constant
- End of a reaction
- Midway through a reaction
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Question 12 of 20

12. Question
When are the concentrations of reactants usually the lowest during a reaction?
- End of a reaction
- They remain constant
- Start of a reaction
- Midway through a reaction
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Question 13 of 20

13. Question
At what point is the rate of a reaction usually the fastest?
- Start of a reaction
- Rate remains constant
- End of a reaction
- Midway through a reaction
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Question 14 of 20

14. Question
What happens to the rate of reaction when the temperature of a reaction is increased?
- Rate increases
- Rate stays the same
- Rate stops
- Rate decreases
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Question 15 of 20

15. Question
What happens to the rate of reaction when the pressure of a reaction with gaseous reactants is increased?
- Rate increases
- Rate stays the same
- Rate stops
- Rate decreases
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Question 16 of 20

16. Question
What happens to the frequencies of collisions between gaseous molecules in a reaction when the pressure is increased?
- Molecules are pushed closer together, therefore the frequency of collisions are increased
- The frequencies of collisions decrease
- Molecules move further away from one another, therefore the frequency of collisions are decreased
- The frequencies of collisions remain the same
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Question 17 of 20

17. Question
What happens to the rate of reaction when the concentration of a reaction is increased?
- Rate increases
- Rate stays the same
- Rate stops
- Rate decreases
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Question 18 of 20

18. Question
What happens to the frequencies of collisions between molecules in a reaction when the concentration is increased?
- Molecules are closer together, increasing the chance of collisions with energy to overcome the activation energy. Therefore the frequency of collisions will increase.
- Molecules are further away, reducing the change of collisions. Therefore the frequency of collisions will decrease.
- The frequencies of collisions decrease
- The frequencies of collisions remain the same
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Question 19 of 20

19. Question
What happens to the rate of reaction when the surface area of a reaction is increased?
- Rate increases
- Rate stays the same
- Rate stops
- Rate decreases
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Question 20 of 20

20. Question
What happens to the rate of reaction when a catalyst is added to a reaction?
- Rate increases
- Rate stays the same
- Rate stops
- Rate decreases
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