1. Section 1 – Controlling the Rate of Reaction
CfE Higher Chemistry
Section 1 – Controlling the Rate of Reaction

2. In each of the following you must decide whether it is true or false1 2 3 4 5 10 6 7 8 9 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

3. Question 1
For a fixed change in concentration of a reactant, the shorter the time taken, the faster the rate of reaction.
True
False

4. The unit for average rate of reaction could be mol l-1 s-1
Question 2
The unit for average rate of reaction could be mol l-1 s-1
True
False

5. Question 3
The rate of reaction is likely to be fastest nearer the end of the reaction.
True
False

6. The unit for average rate of reaction could be mol l-1
Question 4
The unit for average rate of reaction could be mol l-1
True
False

7. Question 5
For some reactions the reaction rate can double for every temperature rise of ten centigrade degrees
True
False

8. The unit for average rate of reaction could be cm3 s-1
Question 6
The unit for average rate of reaction could be cm3 s-1
True
False

9. Increasing the temperature increases the rate of reaction
Question 7
Increasing the temperature increases the rate of reaction
True
False

10. A dilute acid usually reacts faster than a concentrated acid
Question 8
A dilute acid usually reacts faster than a concentrated acid
True
False

11. Question 9
Lumps of calcium carbonate react faster with acid than calcium carbonate powder
True
False

12. Milk is more likely to turn sour at 0C than 10C
Question 10
Milk is more likely to turn sour at 0C than 10C
True
False

13. Small potatoes take longer to cook than large potatoes
Question 11
Small potatoes take longer to cook than large potatoes
True
False

14. Plants grow faster in warm weather than in cold weather
Question 12
Plants grow faster in warm weather than in cold weather
True
False

15. Compared with coal dust, lumps of coal burn very rapidly
Question 13
Compared with coal dust, lumps of coal burn very rapidly
True
False

16. Acetylene burns less rapidly in pure oxygen than in air
Question 14
Acetylene burns less rapidly in pure oxygen than in air
True
False

17. Chips cook faster in oil at 300C than in oil at 200C
Question 15
Chips cook faster in oil at 300C than in oil at 200C
True
False

18. Reactions involving gases go faster when the pressure is increased
Question 16
Reactions involving gases go faster when the pressure is increased
True
False

19. A catalyst can speed up the rate of reaction
Question 17
A catalyst can speed up the rate of reaction
True
False

20. Question 18
The rate of reaction is decreased when you decrease the surface area of the reactant particles
False
True

21. Question 19
A catalyst can be recovered chemically unchanged at the end of a reaction
True
False

22. Question 20
With some chemical reactions, light can be used to increase the number of particles with energy greater than the activation energy
False
True

23. Question 21
The collision theory can be used to explain the effects of temperature on the kinetic energy of particles
True
False

24. Question 22
The effect of temperature on reaction rates can be explained in terms of an increase in the number of particles with energy greater than the activation energy
True
False

25. Question 23
The activation energy is the minimum kinetic energy required by colliding particles before a reaction will occur
True
False

26. Question 24
The collision theory cannot be used to explain the effects of concentration on reaction rates
True
False

27. Question 25
A catalyst speeds up the rate of reaction by increasing the activation energy
True
False

28. Well Done!!
Correct!

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