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

In each of the following you must decide whether it is true or false 1 2 3 4 5 10 6 7 8 9 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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