Chemical Changes and Structure1.2 Rate of ReactionHomework Two - A

1. A student set up four experiments to investigate the solubility of aspirin.

(a) Identify the experiment in which the aspirin would take the longest time to dissolve.

(b) Identify the two experiments which would be compared to show the effect of particle size on the speed of dissolving

2. A teacher set up some experiments to investigate the dyeing of cloth.

(a) Identify the two experiments carried out under neutral conditions.

(b) Identify the two experiments which could be compared to show the effect of pH on the dyeing of cloth.

3. Two students investigated the reaction between magnesium and dilute hydrochloric acid.

(a) Identify the two experiments which could be compared to show the effect of concentration on the speed of reaction.

(b) Identify the experiment with the fastest speed of reaction.

4. Lesley and Scott studied the reaction of magnesium with dilute acid. The same mass of magnesium was used in each experiment

Identify the two experiments which could be used to show the effect of temperature on the rate of the reaction.

5. Manganese dioxide acts as a catalyst in the following reaction:

Hydrogen peroxide water + oxygen

The diagram shows how the reaction can be carried out.

Several experiments were carried out using the same mass of manganese dioxide and the same volume of hydrogen perioxide solution.

(a) Identify the two experiments which should be compared to show the effect of particle size on the speed of reaction.

(b) Identify the experiment with the slowest speed of reaction.

6. Zinc reacts with dilute sulphuric acid.

List the factors which will speed up this reaction.

7. A student investigated the reaction between marble chips and excess dilute hydrochloric acid.

Which of the following will not increase the rate of this reaction?

A. Increasing the volume of the acidB. Decreasing the size of the marble chipsC. Decreasing the concentration of the acidD. Increasing the temperature of the acid

8. Which of the following pairs of reactants would produce hydrogen more slowly.

A. Magnesium powder with 4 moll-1 acidB. Magnesium ribbon with 2 moll-1 acidC. Magnesium powder with 2 moll-1 acidD. Magnesium ribbon with 4 moll-1 acid

9. A student carried out several experiments with metals and acids.

Identify the two experiments which should be compared to show the effect of particle size on the speed of reaction.

10. Zinc and magnesium both react with hydrochloric acid.

(a) Identify the experiment with the slowest rate of reaction.

(b) Identify the two experiments which could be used to compare the effect of temperature on the rate of reaction.

11. A pupil carried out the following experiments.

(a) Identify the two experiments which could be used to compare the effect of concentration on the rate of reaction.

(b) Identify the experiment with the fastest reaction rate.