Chemical Changes and Structure
Rates of Reaction NAT 5
Homework One
1.
Which of the following is not an example of a chemical reaction?
A. Ice melting
B. Iron rusting
C. Methane burning
D. Neutralising an acid
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Question 2 and 3 refer to the following diagram. A student set up four
experiments to investigate the solubility of aspirin.
2. Identify the experiment in which the aspirin would take the longest time to
dissolve.
3. Identify the two experiments which would be compared to show the effect
of particle size on the rate of dissolving.
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4. Which of the following pairs of reactants would produce hydrogen the
fastest?
A. Magnesium powder with 4 mol l-1 acid
B. Magnesium ribbon with 2 mol l-1 acid
C. Magnesium powder with 2 mol l-1 acid
D. Magnesium ribbon with 4 mol l-1 acid
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Question 5 and 6 refer to the following diagram. A student set up four
experiments to investigate the solubility of aspirin.
5. Explain, using collision theory, why experiment why experiment E would have
a faster rate of reaction compared to experiment C.
6. Identify the two experiments which could be used to compare the effect of
temperature on the rate of reaction.
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Question 7, 8 and 9 refer to the following diagram. A student set up four
experiments to investigate the solubility of aspirin.
7. Identify the two experiments which could be compared to show the effect
of concentration on the speed of reaction.
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8. Identify the experiment with the fastest rate of reaction.
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9. Identify the experiment with the slowest rate of reaction.
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10. Which of the following diagrams shows the apparatus which would allow a
soluble gas to be removed from a mixture of gases?
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11. When Matthew added the catalyst manganese dioxide to hydrogen
peroxide solution, oxygen gas is produced.
(a)
Mathew wanted to see if raising the temperature to 35˚C would
speed up the reaction. Explain what effect raising the temperature
would have on the reaction.
(b)
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Complete the labelling of the diagram to show how he could make
his second experiment a fair test.
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12. Dilute hydrochloric acid reacts with sodium thiosulphate solution to
produce a precipitate of sulphur.
(a)
State what is meant by a precipitation reaction?
(b)
A pupil investigated the effects of temperature on the speed of
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the reaction. She measured the time taken for enough sulphur to
form to make the cross disappear.
Her results are shown in the table below.
Draw a line graph of the results.
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