Page 121 - Science Coursebook
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8 End of unit questions
8.3 Bahula investigates the rate of reaction between magnesium and dilute
hydrochloric acid.
dilute acid
marble chips
She measures how much gas is given off every 30 seconds. The graph shows her results.
70
60
50
volume of 40
hydrogen gas
collected / cm 3 30
20
10
0
0 50 100 150 200 250 300 350
time / s
a How long does it take to collect 30 cm of the gas? [1]
3
b How long does it take for the reaction to finish? [1]
c Describe how the rate of reaction changes over the period that the reaction
is taking place. [3]
d Predict what would happen to the rate of the reaction if Bahula increased
the temperature of the acid. [1]
e Explain your answer to d using particle theory. [3]
8 Rates of reaction 119
