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6 (a) Calcium carbonate reacts with dilute hydrochloric acid to produce carbon dioxide gas - Edexcel - GCSE Chemistry Combined Science - Question 6 - 2020 - Paper 1
Question 6
6 (a) Calcium carbonate reacts with dilute hydrochloric acid to produce carbon dioxide gas. The rate of reaction between calcium carbonate and dilute hydrochloric a... show full transcript
Worked Solution & Example Answer:6 (a) Calcium carbonate reacts with dilute hydrochloric acid to produce carbon dioxide gas - Edexcel - GCSE Chemistry Combined Science - Question 6 - 2020 - Paper 1
Step 1
State, using the information in Figure 10, the effect of the surface area of the calcium carbonate on the rate of this reaction.
Answer
The data in Figure 10 indicates that as the size of the calcium carbonate pieces decreases, the volume of carbon dioxide produced increases. This suggests that smaller pieces have a larger surface area which leads to a higher rate of reaction.
Step 2
Calculate the average rate of reaction in cm³·s⁻¹.
Answer
To find the average rate of reaction, we first need to convert the time from minutes to seconds. Since the reaction produced 90 cm³ of carbon dioxide in 5 minutes:
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Convert minutes to seconds:
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Calculate the average rate of reaction: [ \text{Rate} = \frac{\text{Volume of gas}}{\text{Time}} = \frac{90 \text{ cm}³}{300 \text{ s}} = 0.3 \text{ cm}³\cdot \text{s}^{-1} ] Therefore, the average rate of reaction is 0.3 cm³·s⁻¹.