Calcium carbonate reacts with dilute hydrochloric acid to produce carbon dioxide gas - Edexcel - GCSE Chemistry Combined Science - Question 2 - 2020 - Paper 1
Question 2
Calcium carbonate reacts with dilute hydrochloric acid to produce carbon dioxide gas.
The rate of reaction between calcium carbonate and dilute hydrochloric acid at... show full transcript
Worked Solution & Example Answer:Calcium carbonate reacts with dilute hydrochloric acid to produce carbon dioxide gas - Edexcel - GCSE Chemistry Combined Science - Question 2 - 2020 - Paper 1
Step 1
State, using the information in Figure 1, the effect of the surface area of the calcium carbonate on the rate of this reaction.
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Answer
The data in Figure 1 shows that smaller pieces of calcium carbonate (powder) produced a greater volume of carbon dioxide (90 cm³) compared to larger pieces (16 cm³). This indicates that an increase in surface area leads to an increase in the rate of reaction, as there is more area for the acid to react with the calcium carbonate.
Step 2
Calculate the average rate of reaction in cm³/s.
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Answer
The average rate of reaction can be calculated using the formula:
extAveragerateofreaction=TimeVolume of gas produced
Here, the volume of carbon dioxide produced is 90 cm³ and the time is 5 minutes, which is equivalent to 300 seconds. Thus,
