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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 ac... 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 presented in Figure 10 indicates that smaller pieces of calcium carbonate produce more carbon dioxide gas in the same time period compared to larger pieces. Thus, a larger surface area results in a faster 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 convert the time from minutes to seconds:
5 minutes = 5 × 60 = 300 seconds.
Then we use the formula:
Average Rate of Reaction = Volume of Gas Produced / Time
Substituting the values:
Average Rate of Reaction = 90 cm³ / 300 s = 0.3 cm³ s⁻¹.