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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.
Answer
The results in Figure 1 show that as the size of the calcium carbonate pieces decreases, the volume of carbon dioxide produced increases. This indicates that a greater surface area of the calcium carbonate leads to a faster rate of reaction. Therefore, smaller pieces of calcium carbonate (with larger surface area) react more quickly than larger pieces.
Step 2
Calculate the average rate of reaction in cm³ s⁻¹.
Answer
To calculate the average rate of reaction, use the formula:
Given that the calcium carbonate powder produced 90 cm³ of carbon dioxide in 5 minutes, we first convert time to seconds:
5 minutes = 5 × 60 = 300 seconds.
Now, substituting the values into the formula:
Therefore, the average rate of reaction is 0.3 cm³ s⁻¹.