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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 results in Figure 10 show that as the size of the calcium carbonate pieces decreases, the volume of carbon dioxide produced increases. This indicates that smaller pieces have a larger surface area, resulting in a faster reaction rate.
Step 2
Calculate the average rate of reaction in cm³ s⁻¹:
Answer
To calculate the average rate of reaction, we need to convert the time from minutes to seconds:
- Time taken = 5 minutes = 5 × 60 = 300 seconds
Now we can use the formula for average rate of reaction:
ext{Rate} = rac{ ext{Volume of gas produced}}{ ext{Time taken}}
Substituting the values:
ext{Rate} = rac{90 ext{ cm}³}{300 ext{ s}} = 0.3 ext{ cm}³ ext{s}^{-1}
Therefore, the average rate of reaction is 0.3 cm³ s⁻¹.