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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 indicate that the smaller the size of the calcium carbonate pieces, the greater the volume of carbon dioxide gas produced in five minutes. This suggests that an increased surface area of the calcium carbonate enhances the rate of the reaction. More surface area allows for more collisions between the reactants, leading to a faster reaction.
Step 2
Calculate the average rate of reaction in cm³/s.
Answer
To calculate the average rate of reaction, we can use the formula:
ext{Average Rate of Reaction} = rac{ ext{Volume of gas produced}}{ ext{Time taken}}In this case, the volume of carbon dioxide produced is 90 cm³ and the time taken is 5 minutes.
First, we convert the time into seconds:
5 minutes = 5 × 60 = 300 seconds.
Now we can calculate the average rate:
ext{Average Rate of Reaction} = rac{90 ext{ cm}³}{300 ext{ s}} = 0.3 ext{ cm}³/s.Thus, the average rate of reaction is 0.3 cm³/s.