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Look at the diagram - OCR Gateway - GCSE Chemistry Combined Science - Question 6 - 2019 - Paper 9
Question 6
Look at the diagram. It shows how the reaction between hydrochloric acid and marble chips (calcium carbonate) can be monitored. The reading on the balance decreases... show full transcript
Worked Solution & Example Answer:Look at the diagram - OCR Gateway - GCSE Chemistry Combined Science - Question 6 - 2019 - Paper 9
Step 1
Which statement is the best explanation?
Answer
The best explanation for the decrease in the reading on the balance during the reaction is that carbon dioxide gas is produced when hydrochloric acid reacts with marble chips (calcium carbonate). The chemical reaction can be summarized as follows:
As carbon dioxide gas forms, it escapes from the flask, leading to a decrease in the mass recorded on the balance. Therefore, the correct answer is B.