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Monitoring and controlling chemical reactions answer explanations

Review worked answers and explanations for Monitoring and controlling chemical reactions. Aligned to OCR Gcse Combined Science A Gateway.

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A student investigated the rate of reaction between marble chips (calcium carbonate) and hydrochloric acid. They measured the mass of carbon dioxide gas produced over time. Their results are shown in the graph below. [Graph description: A graph with 'Time (s)' on the x-axis from 0 to 180 and 'Mass of CO2 produced (g)' on the y-axis from 0 to 1.2. The curve starts at (0,0), rises steeply, then gradually flattens out, reaching a horizontal line at approximately 1.0 g CO2 at around 120 seconds.] Using the graph, estimate the time taken for the reaction to produce 0.5 g of carbon dioxide. Give your answer to the nearest 5 seconds. [2 marks]

Monitoring and controlling chemical reactions answers | OCR GCSE Combined Science A Gateway | ExamCompanion