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Rates of reaction

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Question 33

A student investigated the rate of reaction between dilute hydrochloric acid and calcium carbonate. They measured the volume of carbon dioxide gas produced over time. The curve obtained using 5 g of medium-sized marble chips is shown below as line X.

A graph with Volume of carbon dioxide gas in cm³ on the y-axis and Time in seconds on the x-axis. A curve labelled X starts at the origin (0, 0), rises steeply at first, curves to become less steep, and finally levels off horizontally at a volume of 60 cm³ at 100 seconds.

The student repeated the experiment keeping all conditions the same (including temperature, volume, and concentration of the acid) but using 5 g of crushed calcium carbonate powder instead of the medium-sized chips.

Sketch the curve you would expect when the experiment is repeated using the crushed powder. Label your new line Y.

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