17 (i)
What volume of gas is made when the reaction has finished? ........................................... cm3
(ii)
[1]
Calculate the rate of reaction during the first 20 seconds. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... rate of reaction = ...........................................
[2]
(c) Increasing the temperature of the hydrochloric acid increases the rate of the reaction. Use the reacting particle model to explain why. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [3] (d) Breaking the lumps of magnesium into a powder increases the rate of the reaction. Use the reacting particle model to explain why. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [2] [Total: 10]
Š OCR 2013
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