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【正文】 AQA and its licensors. All rights reserved. ? C2 2. 4 Q Answer Extra Information Mark (a) Gives out heat or energy 1 (b)(i) Fast initially Slows down Reaction stops Accept qualified answers in terms of volume of gas related to time 1 1 1 (b)(ii) 21 1 (b)(iii) 84 Correct answer with or with working = 2 marks Allow ecf from (b)(ii) correctly calculated for 2 marks Alllow evidence of 21/25 or (b)(ii)/25 for 1 mark 2 (c) Because they/ particles have more energy / move faster ( and so) particles collide more often / more frequently or particle
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