1. Version 2.0 Copyright © AQA and its licensors. All rights reserved. C2 2.4 Rates of Reaction

2. Using Exam pro items to support successful outcomes Version 2.0 Copyright © AQA and its licensors. All rights reserved. Learners will be able to test their progress against learning outcomes using questions fro past AQA GCSE examinations. C2 2.4

3. Foundation Tier- June 12, 1 a-c Version 2.0 Copyright © AQA and its licensors. All rights reserved. C2 2.4

4. Version 2.0 Copyright © AQA and its licensors. All rights reserved. C2 2.4

5. Version 2.0 Copyright © AQA and its licensors. All rights reserved. C2 2.4

6. Version 2.0 Copyright © AQA and its licensors. All rights reserved.

7. Mark scheme- Foundation Version 2.0 Copyright © AQA and its licensors. All rights reserved. C2 2. 4 Q AnswerExtra InformationMark (a) Oxygen and water Both needed for mark Allow hydrogen oxide for water In any order Ignore formulae 1 (b) (i)Best fit line, omitting point at 10sStraight line drawn through all correct points 1 (b) (ii)Circle around point at 10sAllow any indication 1 (b) (iii)7.5Allow ecf from your line 1 (b) (iv)Increases ( with time)Accept goes from 0 to 12.5 1 (c) (i)Higher 1 (c) (ii)More concentrated 1 Total 7

8. Higher Tier June 12, 3 Version 2.0 Copyright © AQA and its licensors. All rights reserved. C2 2. 4

9. Version 2.0 Copyright © AQA and its licensors. All rights reserved. C2 2. 4

10. Version 2.0 Copyright © AQA and its licensors. All rights reserved. C2 2. 4

11. Version 2.0 Copyright © AQA and its licensors. All rights reserved. C2 2. 4

12. Mark scheme- Higher Version 2.0 Copyright © AQA and its licensors. All rights reserved. C2 2. 4 QAnswerExtra 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 111111 (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 particles more likely to collide (and) more of the collisions are successful or particles collide with more energy / harder or more of the particles have the activation energy Ignore particles move more /vibrate Ignore collide faster Ignore more collisions Accept more successful collisions 111111 Total 10

13. C2 2. 4