Version 2.0 Copyright © AQA and its licensors. All rights reserved. C2 2.3.3.(ii) Quantitative Chemistry.

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Version 2.0 Copyright © AQA and its licensors. All rights reserved. C (ii) Quantitative Chemistry

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 from past AQA GCSE examinations. C (ii)

Higher Tier June 12, 6 Version 2.0 Copyright © AQA and its licensors. All rights reserved. C (ii)

Version 2.0 Copyright © AQA and its licensors. All rights reserved. C (ii)

Version 2.0 Copyright © AQA and its licensors. All rights reserved. C (ii)

Mark scheme- Higher Version 2.0 Copyright © AQA and its licensors. All rights reserved. C (ii) QAnswerExtra InformationMark (a)Because calcium is +2 and hydroxide is -1 Or To make the compound neutral (in terms of charges) Accept balance the charges Allow calcium needs to lose 2 electrons and hydroxide needs to gain one electron 1 (b)Particles of size nm Or particles with a few hundred atoms /ions Or particles with a high surface are ( to volume ration) Or as different properties to ‘normal’ size particles of the same substance Allow clear comparison to ‘normal’ size particles 1 (c) Mr CaO = 56 And Mr Ca(OH)2 = 74 2/56 (x74) or (x74) Or 74/56 (x2) or 1.3 (214…) (x2) 2.6(428….) in range 2.6 to 2.96 Allow ecf from step 1 Correct answer with or without working gains 3 marks Allow ecf carried through from step 1 Ignore final rounding to Total5

C (ii)