Sodium Chloride and Solution

2928 WordsSep 6, 201312 Pages
Write your name here Surname Other names Edexcel Certificate Edexcel International GCSE Centre Number Candidate Number Chemistry Unit: KCH0/4CH0 Science (Double Award) KSC0/4SC0 Paper: 1C Monday 21 May 2012 – Morning Time: 2 hours You must have: Calculator Paper Reference KCH0/1C 4CH0/1C KSC0/1C 4SC0/1C Total Marks Instructions Use black ink or ball-point pen. Fill in the boxes at the top of this page with your name, centre number and candidate number. Answer all questions. Answer the questions in the spaces provided – there may be more space than you need. Show all the steps in any calculations and state the units. Information The total mark for this paper is 120. The marks for each question are shown in…show more content…
. . . . . . . . . . . . . . . . . . . . . . (iii) Arrange the five metals in order of reactivity. (3) Most reactive metal . . . . . . . . . . . . . . . . . . ............................................................ . . . . . . . . . . . . . . . . . . ............................................................ . . . . . . . . . . . . . . . . . . ............................................................ . . . . . . . . . . . . . . . . . . ............................................................ Least reactive metal . . . . . . . . . . . . . . . . . . ............................................................ 6 *P40134A0628* (b) Some magnesium powder is added to dilute sulfuric acid in a test tube. A colourless solution is formed and a gas is given off. When more magnesium is added, the reaction continues for a while and then stops, leaving some magnesium powder in the test tube. When a flame is placed at the mouth of the test tube, the gas burns with a squeaky pop. (i) Identify the gas produced. (1) . . . . . . . . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........... ............................................................................................................................... . . . . . . . . . . . . . . . . . . . . . . (ii) Suggest why the
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