Sodium Chloride and Solution Essay

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Essay Sample
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

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(c) The student obtained the following results. mass of basin and salt (step E) = 81.50 g mass of empty basin (step A) = 78.60 g

Calculate the mass of salt dissolved in 100 cm3 of sea water. (1)

Mass of salt = .................................... . . . . . . . . . . . . . . . . g (Total for Question 1 = 9 marks)

*P40134A0528*

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2 The diagrams show the reactions of some metals with cold water and with dilute hydrochloric acid. bubbles of gas

Metals in cold water calcium copper iron magnesium zinc

Metals in dilute hydrochloric acid calcium copper iron magnesium zinc

(a) Answer the following questions, using only the metals that appear in the diagrams. (i) Name two metals that react with cold water. (2)
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and ............................................................................................................... . . . . . . . . . . . . . . . . . . . . .

(ii) Name one metal that reacts with dilute hydrochloric acid but not with cold water. (1)
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