november 1997 pure chemistry paper
DESCRIPTION
Nov 1997 O Level Paper for practiceTRANSCRIPT
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Quesiton A4
(a) A sample of hydrated copper(II) sulphate, 4 2
5CuSO H O• , was heated in the apparatus
shown below.
On gentle heating, the blur crystal changed in a white solid P and a neutral liquid Q was
collected in the tube cooled by cold water.
Name the white solid P and the neutral liquid Q. [2]
(b) On Stronger heating, the white solid P changed to a black solid R and a gas was evolved
which dissolved in liquid Q to form solution S. The indicator paper turned red as solution S was
formed.
Addition of aqueous barium chloride to solution S gave a white precipitate.
(i) Name the white precipitate
(ii) Give the formulae of the 2 ions present in solution S.
(iii) Name the black solid R. [4]
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(a) Suggest a suitable solution to use an the electrolyte in this cell. (b) Give an equation for the reaction taking place in this cell when zinc is used as the other
electrode.
(c) Explain how the reading on the meter is linked to the position of the metal in the reactivity series.
(d) Complete the table by inserting the names of the metals, aluminium, copper, iron, magnesium and zinc.
Meter reading/V metal
2.72
2.00
1.10
0.78
0.00
Quesiton A6
The Diagram represents a simple cell for the production of electrical energy. One electrode is copper and the other is one of aluminium, copper, iron, magnesium or zinc
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