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3 marksMole Concept

CSEC Chemistry · January 2009 · Paper 2 · Question 4(b)(ii)

During the electrolysis of aqueous copper(II) sulphate with copper electrodes, a current of 3.0 A is passed through the solution for 10 minutes. Copper is deposited at the cathode.

Calculate the mass of copper that is deposited during the reaction. (Relative Atomic Mass: Cu = 64; 1F = 96 500 C)

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  1. 4(a)(i)On page 14, draw a fully labelled generalized diagram to show how the materials provided could be arranged to conduct the experiment in order to determine…[2 marks]
  2. 4(a)(ii)Complete Table 5 to indicate the observations that the students would have made when conducting the experiment.[4 marks]
  3. 4(a)(iii)By referring to the nature of the substances tested, provide a suitable explanation for EACH observation you recorded in (a) (ii) above. Write your answer in…[4 marks]
  4. 4(b)(i)Define the terms 'electrolysis' AND 'cathode'.[2 marks]

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