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5 marksMole Concept

CSEC Chemistry · May/June 2008 · Paper 2 · Question 4(a)(iii)

Barium (Ba) is located below calcium in the same group of the periodic table. The question concerns the electrolysis of molten BaBr₂.

A current of 5A is passed for 2 minutes through the molten BaBr₂. Calculate the mass of the product that will be formed at the cathode. (Relative atomic mass: Ba = 137, Br = 80) (1 Faraday = 96 500 C mol⁻¹)

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  1. 4(a)(i)Draw a fully labelled diagram of the apparatus which could be used in the electrolysis of molten BaBr₂. You should indicate the material from which the…[3 marks]
  2. 4(a)(ii)Write equations to indicate the chemical reactions which occur at the electrodes.[4 marks]
  3. 4(a)(iv)List TWO factors which can in general affect the products formed during electrolysis of compounds.[2 marks]
  4. 4(b)State ONE reason why the reaction of barium with water is faster than the reaction of calcium with water.[1 mark]

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