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3 marksElectrochemistry

CSEC Chemistry · January 2010 · Paper 2 · Question 4(a)(ii)b)

Pair 2 consists of 1 mol dm⁻³ hydrochloric acid and 1 mol dm⁻³ ethanoic acid. The bulb glows for both substances, but glows more brightly for one.

Explain why the substance you have stated at a) causes the bulb to glow brighter than the other substance.

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Other parts of this question

  1. 4(a)(i)State whether or not the bulb will glow for EACH substance. Explain your answer for EACH substance.[4 marks]
  2. 4(a)(ii)a)State which substance causes the bulb to glow more brightly.[3 marks]
  3. 4(a)(iii)Write a balanced ionic equation for the reaction occurring at the cathode for any of the substances in Pair 2.[2 marks]
  4. 4(b)(i)Give the name for structure a.[1 mark]
  5. 4(b)(ii)State which of these hydrocarbons are isomers.[2 marks]
  6. 4(b)(iii)Which TWO hydrocarbons belong to the same homologous series? Give ONE reason for your answer.[2 marks]
  7. 4(b)(iv)Write the general formula of the isomers identified in (iii) above.[1 mark]

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