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8 marksReactions of Carbon Compounds

CSEC Chemistry · May/June 2005 · Paper 2 · Question 1(c)(i)

A group of students synthesizes ethanoic acid (acetic acid) by three different routes in the laboratory, as shown in Figure 2. Route 1 involves one step, Route 2 involves two steps, and Route 3 involves three steps. Plan and design an experiment to determine which route yields the highest percentage of ethanoic acid starting from A. Your answer should include the following: Hypothesis to be tested.

Hypothesis to be tested

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Other parts of this question

  1. 1(a)(i)In the space below, construct a suitable table and record on it, the temperatures at which the reaction took place with the corresponding times in seconds for…[4 marks]
  2. 1(a)(ii)Using the graph paper provided on page 5, plot a graph of temperature versus time in seconds.[3 marks]
  3. 1(a)(iii)What conclusion can be drawn about the rate of the reaction from the graph?[1 mark]
  4. 1(a)(iv)From the graph, determine the time expected to be taken for the appearance of the sulphur precipitate if the reaction were carried out at 50°C. Indicate on…[2 marks]
  5. 1(a)(v)From the information given on page 3 in the introduction to this question, write a balanced chemical equation for the reaction between aqueous sodium…[2 marks]
  6. 1(b)(i)Heat a small portion of solid Y in a test tube, gently at first and then strongly. Observations: colourless gas evolved with a choking odour; turns acidified…[10 marks]
  7. 1(b)(ii)To the remaining portion of solid Y, add 20 cm³ of distilled water, stir to dissolve and filter. Collect the filtrate and divide into three (3) equal portions.…[10 marks]
  8. 1(b)(iii)To the first portion of the filtrate from (b) above, add aqueous sodium hydroxide slowly until in excess. Observations: a green precipitate is formed;…[10 marks]
  9. 1(b)(iv)To the second portion of the filtrate from (b) above, add aqueous silver nitrate followed by aqueous ammonia. Observations: white precipitate is formed;…[10 marks]
  10. 1(b)(v)To the third portion of the filtrate from (b) above, add aqueous barium nitrate followed by aqueous nitric acid. Observations: a white precipitate is formed;…[10 marks]
  11. 1(c)(ii)Materials and apparatus[8 marks]
  12. 1(c)(iii)Method[8 marks]
  13. 1(c)(iv)Variables controlled[8 marks]
  14. 1(c)(v)Data to be collected[8 marks]
  15. 1(c)(vi)Results linked to hypothesis[8 marks]

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