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2 marksEnergetics

CSEC Chemistry · January 2007 · Paper 2 · Question 1(c)(v)

Kerosene and methylated spirit are fuels used in lamps. Their combustion produces heat. The heat of combustion can be determined experimentally by heating water. Plan an experiment to test the hypothesis: Methylated spirit and kerosene produce the same amount of energy on combustion.

TWO possible sources of error in your experiment:

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Other parts of this question

  1. 1(a)(i)Using the graph paper provided on page 3, plot the data for the solubility of R and T given in Table 1.[4 marks]
  2. 1(a)(ii)Describe the effect of increasing temperature on the solubilities of R and T.[1 mark]
  3. 1(a)(iii)Determine the temperature at which the solubilities of R and T are equal.[1 mark]
  4. 1(a)(iv)Determine the solubility of T at 75°C.[1 mark]
  5. 1(a)(v)Which of the two salts is more soluble at 5°C?[1 mark]
  6. 1(a)(vi)Suggest a way for obtaining an essentially pure sample of R from a sample which has been contaminated with a small amount of T.[3 marks]
  7. 1(b)(i)Complete Table 2 below by writing the inferences for tests carried out on Solid W. Test: A sample of Solid W is moistened with sodium hydroxide solution and…[1 mark]
  8. 1(b)(ii)Complete Table 2 below by writing the inferences for tests carried out on Solid W. Test: To an aqueous solution of W, a few drops of acidified silver nitrate…[2 marks]
  9. 1(b)(iii)Complete Table 2 below by writing the inferences for tests carried out on Solid W. Test: To an aqueous solution of W, a solution containing barium ions is…[3 marks]
  10. 1(b)(iv)Complete Table 2 below by writing the inferences for tests carried out on Solid W. Test: Dilute hydrochloric acid is added to the mixture from (iii) above.…[2 marks]
  11. 1(c)(i)Procedure:[2 marks]
  12. 1(c)(ii)Draw a fully labelled diagram of the apparatus required to conduct your experiment.[3 marks]
  13. 1(c)(iii)Data to be collected:[2 marks]
  14. 1(c)(iv)SAMPLE calculation to be performed to determine the heat of combustion per mole of the fuel:[2 marks]

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