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1 markAcids, Bases, Mixtures and Household Chemicals

CSEC Integrated Science · May/June 2012 · Paper 2 · Question 1(d)(v)

Myra prepares solutions of magnesium sulphate to simulate hard water of strengths 100%, 80%, 60%, 40%, 20%, and 0% (distilled water) in tubes A to F, adds soap and shakes each.

Write a statement about the relationship between the height of lather obtained and the hardness of the water.

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Other parts of this question

  1. 1(a)(i)Suggest ONE method that can be used to protect the steel windows from rusting.[1 mark]
  2. 1(a)(ii)Give a reason for your answer in (a)(i).[1 mark]
  3. 1(a)(iii)Name TWO factors which may affect the rate of rusting.[2 marks]
  4. 1(b)(i)Suggest TWO possible dangers to Mr Allen when he uses these cleaners.[2 marks]
  5. 1(b)(ii)Name ONE piece of safety equipment which Mr Allen should wear when using these cleaners.[1 mark]
  6. 1(b)(iii)Which of the two common cleaners has a HIGHER pH?[1 mark]
  7. 1(c)(i)Name the chemical process by which the base, calcium carbonate, reacts with excess stomach acid.[1 mark]
  8. 1(c)(ii)Write a simple word equation to express the chemical reaction in (c)(i).[1 mark]
  9. 1(c)(iii)How is the calcium obtained from the antacid used by the body?[1 mark]
  10. 1(d)(i)Read the height of EACH lather column from Figure 1 and record it in the appropriate section of Table 1.[3 marks]
  11. 1(d)(ii)On the grid provided on page 5, plot the data from the table completed in (i) above.[4 marks]
  12. 1(d)(iii)Label the axes on the graph.[1 mark]
  13. 1(d)(iv)State an appropriate title for the graph.[1 mark]
  14. 1(e)(i)Why does water in puddles quickly disappear into the ground on the farm after a shower of rain?[1 mark]
  15. 1(e)(ii)Mr Singh lines a pond with clay to retain water in the dry season. Explain how the clay reduces the amount of water that seeps into the soil in the dry season.[1 mark]
  16. 1(e)(iii)Describe TWO methods that Mr Singh may use to preserve the fertility of the soil on his farm.[2 marks]

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