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1 markAcids, Bases, Mixtures and Household Chemicals

CSEC Integrated Science · May/June 2012 · Paper 2 · Question 1(b)(ii)

Mr Allen buys muriatic acid (hydrochloric acid) and lye (sodium hydroxide) for outdoor concrete cleaning.

Name ONE piece of safety equipment which Mr Allen should wear when using these cleaners.

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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)(iii)Which of the two common cleaners has a HIGHER pH?[1 mark]
  6. 1(c)(i)Name the chemical process by which the base, calcium carbonate, reacts with excess stomach acid.[1 mark]
  7. 1(c)(ii)Write a simple word equation to express the chemical reaction in (c)(i).[1 mark]
  8. 1(c)(iii)How is the calcium obtained from the antacid used by the body?[1 mark]
  9. 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]
  10. 1(d)(ii)On the grid provided on page 5, plot the data from the table completed in (i) above.[4 marks]
  11. 1(d)(iii)Label the axes on the graph.[1 mark]
  12. 1(d)(iv)State an appropriate title for the graph.[1 mark]
  13. 1(d)(v)Write a statement about the relationship between the height of lather obtained and the hardness of the water.[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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