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CSEC Chemistry · January 2013 · Paper 2

38 questions and parts from this paper. Open one to see it in full, then practise it on Quelpr and get it marked against the mark scheme.

Practise this paper
  1. 1(a)1 markDefine the term 'rate of reaction'.
  2. 1(b)3 marksRead, from the diagrams in Figure 1 and record in Table 1, the volume of the gas produced for EACH experiment. Experiment 1 has been done for you.
  3. 1(c)(i)2 marksWrite a balanced chemical equation, including state symbols, for the reaction between zinc metal and dilute hydrochloric acid.
  4. 1(c)(ii)2 marksIdentify the oxidizing agent in the equation in (c) (i), and give a reason, in terms of oxidation numbers, why the agent is oxidizing.
  5. 1(c)(iii)3 marksCalculate the maximum volume of hydrogen gas, at room temperature and pressure (RTP), that would be produced when 1.0 gram of zinc metal reacts with excess dilute hydrochloric acid. (1 mole of a gas occupies 24 dm³ at…
  6. 1(d)6 marksCompare the volume of gas produced in Experiments 2, 3 and 4, to the volume produced in Experiment 1, and give an explanation in EACH case.
  7. 1(e)(i)1 markWith which granules, zinc or magnesium, will Experiment 1 be more reactive?
  8. 1(e)(ii)1 markUsing the same axes in Figure 2, sketch the curve when magnesium granules are used in Experiment 1.
  9. 1(f)(i)4 marksAn outline of the steps for a procedure you can use
  10. 1(f)(ii)2 marksA list of the main observations that would be expected at EACH stage of the experiment
  11. 2(a)(i)1 markState the name of the process being used in Figure 3 to separate the iodine from sodium chloride.
  12. 2(a)(ii)3 marksDescribe what should be observed when the sample of NaCl and I₂ is heated.
  13. 2(a)(iii)3 marksUsing dot cross diagrams, show the bonding in NaCl.
  14. 2(a)(iv)4 marksBy comparing the forces of attraction between the NaCl particles and the I₂ molecules, explain why gentle heating is suitable for separating I₂ from a mixture of NaCl and I₂.
  15. 2(b)(i)1 markState whether the method outlined in Figure 3 is suitable for separating the Fe from NaCl.
  16. 2(b)(ii)3 marksWith reference to the bonding in Fe, explain your answer to (b) (i).
  17. 3(a)(i)4 marksDraw the FULLY DISPLAYED structures and state the names of BOTH compounds.
  18. 3(a)(ii)1 markState whether Compound A burns in air with a sooty flame or a clean, blue flame.
  19. 3(a)(iii)2 marksWrite a balanced chemical equation for this reaction.
  20. 3(b)(i)2 marksExplain why Compound C is soluble in water and Compound D is not.
  21. 3(b)(ii)2 marksWrite a balanced equation for the chemical reaction of Compound C with calcium metal.
  22. 3(c)(i)1 markWhat is a polymer?
  23. 3(c)(ii)a)1 markWhat type of polymerization has taken place?
  24. 3(c)(ii)b)1 markWhat is the name of the product that is formed in (ii) a)?
  25. 3(c)(ii)c)1 markState ONE use of the product formed in (ii) a).
  26. 4(a)4 marksExplain why magnesium conducts electricity when solid but magnesium iodide (MgI₂) only conducts electricity when molten or in solution.
  27. 4(b)(i)2 marksDraw a labelled diagram of apparatus which could be used in the electrolysis of molten MgI₂.
  28. 4(b)(ii)4 marksWrite equations to indicate the chemical reactions which will occur at EACH electrode.
  29. 4(c)5 marksA current of 5 A is passed for 10 minutes through the molten MgI₂. Calculate the mass of product that will be formed at the cathode. (Relative atomic masses: Mg = 24; I = 127) (1 Faraday = 96 500 C mol⁻¹)
  30. 5(a)(i)2 marksOutline how processes X and Y move carbon through the cycle.
  31. 5(a)(ii)5 marksDescribe the process occurring at Z and explain ONE harmful effect that could occur as a result of this process. Write ONE balanced equation to support your answer.
  32. 5(b)(i)a)2 marksWrite a suitable equation for the action of heat on the carbonate of R
  33. 5(b)(i)b)2 marksWrite a suitable equation for the reaction between M and aqueous aluminium ions.
  34. 5(b)(ii)2 marksExplain why M is more reactive with dilute acid than R.
  35. 5(b)(iii)2 marksState ONE physical and ONE chemical property that both M and R are likely to share.
  36. 6(a)(i)2 marksIdentify a possible source for EACH of them.
  37. 6(a)(ii)4 marksExplain how the environment is affected by EACH pollutant.
  38. 6(b)9 marksThe use of landfills, incinerators and recycling are three major methods used for solid waste disposal. Discuss the advantages and disadvantages of using these THREE methods in the Caribbean. For EACH method, identify…

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