CSEC Chemistry · January 2010 · Paper 2

50 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.

1. 1(a)(i)2 marksExplain how a salt is formed.
2. 1(a)(ii)2 marksWhat is the difference between 'anhydrous salts' and 'hydrated salts'?
3. 1(a)(iii)2 marksWrite a balanced chemical equation to show the production of the anhydrous salt from the reaction between copper(II) oxide and dilute sulphuric acid.
4. 1(a)(iv)4 marksGiven that the relative formula mass of copper(II) oxide is 80, complete the data in Table 1 by calculating the mass of the salt formed in Experiment 3. (Relative Atomic Mass: Cu = 64; S = 32; O = 16; H = 1) Show your…
5. 1(a)(v)3 marksUsing the data from Table 1 and the axes provided on page 4, plot a graph of the mass of anhydrous salt produced against the mass of copper(II) oxide used.
6. 1(a)(vi)1 markUsing the graph plotted in (v) above, determine the mass of salt that would be formed from 2.95 g of copper(II) oxide.
7. 1(a)(vii)1 markExplain why there is no change in the mass of salt produced for Experiments 4 and 5.
8. 1(b)5 marksComplete Table 2 to show the remaining observations and inferences made by the student.
9. 1(c)3 marksDescribe an appropriate method to produce a pure solid sample of silver chloride starting with silver nitrate solution. (Hint! All silver salts are decomposed by light.)
10. 2(a)(i)2 marksComplete Table 3 by writing in the table, the structure of V and electrical conductivity of Q.
11. 2(a)(ii)1 markState the term used to describe different forms of an element such as the two forms of carbon, V and Q.
12. 2(b)(i)2 marksIdentify the forms of carbon, V and Q.
13. 2(b)(ii)2 marksFigure 1 represents a partially drawn structure of Q. Complete the figure to show the bonding within and between the layers.
14. 2(b)(iii)4 marksState ONE use of Element V and ONE use of Element Q and indicate the property upon which EACH use is based.
15. 2(b)(iv)2 marksExplain why R will conduct electricity when molten but NOT in the solid state.
16. 2(c)2 marksUsing dot cross diagrams, show the bonding in iodine monochloride.
17. 3(a)2 marksDefine the term 'polymer'.
18. 3(b)(i)1 markWhich of the Equations in (b) above shows addition polymerisation?
19. 3(b)(ii)2 marksGive the name of EACH of the polymers shown in Equation 1 and Equation 2.
20. 3(b)(iii)2 marksState ONE use of EACH of the polymers named in (ii) above.
21. 3(c)(i)2 marksWrite a balanced equation for the reaction of ethanoic acid with magnesium metal, Mg (s).
22. 3(c)(ii)1 markWould this reaction take place at room temperature?
23. 3(d)(i)1 markOn the diagram, circle the peptide bond (link) that is found in proteins.
24. 3(d)(ii)2 marksBased on the partial protein structure given above, draw the fully displayed structure of an amino acid that would be produced upon hydrolysis.
25. 3(d)(iii)2 marksState TWO conditions under which proteins can be hydrolysed.
26. 4(a)(i)4 marksState whether or not the bulb will glow for EACH substance. Explain your answer for EACH substance.
27. 4(a)(ii)a)3 marksState which substance causes the bulb to glow more brightly.
28. 4(a)(ii)b)3 marksExplain why the substance you have stated at a) causes the bulb to glow brighter than the other substance.
29. 4(a)(iii)2 marksWrite a balanced ionic equation for the reaction occurring at the cathode for any of the substances in Pair 2.
30. 4(b)(i)1 markGive the name for structure a.
31. 4(b)(ii)2 marksState which of these hydrocarbons are isomers.
32. 4(b)(iii)2 marksWhich TWO hydrocarbons belong to the same homologous series? Give ONE reason for your answer.
33. 4(b)(iv)1 markWrite the general formula of the isomers identified in (iii) above.
34. 5(a)5 marksExplain how the tests above can be used to distinguish among the gases, hydrogen, chlorine and nitrogen. Include observations in your answer.
35. 5(b)(i)4 marksExplain what occurs at the anode and the cathode in the electrolysis of brine.
36. 5(b)(ii)2 marksWrite an ionic equation for the reaction which occurs at the anode.
37. 5(b)(iii)4 marksSuggest why brine is used instead of dilute sodium chloride. Give an equation to justify your answer.
38. 6(a)(i)1 markDescribe the chemical composition of clay.
39. 6(a)(ii)1 markSuggest a possible source of 'glass' in fired clay.
40. 6(a)(iii)2 marksRelate this use of clay to ONE of its properties.
41. 6(b)3 marksFrom your knowledge of the composition of cement and its use in making concrete, explain the reason for the mason's advice.
42. 6(c)(i)4 marksName ONE plant fibre and ONE animal fibre used in making fabric, and state the chemical composition of plant fibres and animal fibres.
43. 6(c)(ii)4 marksSuggest TWO chemical tests which may be used to distinguish an animal fibre from a plant fibre. Include the expected observations.
44. 7(a)4 marksName TWO elements that are essential for plant growth. For EACH of the elements named, identify ONE effect of its deficiency.
45. 7(b)(i)2 marksWrite the names of the type of chemical reactions taking place at A and D.
46. 7(b)(ii)2 marksWrite the name of the formula of compound B.
47. 7(b)(iii)1 markName the type of compound labelled C.
48. 7(c)3 marksSuggest ONE way in which lime can cause nitrogen to be lost from the soil. Include a balanced ionic equation in your answer.
49. 7(d)(i)2 marksState TWO advantages of using hydroponics.
50. 7(d)(ii)1 markSuggest ONE possible limitation of using hydroponics.