CSEC Chemistry · May/June 2010 · Paper 2

41 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)4 marksIdentify the parts labelled A, B, C, D on the diagram.
2. 1(a)(ii)2 marksWrite a balanced equation to show the decomposition of hydrogen peroxide by manganese(IV) oxide (MnO₂).
3. 1(a)(iii)3 marksUsing the same axes as the graph (Figure 1) on page 3, plot a graph of the volume of oxygen against time using the data in Table 1. The first three points have been plotted for you on the graph.
4. 1(a)(iv)4 marksCompare the plots obtained from Jonathan's and Karen's results in terms of the slope of the graph and the volume of oxygen produced. Account for the differences between Jonathan's and Karen's results.
5. 1(a)(v)a)1 markUsing Karen's graph, determine the volume of oxygen produced in 45 seconds.
6. 1(a)(v)b)2 marksDetermine the number of moles of oxygen produced in 45 seconds at RTP (room temperature and pressure). (1 mole of gas occupies 24 dm³ at RTP: Relative Atomic Mass O = 16)
7. 1(b)5 marksComplete Table 2 by filling in the missing observations and inferences.
8. 1(c)(i)2 marksDraw a CLEARLY labelled diagram of a suitable experimental arrangement for carrying out the investigation in the laboratory.
9. 1(c)(ii)2 marksState TWO variables that should be controlled during the experiment.
10. 2(a)(i)2 marksSodium, magnesium, aluminium, silicon and chlorine are found in the same group in the periodic table. (Give your answer in terms of electron configuration.)
11. 2(a)(ii)4 marksOf the elements magnesium and copper, magnesium will more readily oxidize an aqueous solution of zinc ions than copper will.
12. 2(b)(i)2 marksP reacts with water to produce a solution of its hydroxide and hydrogen gas. Write a balanced equation for the reaction between P and water.
13. 2(b)(ii)2 marksBoth P and Q give similar products when reacted with water. Account for this observation.
14. 2(b)(iii)1 markQ is radioactive. Radioactive substances are widely used in medicine, agriculture and industry. What is meant by the term 'radioactive'?
15. 2(b)(iv)2 marksGive TWO uses of radioactive elements in medicine, agriculture or industry.
16. 2(c)2 marksUsing dot-and-cross diagrams, show the bonding between Q and oxygen. [¹⁶₈O]
17. 3(a)(i)1 markDefine 'structural isomerism'.
18. 3(a)(ii)2 marksDraw fully displayed structures of but-1-ene and but-2-ene.
19. 3(a)(iii)3 marksDraw and name ONE OTHER structural isomer of C₄H₈.
20. 3(a)(iv)1 markState ONE physical property of C₄H₈.
21. 3(b)(i)1 markWhat is meant by a 'functional group'?
22. 3(b)(ii)7 marksComplete Table 3 by identifying the reagents or reaction conditions and drawing the fully displayed structures of the products.
23. 4(a)(i)4 marksIdentify the oxidizing and reducing agents in the equation, and explain your answer.
24. 4(a)(ii)2 marksIron(II) oxide reacts with dilute sulphuric acid to give a pale green solution. Write the equation for the reaction between iron(II) oxide and dilute sulphuric acid.
25. 4(a)(iii)3 marksState whether the reaction in (ii) above is acid-base or redox, and explain your answer.
26. 4(b)(i)2 marksWhat is meant by 'fermentation,' as it relates to the manufacture of rum?
27. 4(b)(ii)2 marksWrite the equation for the fermentation process defined in (i).
28. 4(b)(iii)2 marksSuggest ONE material that could be used to produce wine by fermentation, and give a reason for your suggestion.
29. 5(a)1 markWrite the chemical formula for ONE ore of iron.
30. 5(b)8 marksOutline the steps involved in the extraction of iron from its ore. Write a balanced chemical equation for EACH step.
31. 5(c)2 marksStainless steel, an alloy of iron, is used to make cooking utensils. Suggest TWO reasons why stainless steel is used instead of iron for making cooking utensils.
32. 5(d)1 markBesides cooking utensils, state ONE other use of iron or its alloys.
33. 5(e)3 marksName the compound of iron that is found in the blood and explain how a lack of iron would affect the human body.
34. 6(a)2 marksGive TWO reasons why humans may need to cook their food.
35. 6(b)(i)1 markWhat does egg white look like when it is cooked?
36. 6(b)(ii)1 markWhat is the effect of heat on the protein of the egg?
37. 6(c)(i)1 markSelect the method by which the lamb will take the LONGEST to cook.
38. 6(c)(ii)2 marksOutline the principles involved in the functioning of the pressure cooker.
39. 6(c)(iii)2 marksSuggest TWO benefits of using the pressure cooker in Method 3.
40. 6(c)(iv)4 marksExplain how the pineapple functions in cooking the lamb in Method 2. How does this differ from the use of the pressure cooker in Method 3?
41. 6(c)(v)2 marksExplain how heat affects the Vitamin C in the pineapple.