CSEC Chemistry · May/June 2015 · 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)2 marksList TWO natural sources of hydrocarbons.
2. 1(a)(ii)1 markName ONE hydrocarbon, other than wax, that can be used as fuel.
3. 1(b)(i)9 marksUse the readings shown in Figure 2 to complete Table 1.
4. 1(b)(ii)1 markAssuming that the heat absorbed by the conical flask = (mass of the conical flask) × (0.861 J g⁻¹ °C⁻¹) × (temperature change), calculate the heat absorbed by the conical flask used in the experiment.
5. 1(b)(iii)1 markAssuming that the heat absorbed by the water = (mass of water in the conical flask) × (4.2 J g⁻¹ °C⁻¹) × (temperature change), calculate the heat absorbed by the water in the conical flask.
6. 1(b)(iv)1 markCalculate the TOTAL heat absorbed by the calorimeter. Total heat absorbed by the calorimeter = (heat absorbed by the conical flask) + (heat absorbed by water in the conical flask)
7. 1(b)(v)1 markCalculate the heat of combustion of the candle wax. Heat of combustion = (total heat absorbed by the calorimeter) / (mass of candle burnt)
8. 1(b)(vi)1 markWhat was the role of the can in this experiment?
9. 1(c)(i)3 marksComplete Table 2 by inserting the inferences or observations as necessary for the test: Q is heated strongly in a boiling tube. A glowing splint is placed at the mouth of the boiling tube. The gases evolved are bubbled…
10. 1(c)(ii)2 marksComplete Table 2 by inserting the inferences or observations as necessary for the test: Dilute HCl is added in excess to Q and the mixture warmed. To the resulting solution, aqueous NaOH is added until in excess. (Ionic…
11. 1(c)(iii)3 marksComplete Table 2 by inserting the inferences or observations as necessary for the test: Dilute nitric acid followed by a few drops of silver nitrate solution was added to Q. The test tube was left standing in light for…
12. 2(a)(i)1 markList the THREE states of matter in which water exists.
13. 2(a)(ii)3 marksDescribe the strength of the forces of attraction present between the particles in EACH of the three states you have mentioned in (a)(i) above.
14. 2(a)(iii)1 markWhen heated, iodine changes from one state into another. What is this process called?
15. 2(a)(iv)2 marksDescribe how the energy of the iodine particles changes as iodine undergoes the process mentioned in (a)(iii) above.
16. 2(b)4 marksUsing appropriate diagrams, illustrate how the bonding in solid sodium chloride differs from that of diamond.
17. 2(c)4 marksDescribe TWO tests that are performed in the laboratory to distinguish between an 'ionic solid' and a 'molecular solid'. Suggest how the results of the tests described can be used to distinguish between the two solids.
18. 3(a)(i)2 marksName the homologous series to which Compounds A and B belong.
19. 3(a)(ii)2 marksState the name of EACH compound.
20. 3(b)(i)2 marksDefine 'structural isomerism'.
21. 3(b)(ii)4 marksDraw the FULLY DISPLAYED structure of ONE structural isomer for EACH of Compounds A and B.
22. 3(c)(i)1 markDefine the term 'polymer'.
23. 3(c)(ii)1 markIdentify the type of polymerization that is used in the manufacture of polyethene.
24. 3(c)(iii)2 marksState TWO uses of polyethene.
25. 3(c)(iv)1 markState the name of ONE other polymer.
26. 4(a)(i)5 marksDescribe ONE method for the preparation of dry calcium carbonate in the laboratory. In your answer, include an equation for the reaction as well as the steps that are involved in its preparation.
27. 4(a)(ii)1 markThe main ingredient in Epsom salts is magnesium sulfate. List ONE use of Epsom salts.
28. 4(a)(iii)3 marksIn order to effectively use Epsom salts, it is usually made into a solution. Explain why water molecules are able to dissolve Epsom salts.
29. 4(b)6 marksDescribe how permanent hard water is formed. Include balanced chemical equations with state symbols to illustrate this process.
30. 5(a)(i)2 marksIdentify Process P and Process Q.
31. 5(a)(ii)1 markState the importance of the centrifugation process.
32. 5(a)(iii)1 markIdentify Product X.
33. 5(a)(iv)2 marksThe bagasse produced is used in the factory during the processing of sugar cane. In which part of the factory is this bagasse used and what is it used for?
34. 5(b)(i)3 marksOutline, using balanced equations, the formation of ethanol from sucrose.
35. 5(b)(ii)3 marksJemina was presented with a flask that contains a mixture of diluted rum. Draw a labelled diagram of the apparatus she should use in the laboratory to obtain a concentrated sample of ethanol.
36. 5(c)3 marksSuggest the type of reaction that takes place when the magnesium oxide is mixed with the sour wine. Write a balanced chemical equation for this reaction.
37. 6(a)(i)4 marksExplain to Sally why the soap may be producing more scum at Ann's house than at her house.
38. 6(a)(ii)2 marksDo you expect that Sally would get the same result if she uses soapless detergent? State a reason for your answer.
39. 6(b)3 marksOutline the harmful effect that second generation detergents had on the environment.
40. 6(c)(i)2 marksWhat is meant by the term 'Green Chemistry'?
41. 6(c)(ii)4 marksDiscuss TWO benefits of utilizing the principles involved in Green Chemistry.