CSEC Chemistry · May/June 2016 · 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.

1. 1(a)(i)4 marksComplete Table 1 by inserting the thermometer readings from Figure 2 (page 5) at the appropriate times.
2. 1(a)(ii)5 marksUsing the data from Table 1, plot the graph of temperature versus time on the grid provided in Figure 3 on page 7. Five points have already been plotted for you. Draw a smooth curve through the points to complete the…
3. 1(a)(iii)1 markList the THREE states of matter.
4. 1(a)(iv)2 marksDefine the term 'melting point'.
5. 1(a)(v)1 markBased on information from the graph plotted in (a) (ii), state the melting point of A.
6. 1(a)(vi)1 markFrom the graph plotted in (a) (ii), identify the time range during which there should be a mixture of liquid and solid in the boiling tube.
7. 1(a)(vii)1 markState ONE precaution, other than wearing safety apparel, which should be taken during this experiment to avoid injury to the face or hands.
8. 1(a)(viii)2 marksComplete Figure 4 by drawing the arrangement of the particles of A at 0 min and 10 min. Use • (one dot) to represent a particle.
9. 1(b)8 marksComplete Table 2 by inserting the appropriate inferences.
10. 2(a)2 marksDistinguish between an 'oxidizing agent' and a 'reducing agent' in terms of electron gain or loss.
11. 2(b)(i)1 markState an oxidizing agent that is NOT mentioned in Table 3.
12. 2(b)(ii)2 marksIdentify whether Solution C is acting as an oxidizing or reducing agent in Test 1 and Test 2.
13. 2(b)(iii)4 marksWith reference to oxidation states, explain EACH of your answers in (b) (ii).
14. 2(b)(iv)2 marksWrite an ionic equation (with state symbols) for the reaction which took place in Test 3.
15. 2(b)(v)4 marksWith reference to the electrochemical series, explain the difference in observations between Tests 3 and 4.
16. 3(a)2 marksDefine the term 'structural isomerism'.
17. 3(b)(i)1 markState the name of Compound P.
18. 3(b)(ii)1 markState ONE physical property of Compound P.
19. 3(b)(iii)1 markState ONE chemical property of Compound P.
20. 3(b)(iv)4 marksDraw the FULLY DISPLAYED structural formulae of Compound P and ONE of its isomers.
21. 3(c)(i)2 marksDraw the FULLY DISPLAYED structure of ONE BRANCHED isomer of Compound Q.
22. 3(c)(ii)1 markState ONE physical property of Compound Q.
23. 3(d)1 markState the name of Compound R.
24. 3(e)2 marksState the conditions required for the dehydration of ethanol.
25. 4(a)6 marksGraphite and diamond are two allotropes of carbon. Define the term 'allotrope'. Illustrate your answer by drawing the lattice structures for both diamond and graphite.
26. 4(b)(i)2 marksDescribe the bonding present in metals.
27. 4(b)(ii)2 marksExplain, in terms of bonding, why graphite conducts electricity but diamond does NOT conduct electricity.
28. 4(c)5 marksSodium chloride and calcium oxide both have similar giant ionic crystalline structures with high melting points. However, the melting point of calcium oxide is higher than that of sodium chloride. Sketch the lattice…
29. 5(a)3 marksIdentify the type of bonding present in methane. State a reason for your answer.
30. 5(b)(i)2 marksWrite a balanced equation for this reaction.
31. 5(b)(ii)2 marksState the type of reaction taking place and identify the reaction conditions.
32. 5(c)4 marksIdentify and draw the structural formulae of the alkene and the acid from the list of molecular formulae given below: C₄H₈, C₄H₁₀, C₄H₈O₂, C₄H₁₀O.
33. 5(d)(i)2 marksAn alkane and an alkene
34. 5(d)(ii)2 marksAn alkane and a carboxylic acid.
35. 6(a)(i)5 marksBriefly describe the extraction of aluminium from its named ore. Include in your description ONE ionic equation.
36. 6(a)(ii)2 marksAlthough aluminium ore is mined in the Caribbean, the extraction of aluminium usually takes place in other countries. Suggest ONE reason why it may be difficult to extract aluminium in the Caribbean.
37. 6(b)5 marksIdentify this alloy and suggest why it is better to use it, rather than the pure metal, in the manufacture of aircraft.
38. 6(c)3 marks"Some metals can be useful to man but yet harmful to the environment." Comment on this statement with reference to mercury.