CSEC Chemistry · May/June 2017 · Paper 2

37 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)5 marksThe rate of the reaction for EACH quantity of catalyst used was calculated and recorded in Table 1. Use the balances shown in Figure 1 on page 5 to complete Table 1.
2. 1(b)1 markDefine the term 'rate of reaction'.
3. 1(c)2 marksWrite a balanced chemical equation to show the decomposition of hydrogen peroxide.
4. 1(d)5 marksUsing the axes in Figure 2 on page 7, plot a graph of rate of reaction versus mass of manganese(IV) oxide from the information in Table 1. One point has already been plotted. Circle the plotted points on the graph, and…
5. 1(e)(i)2 marksUsing your graph, describe the relationship between the rate of reaction and the mass of the catalyst.
6. 1(e)(ii)1 markUsing your graph, determine the rate of reaction using 3.0 g of the catalyst.
7. 1(e)(iii)1 markDetermine the volume of oxygen produced after 10 s using the value obtained from (e) (ii).
8. 1(f)2 marksComplete and label the energy profile diagram in Figure 3 to show how a catalyst affects the rate of reaction.
9. 1(g)4 marksDraw a labelled diagram of the apparatus (including reagents) that was used to conduct the experiment and collect the gas.
10. 1(h)2 marksList TWO other factors which can affect the rate of reaction.
11. 2(a)(i)2 marksDefine EACH of the following terms: Mole; Molar mass.
12. 2(a)(ii)1 markCalculate the mass Lesley would have to weigh to obtain 0.20 moles of aspirin.
13. 2(a)(iii)1 markJared, another student in Lesley's class, weighed 18.0 g of aspirin. Calculate the number of moles of aspirin he weighed.
14. 2(b)3 marksCalculate the mass of ethanoic acid formed when Jared's 18.0 g of aspirin is hydrolysed. [Molar mass of ethanoic acid = 60.0 g mol⁻¹]
15. 2(c)(i)1 markDefine the term 'electrolyte'.
16. 2(c)(ii)2 marksIdentify the ions that are produced from ethanoic acid during electrolysis.
17. 2(c)(iii)1 markDefine the term 'cathode'.
18. 2(c)(iv)1 markPredict which ion from (c) (ii) will migrate to the cathode.
19. 2(c)(v)3 marksIs ethanoic acid a strong or weak electrolyte? Explain your answer.
20. 3(a)(i)1 markState the name and the general formula of the homologous series to which Compound P belongs.
21. 3(a)(ii)1 markState ONE use of Compound P.
22. 3(a)(iii)1 markDefine the term 'structural isomerism'.
23. 3(a)(iv)2 marksDraw the FULLY DISPLAYED structure of ONE isomer of Compound P.
24. 3(b)(i)2 marksExplain why Compound Q is soluble in water.
25. 3(b)(ii)2 marksIs the solution of Compound Q acidic or basic? State a reason for your answer.
26. 3(c)(i)2 marksState the expected colour change for the reaction.
27. 3(c)(ii)2 marksDraw the FULLY DISPLAYED structural formula of Compound S.
28. 4(a)4 marksDefine the term 'salt'. Identify ONE product that EACH of the salts mentioned above is used to manufacture.
29. 4(b)6 marksOutline the laboratory preparation of a pure, dry sample of CaCO₃. Include in your response a balanced chemical equation.
30. 4(c)5 marksWrite a balanced chemical equation with state symbols to illustrate how NaNO₃ can be prepared in the laboratory. Explain why NaNO₃ cannot be prepared utilizing the same method used for the preparation of CaCO₃.
31. 5(a)7 marksDescribe the process of fermentation. Include in your description: the starting material; the role of yeast; the reaction conditions; a balanced chemical equation for the reaction.
32. 5(b)6 marksAfter fermentation, the product is usually filtered and distilled. Suggest why distillation is necessary and draw a simple labelled diagram of the apparatus which can be used for distilling the fermented product in a…
33. 5(c)2 marksIn some countries, the Breathalyzer test is used to determine the level of alcohol on the breath of suspected drunk drivers. Identify the main reagent used in the Breathalyzer test and hence state the type of reaction…
34. 6(a)(i)4 marksArrange the metals A, B and Fe in order of reactivity from LEAST reactive to MOST reactive. Write a balanced chemical equation to show the reaction between metal A and Fe²⁺ ions.
35. 6(a)(ii)5 marksMetal A is placed in a solution of copper(II) sulfate, CuSO₄ (aq). Write an equation for the reaction. State ONE observable change that will occur and explain why this reaction takes place.
36. 6(a)(iii)4 marksFor EACH metal, A and B, state ONE method that can be used to extract it from its respective oxide. Give a reason for EACH answer.
37. 6(b)2 marksMetal alloys are often used for making objects found in our daily lives. Name an alloy of iron and state ONE of its uses.