CAPE Chemistry Unit 2 · January 2021 · Paper 2

44 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)3 marksUsing the thermometer readings in Figure 1, on page 5, complete Table 1 by recording the temperatures for the additions of 5 cm³, 15 cm³ and 25 cm³ of H₂SO₄.
2. 1(b)(i)4 marksUsing the axes provided in Figure 2, on page 7, plot the graph of temperature against volume of acid added.
3. 1(b)(ii)2 marksDraw two lines of best fit through the points on the graph, one where the temperature is increasing and the other where the temperature is decreasing.
4. 1(b)(iii)2 marksOn your graph, show the end point of the reaction. Record the corresponding volume below. End point of the reaction = ____ cm³
5. 1(c)2 marksDistinguish between a 'strong acid' and a 'weak acid'.
6. 1(d)2 marksWrite a balanced chemical equation for the reaction between NaOH and H₂SO₄.
7. 1(e)2 marksCalculate the number of moles of H₂SO₄ used in the reaction.
8. 1(f)2 marksCalculate the number of moles of NaOH in 25 cm³ of the solution.
9. 1(g)2 marksCalculate the concentration of NaOH, in mol dm⁻³.
10. 1(h)1 markCalculate the concentration of NaOH, in gdm⁻³, given the molar mass of NaOH = 40 gmol⁻¹.
11. 1(i)2 marksState whether the reaction that took place in the styrofoam cup was exothermic or endothermic. Explain your answer.
12. 1(j)1 markState ONE safety precaution which should have been taken during the experiment.
13. 2(a)(i)1 markDefine the term 'allotrope'.
14. 2(a)(ii)2 marksIdentify the names of R and S.
15. 2(a)(iii)1 markState whether R is an ionic, simple covalent or giant covalent structure.
16. 2(a)(iv)3 marksIn the space below, sketch the structure of R, using solid lines (—) to show strong bonds and dotted lines (••••) to show weak bonds.
17. 2(a)(v)2 marksExplain why R conducts electricity but S does not conduct electricity.
18. 2(b)(i)1 markDeduce the type of bonding present in Solid T.
19. 2(b)(ii)1 markState the appearance that Solid T is expected to have.
20. 2(c)(i)2 marksCompare the arrangement of particles in solids with the arrangement of particles in liquids.
21. 2(c)(ii)2 marksWhen solid iodine is heated, a purple coloured gas is observed. State the process which occurs and give ONE example of another compound which undergoes the same process.
22. 3(a)(i)2 marksDefine the term 'structural isomerism'.
23. 3(a)(ii)2 marksDraw the fully displayed structure of 2-methylbutane.
24. 3(a)(iii)3 marksDraw and name ONE other structural isomer of C₅H₁₂.
25. 3(b)(i)1 markWhat is the functional group of ethanol, CH₃CH₂OH?
26. 3(b)(ii)6 marksTable 2 summarizes the conditions and products of two reactions of ethanol. Complete Table 2 by inserting the reaction conditions and drawing the fully displayed structure of the products which would be formed. Take…
27. 4(a)(i)4 marksComplete Table 3 which shows the three subatomic particles and their properties.
28. 4(a)(ii)5 marksDraw a labelled diagram to illustrate the location, arrangement and number of EACH type of subatomic particle in Element ²⁹₁₄A.
29. 4(b)2 marksCalculate the number of atoms in 80.0 g of calcium. [Relative atomic mass of Ca = 40; Avogadro's constant 6.0 × 10²³]
30. 4(c)(i)3 marksExplain the chemical process that can account for these observations.
31. 4(c)(ii)1 markState ONE other example that demonstrates this process.
32. 5(a)4 marksIdentify the types of reactions numbered 1, 2, 3 and 4 in Figure 3 above.
33. 5(b)(i)2 marksIdentify suitable reagents and reaction conditions which could be used for EACH of the following conversions. Compound A to Compound B via Reaction 1.
34. 5(b)(ii)2 marksIdentify suitable reagents and reaction conditions which could be used for EACH of the following conversions. Compound A to Compound C via Reaction 2.
35. 5(c)(i)1 markGiven that R is an ethyl group, state the molecular formula for Compound A.
36. 5(c)(ii)2 marksHence, write a balanced chemical equation for Reaction 3.
37. 5(d)4 marksDescribe a chemical test that can be used to distinguish Compound A from Compound B.
38. 6(a)(i)2 marksDescribe a test that could be used to identify the gaseous product formed.
39. 6(a)(ii)1 markA sample of the gas was collected in the laboratory by downward delivery. State the physical property of the gas which supports this method of collection.
40. 6(a)(iii)2 marksWrite a chemical equation, including state symbols, for the reaction between hydrochloric acid and sodium hydrogen carbonate.
41. 6(b)2 marksWrite an ionic equation for the reaction of magnesium with dilute hydrochloric acid.
42. 6(c)(i)3 marksExplain why this is NOT a good practice.
43. 6(c)(ii)3 marksPhosphorus and silicon are two other useful non-metals. List TWO uses of silicon and ONE use of phosphorus.
44. 6(c)(iii)2 marksSulfur is a non-metal that burns in air to produce a gas product that dissolves in water to give a colourless solution. Identify the gas formed and state the effect that the solution would have on blue litmus paper.