CAPE Chemistry Unit 2 · May/June 2024 · 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)2 marksDefine the term 'structural isomerism'.
2. 1(a)(ii)3 marksList THREE types of structural isomerism.
3. 1(a)(iii)2 marksDefine ONE of the types of structural isomerism listed in (a) (ii).
4. 1(b)(i)2 marksDraw TWO isomers that have ONE methyl substituent.
5. 1(b)(ii)3 marksDraw THREE isomers that contain ONLY secondary and tertiary carbon atoms and at least TWO methyl substituents.
6. 1(c)(i)5 marksGive the structural formula of Compound A, Compound B and Reagent X.
7. 1(c)(ii)3 marksList the names of the steps involved in going from A to B in Figure 1.
8. 1(c)(iii)2 marksUsing curved arrows, give the mechanism for the first step listed in (c) (ii) on page 6.
9. 1(c)(iv)1 markGive the structural formula of a product that can be formed alternatively to Compound B in (c) (i).
10. 1(c)(v)3 marksGiven that ethanol has a pKa of 16, suggest whether the pKa of Compound C is higher or lower than that of ethanol. Give a reason for your suggestion.
11. 1(c)(vi)2 marksIf the reaction of going from A to B was performed in a closed vessel, what would be the expected colour change?
12. 1(c)(vii)2 marksIn an experiment, two drops of universal indicator were added to 1 cm³ of ethanol in Test tube 1 and 1 cm³ of Compound C in Test tube 2. Suggest the colours expected in Test tubes 1 and 2.
13. 2(a)(i)1 markGive the name of EACH radiation type: A
14. 2(a)(ii)1 markGive the name of EACH radiation type: B
15. 2(a)(iii)1 markGive the name of EACH radiation type: C
16. 2(a)(iv)1 markGive the name of EACH radiation type: D
17. 2(b)(i)3 marksCalculate the wavelength, λ, in metres (m), for this radiation.
18. 2(b)(ii)1 markWith reference to Figure 2, in what radiation band does the calculated wavelength in (b) (i) belong?
19. 2(b)(iii)3 marksA lamp with filament made from the sample emits light of the same wavelength, λ, obtained in (b) (i). Calculate the energy of a single emitted photon.
20. 2(c)(i)1 markState which acid would be appropriate to use in Option 1.
21. 2(c)(ii)3 marksIn the space below, draw the titration curve that would be obtained for Option 1.
22. 2(c)(iii)3 marksIn the space below, draw the titration curve that would be obtained for Option 2.
23. 2(c)(iv)4 marksUsing the information in Table 2 below, select the indicator(s) that cannot be used for the titrations. Option 1. Reason for selection. Option 2. Reason for selection.
24. 2(c)(v)2 marksThe titration results obtained from Option 2 are listed below. Complete the table by filling in the spaces.
25. 2(c)(vi)4 marksGiven that the stock solution of 250 cm³ contained ten tablets, use the information in (c) (v) to calculate the number of milligrams of aspirin contained in a titrated volume of 25.0 cm³ of aspirin (MW = 180.06 g/mol).
26. 2(c)(vii)2 marksThe ingredient table below lists the milligram quantities of aspirin in a single tablet. Based on the findings in (c) (vi), state whether the information in Table 3 is accurate and give a reason for your response.
27. 3(a)5 marksIdentify the species represented by the labels A, B, C and D in Figure 4.
28. 3(b)2 marksUse an equation with state symbols to indicate the process that occurs in Vessel E in Figure 4.
29. 3(c)2 marksUse chemical formula and state symbols to indicate the process that occurs in Vessel F in Figure 4.
30. 3(d)(i)6 marksState Le Chatelier's principle and use it to explain how increases in the pressure of the reactants support the formation of the ammonia product in the Haber-Bosch process.
31. 3(d)(ii)1 markIdentify the unique feature of the starting reactants that is mostly responsible for the exothermic nature of the reaction.
32. 3(d)(iii)3 marksState the reaction conditions that are specific to the Haber-Bosch process.
33. 3(d)(iv)3 marksIndicate how EACH component of the conditions stated in (d) (iii) increases the rate of collisions of reactant molecules.
34. 3(e)2 marksThe Haber-Bosch process generates 2% of the world's CO₂ emissions and consumes 1% of the world's energy. Indicate TWO ways in which CO₂ is emitted as a by-product of the Haber-Bosch process.
35. 3(f)2 marksState the effects of the MAJOR limitations if the reaction in the Haber-Bosch process is done at STP? Effect 1. Effect 2.
36. 3(g)2 marksIdentify TWO ways in which ammonia affects the environment.
37. 3(h)(i)2 marksState the reason for this.
38. 3(h)(ii)2 marksGive the formula for any ONE of the most commonly used ammonium salts in fertilizers.