CAPE Chemistry Unit 2 · May/June 2025 · 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)(i)2 marksName EACH of the following compounds in Figure 1. Compound A, Compound B.
2. 1(a)(ii)2 marksDefine the term 'structural isomerism'.
3. 1(a)(iii)1 markState the type of structural isomerism present in Compound A.
4. 1(a)(iv)4 marksDescribe TWO types of structural isomerism other than the one given in (a)(iii). Draw examples of displayed structures of EACH type.
5. 1(b)(i)5 marksComplete Table 1 by inserting the appropriate observations and inferences in the spaces provided.
6. 1(b)(ii)2 marksBased on the observations and inferences, (i) to (iv) in Table 1, predict the functional groups for Product R and Product S.
7. 1(b)(iii)1 markDraw the DISPLAYED structure of either Product R or Product S which is formed from the oxidation of the hydrocarbon.
8. 1(b)(iv)2 marksName and draw the displayed structure of the hydrocarbon C5H10 that was oxidized.
9. 1(c)(i)1 markDeduce the monomer used to form the polymer in Figure 2.
10. 1(c)(ii)2 marksUsing the diagram in Figure 2 and your response from (c)(i), explain how addition polymers are formed.
11. 1(c)(iii)3 marksIdentify the reagent(s) used and describe the colour changes expected in order to distinguish the polymer from the monomer.
12. 1(c)(iv)2 marksState TWO characteristics of condensation polymers.
13. 1(c)(v)3 marksCondensation polymers may be classified based on the type of linkage present. List THREE examples of condensation polymers.
14. 2(a)3 marksDraw a diagram to show the approximate wavelength ranges of any THREE types of radiation which are found in the electromagnetic spectrum.
15. 2(b)2 marksThe energy of an electronic transition has a frequency of 1.01 × 10^16 Hz. Calculate the energy of the radiation emitted.
16. 2(c)3 marksOn Figure 3, draw the possible transitions associated with the absorption in this UV/VIS region of the spectrum.
17. 2(d)(i)1 markState what would be observed when the ammonia is added.
18. 2(d)(ii)1 markGive the reason why the wavelength of 615 nm was chosen.
19. 2(d)(iii)3 marksDescribe how a calibration curve can be made and used in the analysis process.
20. 2(e)(i)3 marksCalculate the concentration of the known Cu2+ ions, in mol/dm^3.
21. 2(e)(ii)3 marksApplying Beer-Lambert's law, calculate the molar absorptivity using the stated absorbance value.
22. 2(e)(iii)1 markCalculate the concentration of the Cu2+ ions in this sample.
23. 2(f)4 marksOutline the steps in analysing a sample using UV/VIS spectroscopy.
24. 2(g)2 marksExplain the principles of infrared spectroscopy.
25. 2(h)(i)2 marksCompound D exhibits characteristic absorption wave numbers 1695 cm^-1 and 1619 cm^-1 in the infrared spectrum. Indicate the functional groups responsible for these absorptions.
26. 2(h)(ii)2 marksIndicate TWO types of vibrations that could be exhibited by Compound D.
27. 3(a)2 marksList FOUR factors that must be considered with respect to the location of an industrial plant.
28. 3(b)(i)5 marksWith the aid of equations, outline the first TWO steps in the Contact process.
29. 3(b)(ii)1 markGive an example of the use of an oxide of sulfur in the food industry.
30. 3(b)(iii)2 marksState TWO environmental concerns associated with sulfur dioxide.
31. 3(c)(i)7 marksWith the aid of balanced equations, briefly explain how aluminium oxide is separated from bauxite ore.
32. 3(c)(ii)4 marksAluminium oxide is electrolysed to obtain aluminium (smelting). Write the main reactions occurring at the anode and cathode.
33. 3(c)(iii)2 marksDescribe any ONE impact of the production of alumina on the environment.
34. 3(d)2 marksWrite the equations that show the formation of these oxides.
35. 3(e)(i)2 marksDescribe a qualitative chemical test that can be used in school laboratories to detect the presence of aqueous nitrate ions.
36. 3(e)(ii)2 marksCompared to the cadmium reduction method, state, with reason, whether the method suggested in (e)(i) is suitable for the determination of nitrate ions as a pollutant in water samples.
37. 3(e)(iii)1 markName the reagent that can be used in school laboratories to detect the presence of phosphate ions.