CAPE Chemistry Unit 1 · 2017 · Paper 2

36 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)2 marksDefine the term 'relative atomic mass'.
2. 1(b)2 marksDalton's atomic theory suggests that: • all atoms of a particular element are identical • atoms of elements are indivisible. State TWO pieces of evidence that lead to the rejection of these claims.
3. 1(c)2 marksWrite the equation which represents the capture of a neutron by a fluorine-19 atom with the resultant expelling of an α-particle.
4. 1(d)2 marksCalculate the relative atomic mass of the metal.
5. 1(e)7 marksL, M and N are examples of three solid compounds which are ionic, polar and covalent respectively. Using the format in Table 1, describe THREE simple laboratory tests, stating the corresponding observations, to show the…
6. 2(a)2 marksDefine the term 'standard electrode potential'.
7. 2(b)2 marksIdentify the parts of the standard hydrogen electrode labelled A and B in Figure 2.
8. 2(c)(i)4 marksConstruct a labelled diagram to represent this cell and indicate the direction of electron flow when the cell is operating.
9. 2(c)(ii)2 marksWrite the relevant equations to represent the change taking place at the anode and the cathode. Anode: Cathode:
10. 2(c)(iii)2 marksWrite the balanced equation for the OVERALL cell reaction.
11. 2(c)(iv)1 markRefer to the data booklet to calculate the standard cell potential.
12. 2(d)2 marksList TWO types of energy storage devices.
13. 3(a)(i)1 markDefine the term 'disproportionation'.
14. 3(a)(ii)3 marksWrite the balanced equation for the reaction above and hence deduce the oxidation number of chlorine in KClO₃ and KClO₄ respectively.
15. 3(b)3 marksExplain the trend in volatility of the halogens as the group is descended.
16. 3(c)5 marksComplete Table 2 to show the student's record of the observations made.
17. 3(d)3 marksWrite an ionic equation to show the oxidizing nature of sulfuric acid in Test (c) (i).
18. 4(a)3 marksApply the concept of the 'hybridization of atomic orbitals' to explain the planarity of the ethene molecule.
19. 4(b)(i)2 marksState TWO principles which form the basis of the valence-shell electron pair repulsion (VSEPR) theory.
20. 4(b)(ii)4 marksUse the VSEPR theory to account for the difference in shape between the ammonia molecule (NH₃) and the ammonium ion (NH₄⁺). Ammonia molecule (NH₃): Ammonium ion (NH₄⁺):
21. 4(c)6 marksCalculate the molar ratio of Cr₂O₇²⁻ to I⁻ and hence derive the ionic equation for the reaction which has occurred. Molar ratio: Ionic equation:
22. 5(a)(i)2 marksExplain EACH of the following terms: Rate law
23. 5(a)(ii)2 marksExplain EACH of the following terms: Order of reaction
24. 5(b)(i)2 marksWrite an expression for the rate law.
25. 5(b)(ii)1 markWrite an expression for the OVERALL order of reaction.
26. 5(b)(iii)1 markThe overall order of this reaction was found to follow second-order kinetics. Deduce the units of the rate constant for the reaction.
27. 5(c)3 marksUse the information relating to the kinetics of the reaction to write the equation representing the rate determining step. Give a reason for your response. Equation: Reason:
28. 5(d)(i)2 marksPlot the data on the grid provided on page 17, circling the plotted points.
29. 5(d)(ii)2 marksUsing the graph in (d) (i), calculate the rate constant for the decomposition of nitrogen(V) oxide at 333 K, stating the appropriate units.
30. 6(a)3 marksExplain, using relevant data from Table 4, the trends in the atomic radius and ionization energy of the metals.
31. 6(b)(i)1 markDescribe the difference in the reactions of calcium and barium with water.
32. 6(b)(ii)2 marksUsing the data from Table 4, explain the differences described in (b) (i).
33. 6(c)(i)2 marksDescribe the difference in the reactions of the chlorides of elements Na, Mg and Al with water.
34. 6(c)(ii)5 marksWith reference to the ionic radius and electropositivity of the elements, explain the differences in (c) (i) and deduce the type of bonding present in the chlorides. Differences: Type of bonding:
35. 6(d)(i)1 markState how calcium oxide is used in agriculture.
36. 6(d)(ii)1 markWrite an ionic equation to represent the process involved in the use stated in (d) (i).