CAPE Chemistry Unit 1 · 2011 · Paper 2

39 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)4 marksList FOUR postulates of Dalton's atomic theory.
2. 1(a)(ii)2 marksIdentify TWO of Dalton's postulates which were proven invalid by modern atomic theory.
3. 1(b)(i)3 marksList TWO chemicals and ONE piece of apparatus that the student may use to carry out the investigation.
4. 1(b)(ii)1 markDescribe ONE physical change that the student may have observed.
5. 1(b)(iii)1 markIdentify the reducing agent in the experiment.
6. 1(b)(iv)2 marksWrite relevant half equations to illustrate the chemical changes that occur with EACH element.
7. 1(b)(v)2 marksFrom the half equations in (iv), deduce a balanced equation for the redox reaction.
8. 2(a)(i)1 markList the factor which affects the solubility product constant, Ksp.
9. 2(a)(ii)1 markList ONE factor (except that in (i) above) which influences the solubility of a salt.
10. 2(b)2 marksDescribe the 'common ion effect' as it relates to the solubility of salts.
11. 2(c)(i)2 marksWrite a balanced equation for the formation of calcium and phosphate ions from calcium phosphate.
12. 2(c)(ii)2 marksWrite the expression for the solubility product constant for calcium phosphate.
13. 2(c)(iii)1 markCalculate the ionic product of calcium phosphate in the patient's urine.
14. 2(c)(iv)1 markState why kidney stones are likely to form in the patient's urine.
15. 2(d)5 marksOutline an experimental procedure for the determination of the solubility product constant of barium hydroxide Ba(OH)2.
16. 3(a)1 markWrite the ionic equation of such an element, M, to show the formation of the ion present.
17. 3(b)3 marksUse the information in Table 1 to account for the differences in reactivity of the elements shown.
18. 3(c)(i)1 markComment on the solubility of the sulphate of radium in water.
19. 3(c)(ii)3 marksWrite the balanced equation for the thermal decomposition of the nitrate of radium, Ra(NO3)2.
20. 3(d)(i)3 marksState the steps that should be taken in the investigation of the differences in solubility of the sulphates of magnesium, calcium and barium.
21. 3(d)(ii)2 marksList the names of the reagents that may be used in the investigation.
22. 3(e)3 marksList THREE uses of calcium carbonate.
23. 4(a)4 marksState the FOUR basic assumptions of the kinetic theory with reference to an ideal gas.
24. 4(b)3 marksCalculate the relative molecular mass of Z.
25. 4(c)(i)2 marksState Hess's Law.
26. 4(c)(ii)6 marksConstruct a diagram of a well-labelled Born-Haber cycle showing the formation of magnesium oxide (MgO) from magnesium metal and oxygen gas. On your diagram, show clearly ALL the enthalpy changes and species involved in…
27. 5(a)(i)1 markWhy is chemical equilibrium referred to as dynamic?
28. 5(a)(ii)3 marksState THREE characteristics of a chemical system at equilibrium.
29. 5(b)3 marksDefine the equilibrium constant, Kc, and describe its significance to a system in dynamic equilibrium. In your response make reference to the importance of its magnitude.
30. 5(c)(i)6 marksCalculate the equilibrium concentration of EACH gas, at the same temperature.
31. 5(c)(ii)1 markUsing Le Chatelier's principle, describe the effect, on the equilibrium position, of decreasing the volume of the container.
32. 5(c)(iii)1 markDescribe the effect on the equilibrium constant, Kc, of increasing the temperature of the reaction.
33. 6(a)4 marksCopy and complete the information in Table 2 regarding some physical properties of elements in Group IV of the Periodic Table.
34. 6(b)4 marksUse a knowledge of structure and bonding to explain these trends.
35. 6(c)(i)1 markAccount for the following observation, using the bonding present in the compounds: Silicon tetrachloride is a volatile liquid at room temperature.
36. 6(c)(ii)3 marksAccount for the following observation, using the bonding present in the compounds: When exposed to the atmosphere, SiCl4 produces white fumes while no such fumes are produced with CCl4.
37. 6(d)(i)1 markName the type of reaction taking place.
38. 6(d)(ii)2 marksState the name and the formula of the substance responsible for the presence of the white fumes.
39. 6(e)1 markState ONE use of a ceramic material based on silicon (IV) oxide.