Explain the importance of the chemistry syllabus in four points.

1. Explain the importance of the chemistry syllabus in four points. (4 mk)

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Identify four features of micro-teaching that differentiate it from other teaching practices.

1. Identify four features of micro-teaching that differentiate it from other teaching practices. (4 mk)

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(a) Explain the difference between homogeneous and heterogeneous equilibria. (b) Given an equilibrium reaction: N2(g) + 3H2(g) <=> 2NH3(g) at 230oC: (i) write an expression of an equilibrium constant, (Kc), (ii) explain what will happen on the equilibrium if NO is removed from the system.

1. Explain the difference between homogeneous and heterogeneous equilibria. (2 mk)
2. write an expression of an equilibrium constant, (Kc), (2 mk)
3. explain what will happen on the equilibrium if NO is removed from the system. (2 mk)

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Explain why, (a) Alkenes are slightly more soluble than their corresponding alkanes (b) the major product of the reaction between 1-butane and hydrogen bromide gas is secondary bromobutane, not primary bromobutane.

1. Alkenes are slightly more soluble than their corresponding alkanes (2 mk)
2. the major product of the reaction between 1-butane and hydrogen bromide gas is secondary bromobutane, not primary bromobutane. (2 mk)

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State four merits of classroom tests.

1. State four merits of classroom tests. (4 mk)

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(a) Explain the concept of soil reaction. (b) Describe two sources of acid in the soil.

1. Explain the concept of soil reaction. (2 mk)
2. Describe two sources of acid in the soil. (2 mk)

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Given the half-reaction equations: MnO4-(aq) + 5e- + 8H+ -> Mn2+(aq) + 4H2O(l) E0 = 1.51V ClO3-(aq) + 2H+ + 2e- -> ClO2-(aq) + H2O(l) E0 = 1.19V (a) Give the overall balanced cell reaction, (b) calculate E0cell.

1. Give the overall balanced cell reaction, (3 mk)
2. calculate E0cell. (3 mk)

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(a) Write electronic configuration of: (i) Copper ( Cu), 29 (ii) calcium ion ( Ca2+).

1. Write electronic configuration of: Copper ( Cu) 29 (2 mk)
2. Write electronic configuration of: calcium ion ( Ca2+) 20 (2 mk)

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Identify the property of cyanide ligand CN- that makes it possible to form complexes with such a transition metal.

1. Find the oxidation state of iron in the complexes, [Fe(CN)6]4- and [Fe(CN)6]3-. (0 mk)
2. Identify the property of cyanide ligand CN- that makes it possible to form complexes with such a transition metal. (0 mk)

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State four uses of a lesson plan.

1. State four uses of a lesson plan. (0 mk)

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A solution of 1dm3 was made by dissolving 28.6 g of impure sodium carbonate in distilled water. A 25 cm3 of this solution was completely neutralized by 24.9 cm3 of 3.65 g of hydrochloric acid in 1dm3 solution. (a) Calculate the concentration of pure sodium carbonate in g/dm3. (b) If the impurity in sodium carbonate is water of crystallization, calculate the value of Z in the formula Na2CO3.ZH2O.

1. Calculate the concentration of pure sodium carbonate in g/dm3. (0 mk)
2. If the impurity in sodium carbonate is water of crystallization, calculate the value of Z in the formula Na2CO3.ZH2O. (0 mk)

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Calculate the wavelength in meter, of a bulb light that is radiated by the energy of 2.76 x 105 Joules.

1. Calculate the wavelength in meter, of a bulb light that is radiated by the energy of 2.76 x 105 Joules. (0 mk)

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(a) Using a relevant example in each case, describe five characteristics of homologous series. (b) Hydrocarbon R was found to contain 84% by mass carbon, and the rest percentage was hydrogen. If its molecular mass was 60 g, find: (i) Empirical formula (ii) molecular formula.

1. Using a relevant example in each case, describe five characteristics of homologous series. (0 mk)
2. Hydrocarbon R was found to contain 84% by mass carbon, and the rest percentage was hydrogen. If its molecular mass was 60 g, find: (i) Empirical formula (ii) molecular formula. (0 mk)
3. Empirical formula (0 mk)
4. molecular formula. (0 mk)

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Suggest five safety precautions for the storage of chemicals in chemistry laboratory.

1. Suggest five safety precautions for the storage of chemicals in chemistry laboratory. (0 mk)

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Elaborate five principles of teaching and learning chemistry.

1. Elaborate five principles of teaching and learning chemistry. (0 mk)

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Describe five procedures to be followed when moderating chemistry test items.

1. Describe five procedures to be followed when moderating chemistry test items. (0 mk)

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