Observe/study each electronic configuration and suggest the violated rule/principle.

1. Observe/study each electronic configuration and suggest the violated rule/principle. (4 mk)

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Justify the following facts by using the knowledge from chemical kinetics: (a) Some foods require higher temperature during cooking. (b) Fresh fruits and vegetables are stored in a refrigerator. (c) Some foods require baking soda (NaHCO3) during cooking.

1. Some foods require higher temperature during cooking. (1 mk)
2. Some foods require higher temperature during cooking. (0 mk)
3. Fresh fruits and vegetables are stored in a refrigerator. (0 mk)
4. Fresh fruits and vegetables are stored in a refrigerator. (1 mk)
5. Some foods require baking soda (NaHCO3) during cooking. (0 mk)
6. Some foods require baking soda (NaHCO3) during cooking. (1 mk)

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Study the following reactions then write the rate expression in respect to the concentration of the reactants and products: (a) NO (g) + CO (g) -------------→ CO (g) + NO (g) 2 2 (b) S O 2-(aq) + 3I- (aq) --------→ 2SO 2-(aq) + I -(aq) 2 8 4 3 (c) 2N O (g) [O]------------→ 4NO (g) + O (g) 2 5 2 2

1. NO (g) + CO (g) -------------→ CO (g) + NO (g) 2 2 (0 mk)
2. NO (g) + CO (g) -------------→ CO (g) + NO (g) 2 2 (1 mk)
3. S O 2-(aq) + 3I- (aq) --------→ 2SO 2-(aq) + I -(aq) 2 8 4 3 (0 mk)
4. S O 2-(aq) + 3I- (aq) --------→ 2SO 2-(aq) + I -(aq) 2 8 4 3 (1 mk)
5. 2N O (g) [O]------------→ 4NO (g) + O (g) 2 5 2 2 (1 mk)
6. 2N O (g) [O]------------→ 4NO (g) + O (g) 2 5 2 2 (0 mk)

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(a) How many moles are there in 35.8 g of magnesium ribbon? (b) Justify that 3.58 moles of zinc granules contain 232.7 g.

1. How many moles are there in 35.8 g of magnesium ribbon? (0 mk)
2. How many moles are there in 35.8 g of magnesium ribbon? (1 mk)
3. Justify that 3.58 moles of zinc granules contain 232.7 g. (0 mk)
4. Justify that 3.58 moles of zinc granules contain 232.7 g. (1 mk)

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What will happen to a buffer solution made of CH COOH and CH COONa 3 3 when the following solutions are added? (a) Dilute HCl (b) Dilute NaOH

1. Dilute HCl (1 mk)
2. Dilute HCl (0 mk)
3. Dilute NaOH (0 mk)
4. Dilute NaOH (1 mk)

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Examine the IUPAC names of the given complexes and justify the observation of each case. (a) Hexacyanoiron(II) Page 2 of 4 (b) Tetraamminecopper(II) sulphate (c) Tetraaqudichlorochromate(III) chloride.

1. Hexacyanoiron(II) (0 mk)
2. Hexacyanoiron(II) (1 mk)
3. Tetraamminecopper(II) sulphate (1 mk)
4. Tetraaqudichlorochromate(III) chloride. (1 mk)

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Suggest and give reason whether the reaction is free radical substitution, elimination or electrophilic addition.

1. Suggest and give reason whether the reaction is free radical substitution, elimination or electrophilic addition. (4 mk)

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Suggest six components that are essentials to design Chemistry teacher’s guide for Form II secondary school.

1. Suggest six components that are essentials to design Chemistry teacher’s guide for Form II secondary school. (4 mk)

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The introduction of ICT has brought the development in different areas, especially the educational sector. Briefly explain any four significances of ICT in the teaching of Chemistry.

1. Briefly explain any four significances of ICT in the teaching of Chemistry. (4 mk)

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Suppose you have administered Chemistry tests among Form II and III students and the results were as follows: Form II: 65, 67, 95, 41, 25, 55, 41, 71, 41 and 51. Form III: 77, 67, 66, 71, 68, 72, 69, 75, 61 and 76. a) Calculate the spread for each of the test scores. b) What do the two spread values in 10 (a) mean?

1. Calculate the spread for each of the test scores. (10 mk)
2. What do the two spread values in 10 (a) mean? (5 mk)

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Bondeni Village is facing a serious water pollution problem in its water sources. Suggest six ways to overcome the problem.

1. Suggest six ways to overcome the problem of water pollution in Bondeni Village. (15 mk)

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(a) Explain the phenomenon of isomerism. (b) Outline the two types of isomers exhibited by alkenes by citing one example in each. (c) Draw and give the IUPAC names of alkenes that will be obtained from the dehydration of the following compounds: (i) 2 – methylpentan-3-ol (ii) Propan – 2 – ol (iii) 3-methylbutan – 2 – ol (iv) 4,5 – dimethylhexan – 3 – ol

1. Explain the phenomenon of isomerism. (5 mk)
2. Outline the two types of isomers exhibited by alkenes by citing one example in each. (5 mk)
3. Draw and give the IUPAC names of alkenes that will be obtained from the dehydration of the following compounds: (i) 2 – methylpentan-3-ol (ii) Propan – 2 – ol (iii) 3-methylbutan – 2 – ol (iv) 4,5 – dimethylhexan – 3 – ol (5 mk)

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(a) Justify the statement that advancement in chemistry resulted into more negative impacts on the environment. (b) Identify six teaching and learning materials.

1. Justify the statement that advancement in chemistry resulted into more negative impacts on the environment. (10 mk)
2. Identify six teaching and learning materials. (5 mk)

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