Match each item in List A with a correct response in List B by writing its letter below the number of the corresponding item in the table provided.

Boresha ili kuona majibu ya mfano.

The following are possible causes of accidents which can occur in the Chemistry laboratory. State how you can avoid them. (i) Poisonous chemicals left in an unlocked cupboard (ii) A student picking up a bottle containing concentrated H₂SO₄ acid by the neck (iii) Concentrated acids stored in the uppermost shelf of cupboard

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Mariam was preparing food for her family using hot oil in a frying pan. Accidentally the pan tripped over and a huge fire spread over her kitchen floor. (i) Mention two extinguishers which would be appropriate for putting out the fire. (ii) Which fire extinguisher would be dangerous to use when trying to put out the fire in (a) above? Give reason. (b) Mention three conditions for a fire to start. (c) (i) What is combustion? (ii) Give three areas where combustion is applied.

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In an experiment, two iron nails A and B were used whereby painting was applied on nail A. The two nails were placed in a moist environment and after one month the weight of each nail was determined. Which of the two nails would be heavier? Give reason. (b) State the method which will be used to protect each of the following from rusting: (i) Covering iron sheets with a layer of most reactive metals (ii) Bicycle chain (c) Find the oxidation number of the underlined elements in the following: (i) MnO₄⁻ (ii) K₂Cr₂O₇

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Write the chemical symbol for each of the following elements: (i) Silver (ii) Lead (iii) Manganese

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(i) Which is the most abundant element on the earth’s outer crust? (ii) The term used for acidic chemicals which can burn your skin is (iii) Give the name of a flame which forms soot

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(i) State the modern periodic law (ii) Give the special name for each of the following groups of elements in the periodic table: Group I Group VII (iii) Why is the atomic number a better way of identifying an element than the mass number?

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List four uses of hydrogen in our daily life.

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The following is a set of apparatuses which are used for heating:

Mention three categories of fuel and give two examples in each category.

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