Textbook 4. Match each of the items given in List A with the appropriate item in List B. List A (a) elemental mercury List B (b) uranium-235 (i) low energy requirement (c) thick lead (ii) very dense liquid (d)americium-241 (iii) shield that can block gamma ray (e) green synthesis (iv) a fuel for a nuclear reactor (v) used in a smoke detector 5. Give one word for each of the following descriptions: (a) The cycle of natural pathways in which essential elements of living matter circulate (b) Lowering the pH of the ocean by the uptake of carbon dioxide from the atmosphere (c) Radioactive decay by which the nucleus of an unstable atom loses energy (d) A process by which substances are broken down by the action of sunlight (e) A chemical used to kill pests Chemistry Grade 12

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Textbook 4. Match each of the items given in List A with the appropriate item in List B. List A (a) elemental mercury List B (b) uranium-235 (i) low energy requirement (c) thick lead (ii) very dense liquid (d)americium-241 (iii) shield that can block gamma ray (e) green synthesis (iv) a fuel for a nuclear reactor (v) used in a smoke detector 5. Give one word for each of the following descriptions: (a) The cycle of natural pathways in which essential elements of living matter circulate (b) Lowering the pH of the ocean by the uptake of carbon dioxide from the atmosphere (c) Radioactive decay by which the nucleus of an unstable atom loses energy (d) A process by which substances are broken down by the action of sunlight (e) A chemical used to kill pests Chemistry Grade 12

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4. Matching the items in List A with the appropriate items in List B:(a) elemental mercury - (ii) very dense liquid(b) uranium-235 - (iv) a fuel for a nuclear reactor(c) thick lead - (iii) shield that can block gamma ray(d) americium-241 - (v) used in a smoke detector(e) green synthesis - (e) green synthesis5. One word for each of the following descriptions:(a) The cycle of natural pathways in which essential elements of living matter circulate - Ecosystem(b) Lowering the pH of the ocean by the uptake of carbon dioxide from the atmosphere - Acidification(c) Radioactive decay by which the nucleus of an unstable atom loses energy - Emission(d) A process by which substances are broken down by the action of sunlight - Photolysis(e) A chemical used to kill pests - Insecticide

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