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ARISTO/WILSON Chemistry Series CHEMISTRY – A Modern View Exercise Book 1 (ANSWERS) Chapter 5 1. 2. 3. 4. Rocks and minerals C C D B 5. B 6. (a) A : calcium oxide (quicklime) B : calcium hydroxide solution (limewater) C : calcium carbonate D : calcium chloride (b) (i) When water is added to the white solid of calcium oxide, it turns into a white suspension of calcium hydroxide (slaked lime), and gives out a lot of heat at the same time. After filtration, a clear solution of calcium hydroxide (limewater) is formed. Calcium oxide + water calcium hydroxide (ii) The clear colourless solution turns milky when carbon dioxide is passing through it. Calcium hydroxide (limewater) + hydrochloric acid calcium chloride + water (iii) Effervescence occurs. The solid calcium carbonate dissolves to give a colourless solution. Calcium carbonate + hydrochloric acid calcium chloride + carbon dioxide + water (iv) No observable change. Calcium hydroxide + hydrochloric acid calcium chloride + water 7. (a) Ores (b) Haematite (c) After concentrating the haematite ore, the ore is heated with coke (carbon) to a high temperature in a blast broken down into smaller pieces. Iron(III) oxide + carbon iron + carbon dioxide 8. (a) Weathering rocks is the slow process (usually over thousands of years) in which exposed rocks are broken down into smaller pieces. (b) See textbook 1 , pages. 94 – 95 9. Refer to your textbook !