This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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a) State and explain the observation made in: (i) Boiling tube A Observation: The black solid turns pinkish-brown. Explanation: Copper (II) oxide (black) is reduced by carbon (charcoal) to form copper metal (pinkish-brown) and carbon dioxide gas. (ii) Boiling tube B Observation: The colorless solution turns milky/cloudy (or a white precipitate forms). Explanation: The carbon dioxide gas produced in boiling tube A reacts with calcium hydroxide solution (limewater) to form insoluble calcium carbonate, which appears as a white precipitate. b) Write an equation for the reaction occurring in: (i) Boiling tube A 2CuO(s) + C(s) heat 2Cu(s) + CO_2(g) (ii) Boiling tube B Ca(OH)_2(aq) + CO_2(g) → CaCO_3(s) + H_2O(l) That's 2 down. 3 left today — send the next one.