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(a) State the various characteristics of chemical reactions. (b) State one characteristic each of the chemical reaction which takes place when : 1. dilute hydrochloric acid is added to sodium carbonate 2. lemon juice is added gradually to potassium permanganate solution 3. dilute sulphuric acid is added to barium chloride solution 4. quicklime is treated with water 5. wax is burned in the form of a candle |
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Answer» (a) The various characteristics of chemical reactions are: 1. Evolution of a gas 2. Formation of a precipitate 3. Change in colour 4. Change in temperature 5. Change in state. (b) 1. Evolution of carbon dioxide gas 2. Change in colour from purple to colourless 3. Formation of white precipitate of barium sulphate 4. Change in temperature 5. Change in state from solid to liquid and gas. |
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