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(a) Give the main differences between physical changes and chemical changes. (b) Which of the following are chemical changes and which physical ? Give reason. (i) a glass bottle breaking (ii) coal burning in air (iii) making a cake (iv) wool being knitted into a sweater |
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Answer» (a) Give the main differences between physical changes and chemical changes. (b) Which of the following are chemical changes and which physical ? Give reason. (i) a glass bottle breaking (ii) coal burning in air (iii) making a cake (iv) wool being knitted into a sweater |
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