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InterviewSolution
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(ii) How will you identify whether a chemical reaction is exothermic or endothermic innature?(iii) Which law of chemical combination is associated with the balancing of a chemicalequation?(iv) Why should a magnesium ribbon be cleaned before burning in air? |
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Answer» 1. In exothermic reaction heat energy is released at the end of the reaction. If the product mixture is at a higher temperature than reactants, the reaction is exothermic. In endothermic reaction heat energy is absorbed. The temperature of the reaction mixture is more before the reaction than after. 2. Balancing of equations is governed by law of conservation of mass. For eg. If the mass of aluminium in the reacting species is 27g then the mass of aluminium in the product species will also be 27g. 3. Magnesium ribbon must be cleaned before burning in air so that the layer of magnesium oxide (which is formed due to reaction of magnesium with air) can be removed in order to get the desired chemical reaction. |
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