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Explanation:
1. When an equal number of atoms of an element is present on both sides of a chemical equation ,the equation is balanced.
3. Carbohydrates present in food are broken down to form glucose. This glucose combines with oxygen in the cells of our body and provides energy. This reaction is known as respiration. Hence, respiration is considers as an exothermic process.
4. Photolytic decomposition is chemical reaction where photons are broken down and interacts with target molecules.
5. Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products
example : thermal decomposition of calcium carbonate.
sorry 2nd answer I don't know
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