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Making bonds

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  • What happens to energy in exothermic reactions?

  • In exothermic reactions, the energy supplied is sufficient for chemical reaction to occur (to break existing bonds) and the excess energy is given in the form of heat (from making new bonds).

  • What type of chemical reaction releases energy?

  • Chemical reactions that release energy are called exothermic. In exothermic reactions, more energy is released when the bonds are formed in the products than is used to break the bonds in the reactants. Exothermic reactions are accompanied by an increase in temperature of the reaction mixture.

  • How is energy absorbed and released in endothermic reactions?

  • In endothermic reactions, more energy is absorbed when the bonds in the reactants are broken than is released when new bonds are formed in the products. Endothermic reactions are accompanied by a decrease in temperature of the reaction mixture. You can use energy level diagrams to visualize the energy change during a chemical reaction.

  • Is respiration endothermic or exothermic?

  • In the reaction given above, it can be noted that C6H12O6 is the formula for glucose, which combines with the oxygen inhaled by humans to form carbon dioxide, water, and energy. This energy produced in the reaction implies that the process of respiration is an exothermic reaction.

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