Question

Magnesium(s) + Hydrochloric acid(aq) → Magnesium chloride(aq) + Hydrogen[g)
9. What does one mean by exothermic and endothermic reactions? Give examples.
10. Why is respiration considered an exothermic reaction?​

Answer 1

Explanation:

9)reaction in which heat energy is liberated by the reactants is called exothermic reaction. eg: Carbon + Oxygen gives Carbon Dioxide + Q. reaction in which heat energy is absorbed by the reactants is called endothermic reaction. eg: Nitrogen + Oxygen gives 2 nitrous oxide (2NO) a-a

10)Any reaction that evolves heat as a by-product of the reaction is called an exothermic reaction. ... Therefore, respiration is an exothermic reaction and the heat produced is distributed throughout the body as energy and that is the reason when we breathe out or breath is warm.