Q10 of 28 Page 14

Why respiration is considered an exothermic reaction? Explain.

In the process of respiration, the glucose combines with oxygen in the cells of our body to form carbon dioxide and energy is released. That’s why it is considered an exothermic reaction.


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8

Write the balanced chemical equation for the following and identify the type of reaction in each case.

(a) Potassium Bromide (aq) + Barium iodide (aq) →Potassium iodide (aq) +Barium bromide (s)
(b) Zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide (g)


(c) Hydrogen(g) + Chlorine (g) → Hydrogen chloride (g)


(d) Magnesium + Hydrochloric →Magnesium chloride (aq) + Hydrogen (g)

 9

What does one mean by exothermic and endothermic reactions? Give examples.

 11

Why decomposition reactions are called the opposite of combination reactions? Write equations for these reactions.

 12

Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.