Why is respiration considered an exothermic process?
(ii) A shiny brown colored element X on heating in air becomes black in colour. Name the element X and the black colored compound formed. Give a chemical equation for this reaction.

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Solution

(i) Respiration is an exothermic process because in this process oxidation of glucose takes place which is highly exothermic reaction and thus generate a lot of energy.The chemical equation for respiration is :

C₆H₁₂O₆ +6 O₂ $\to$ 6 CO₂ + 6 H₂O + heat
Thus due to heat generated in the chemical reaction, the respiration process is exothermic.

(ii) The shiny brown coloured substance is Copper (Cu). When copper reacts with oxygen of air, it forms a black compound copper oxide (CuO).

2 Cu(s) + O₂ (g) $\to$ 2 CuO (s)
copper oxygen Copper oxide
(red-brown) (from air) (black)

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Why is respiration considered an exothermic process?(ii) A shiny brown colored element X on heating in air becomes black in colour. Name the element X and the black colored compound formed. Give a chemical equation for this reaction.

Why is respiration considered an exothermic process?
(ii) A shiny brown colored element X on heating in air becomes black in colour. Name the element X and the black colored compound formed. Give a chemical equation for this reaction.