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chemical reactions and equations — Science STD 10 — Question

Gujarat BoardEnglish MediumSTD 10Sciencechemical reactions and equations3 Marks
Question
Respiration is an exothermic reaction (process). Why?
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Answer

  • We need energy for staying alive.
  • We get this energy from the diet (food), we eat.
  • Food is broken down into simple substances during digestion.
  • For example, Rice, potatoes and bread consists of carbohydrates.
  • These carbohydrates are broken down to form glucose.
  • This glucose combines with oxygen in the cells of our body and provides energy.
  • This reaction (process) is called respiration.
  • Thus, energy is released during respiration process, it is called an exothermic reaction.
  • $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6(\mathrm{aq})+6 \mathrm{O}_2(\mathrm{aq}) \rightarrow 6 \mathrm{CO}_2(\mathrm{aq})+6 \mathrm{H}_2 \mathrm{O}(\mathrm{l})+$ Energy

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