Q35 of 152 Page 20

Give one example of an exothermic reaction and one of an endothermic reaction.

Example of Exothermic Reaction:

C (s) + O2 (g) CO2 + Heat


Example of endothermic reaction:


N2 (g) + O2 (g) + Heat 2NO (g)



More from this chapter

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34 State one characteristic each of the chemical reaction which takes place when:

(i) dilute hydrochloric acid is added to sodium carbonate


(ii) lemon juice is added gradually to potassium permanganate solution


(iii) dilute sulphuric acid is added to barium chloride solution


(iv) quicklime is treated with water


(v) wax is burned in the form of a candle

 35 What do you understand by exothermic and endothermic reactions? 35 Which of the following are endothermic reactions and which are exothermic reactions ?

(i) Burning of natural gas


(ii) Photosynthesis


(iii) Electrolysis of water


(iv) Respiration


(v) Decomposition of calcium carbonate

 36 One of the following does not happen during a chemical reaction. This is: