Chemistry
Grade-8
Easy
Question
Everyday uses of exothermic reactions includes:
(i) Self-heating cans - 
(ii) Sport injury pack - 
(iii) Burning of petrol - 
(iv) Melting solid salts - 
- Only (i) and (ii)
- Only (i) and (iii)
- Only (i) and (iv)
- Only (ii) and (iv)
Hint:
Exothermic reaction release heat or light or both.
The correct answer is: Only (i) and (iii)
- An exothermic reaction is a reaction that releases energy in the form of light or heat. Therefore, in exothermic reactions, energy is transferred to the environment instead of taking energy from the environment as in endothermic reactions.
- In (i) we see the cans which heat up by themselves. These release heat and do not take it from the surroundings.
- In (iii) The burning of petrol is shown. While petrol is burned it gives out heat and light, which makes it an exothermic reaction.
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