Chemistry
Grade-8
Easy
Question
Which of the following picture illustrates the exothermic reactions:
Hint:
Burning is an exothermic reaction as it gives out heat and light.
The correct answer is:
- 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.
- For exothermic reactions, the change in enthalpy (ΔH) is negative. Therefore, the net amount of energy required to initiate an exothermic reaction is less than the net amount of energy released by the reaction.
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