Chemistry
Grade-8
Easy
Question
Categorize the following process into the exothermic and endothermic reactions.
A. Splitting gas molecule
B. Baking bread
C. Mixing water with calcium oxide
D. Melting solid salts
E. Rusting of Iron
Hint:
The main difference between exothermic and endothermic reactions is that endothermic reactions absorb energy in the form of heat from the surroundings while exothermic reactions release energy to the surroundings.
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.
- Endothermic reactions are chemical reactions in which reactants absorb thermal energy from the environment to form products.
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