Heat may be______ or ____ during a chemical change.
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Answer:
1-> Released
2-> Applied / Added
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Heat may be absorbed or released during a chemical change.
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Exothermic reaction:
☛ A chemical reaction in which heat is given out is called the exothermic reaction..It causes a rise in the temperature.
In an exothermic reaction, total energy content of reactants is more than that of products.
Endothermic reaction:
☛ A chemical reaction in which heat is absorbed is called endothermic reaction. It causes fall in temperature.
Thus, such reactions cannot be sustained without supply of energy from an external source.
In endothermic reaction, total energy content of products is more than that of reactants.
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