Energy Changes

Physical and chemical change of Class 7

About Energy Changes

All chemical reactions take place either by the absorption or the release of energy, generally in the form of heat energy.

Exothermic reactions:

This chemical reactions which proceed with the release of heat energy, are called exothermic reactions.

For example, When magnesium ribbon is heated from its tip in a Bunsen flame, it catches fire and burns with a dazzling white flame with release of heat and light energy. The product formed is magnesium oxide.

exothermic reaction

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