Changes
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Physical changes involve temporary, reversible changes to a substance without producing new substances, such as melting or evaporation, while chemical changes are permanent and involve new substances forming, like burning or rusting. Reactions are also classified based on the type of energy absorbed or released, such as endothermic reactions absorbing heat, exothermic reactions releasing heat, photochemical reactions involving light, and electrochemical reactions relating to electrical energy.
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Changes
- 2. Physical changes. Chemical changes. Physical changes Temporary changes in which no new substances are formed are called physical changes. Eg:- evaporation of water, melting of ice.
- 3. Chemical changes Permanent changes in which new substances are produced are called chemical changes. Eg:- burning of paper, rusting of iron.
- 4. The reactions in which heat energy is absorbed or released is known as thermo chemical reactions.
- 5. Endothermic reactions Chemical reactions in which heat energy is absorbed is called endothermic reactions.
- 6. Exothermic reactions Chemical reactions in which heat energy is released is called exothermic reactions.
- 7. Endothermic reaction Exothermic reaction
- 8. Reactions in which light energy is absorbed or released are called photochemical reactions.
- 10. Chemical reactions in which electrical energy is absorbed or released are called electrochemical reactions.
- 11. Voltaic cell Electrolysis of water