Class 10th Science NCERT book
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Chapter 1 - Chemical Reactions and Equations What is Chemical change? Chemical change is a change in which one or more new substances are formed. In a chemical change— • New substances are formed. • Energy changes are involved. • There is a change in mass during the reaction. • Permanent change takes place. Examples – ❖ Cooking of food ❖ Rusting of iron ❖ Heating of Lead nitrate ❖ Souring of milk ❖ Ripening of fruit. Rusting of iron is a chemical change because ❖ A new substance iron oxide is formed. ❖ The change is permanent; the article has got a rust layer (which may only peal off). ❖ There is an increase in mass when rust forms. ❖ An energy change has taken place (which may not be visible). Chemical changes are also known as chemical reactions. Exothermic Reaction - A chemical reaction which is accompanied by evolution of heat energy is known as exothermic reaction. The amount of heat (energy) produced is written along with the products. This indicates that...
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