class 10 science Chemical Reactions,Reactant & Product Equations Ch

Cbse class 10 science Chemical Reactions and Equations Chapter 1

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Cbse class 10 science Chemical Reactions and Equations Chapter 1

Chemical Reaction
Reactant & Product
Chemical Equation

Chemical Reaction: The transformation of chemical substance into another chemical substance is known as Chemical Reaction. For example: rusting of iron, setting of milk into curd, digestion of food, respiration, etc.

In chemical reaction new substance is formed which is completely different in properties from the original substance, so in a chemical reaction chemical change takes place.

Signs of Chemical Reaction
Change of colour of substance
Change of state of substance
Evaluation of heat/ gas/ light/ sound
Absorption of heat, etc

Reactant – Any substance that undergoes a chemical change in a given reaction. It is also known as interactant.
Product – A new substance obtained from another substance through chemical reaction.

Chemical Equation – A symbolic representation showing the kind and amount of the starting materials and product of a reaction. Example = A+B->X+Y
In this equation, A and B are Reactants and X and Y are Products. Arrow shows the direction of chemical reaction.
Example: When Oxygen reacts with Hydrogen results Water.

Hydrogen and oxygen are reactants, H₂O is Product and arrow represent chemical reaction. And this reaction can be represented by following chemical reaction.
H2+O2->H2O.

Chemical Equation can be divided into two types
• Balanced chemical equation
• Unbalance chemical equation.

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