Question

whrite the summary of chapter chemical reaction and equation class 10.
plz i need short summary of 1 page
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Answer 1

Answer:

? Physical Change: Change in physical properties.

� Melting

� Boiling

� Condensation

� [Note- No change occurs in the identity of the substance].

? Chemical Change:

� Atoms in the reactants are rearranged to form one or more different substances.

� Old bonds are broken, new bonds are formed.

� Reactants lose their properties to form product of different properties.

4 Fe(s) + 3O2 ?2Fe2O3 (rust). Iron Oxygen Ferric oxide

? Chemical equation:

The symbolic representation of a chemical reaction is called a

chemical equation.

Features of a chemical equation:

� The reactants are written on the left hand side with a plus sign between them.

� The products are written on the right hand side with a plus sign between them.

� An arrow separates the reactants from the products. The arrow head points towards the products and indicates the direction of the reaction.

Skeletal chemical equation: A chemical equation which simply represents the symbols and formulas of reactants and products taking part in the reaction is known as skeletal chemical equation for a reaction.

For example: For the burning of Magnesium in the air, Mg + O2 ? MgO is the skeletal equation.

� Balanced chemical equation: A balanced equation is a chemical equation in which number of atoms of each element is equal on both sides of the equation i.e number ofatoms of an element on reactant side = number of atoms of that element on the product side.

? Identification:

Combustion :

AB + O2 ? Oxide of A & B.

Combination :

A + B ? C

Decomposition :

AB ? A + B

Displacement :

A + BC (aq) ? AC (aq) + B

Double Displacement :

AB (aq) + CD (aq) ? AD (aq) + CB