Chemical
Reaction and
Class 10 th
Science
,Topics in the Chapter
➢ Introduction
➢ Chemical reaction
➢ Chemical equation
➢ Balanced chemical equation
➢ Types of chemical reaction
➢ Corrosion
➢ Rancidity
Introduction
Most of the substances around us undergoes various changes.
Some of these are temporary with no new substances being formed.
They are called physical changes.
In certain other changes the new substances formed in which
the reactant or the parent loses its identity to form new substances
called product. These changes are permanent changes as we won’t
get the reactant back.
Chemical Reaction
Chemical reaction is the process by which two or more
substances react with each other to form new substance with
different properties.
These are the following changes to determine that the chemical
reaction has taken place:
, i. Change in state
ii. Change in colour
iii. Evolution of gas
iv. Change in temperature
Chemical Equation
A chemical equation is the symbolic representation of a chemical
reaction in the form of symbols and formulae, where in the reactant
entities are given on the left-hand side and the product entities on the
right-hand side.
Magnesium + oxygen → Magnesium oxide
(Reactant) (Product)
Balanced chemical equation
The chemical equation that shows the chemical reaction needs
to be balanced. A balanced chemical equation occurs when the
number of the atoms involved in the reactants side is equal to the
number of atoms in the product side.
Zn + H2SO4 → ZnSO4 + H2
3Fe (s) + 4 H2O (g) → Fe3O4 (s) + 4H2(g)
Types of chemical reaction
Reaction and
Class 10 th
Science
,Topics in the Chapter
➢ Introduction
➢ Chemical reaction
➢ Chemical equation
➢ Balanced chemical equation
➢ Types of chemical reaction
➢ Corrosion
➢ Rancidity
Introduction
Most of the substances around us undergoes various changes.
Some of these are temporary with no new substances being formed.
They are called physical changes.
In certain other changes the new substances formed in which
the reactant or the parent loses its identity to form new substances
called product. These changes are permanent changes as we won’t
get the reactant back.
Chemical Reaction
Chemical reaction is the process by which two or more
substances react with each other to form new substance with
different properties.
These are the following changes to determine that the chemical
reaction has taken place:
, i. Change in state
ii. Change in colour
iii. Evolution of gas
iv. Change in temperature
Chemical Equation
A chemical equation is the symbolic representation of a chemical
reaction in the form of symbols and formulae, where in the reactant
entities are given on the left-hand side and the product entities on the
right-hand side.
Magnesium + oxygen → Magnesium oxide
(Reactant) (Product)
Balanced chemical equation
The chemical equation that shows the chemical reaction needs
to be balanced. A balanced chemical equation occurs when the
number of the atoms involved in the reactants side is equal to the
number of atoms in the product side.
Zn + H2SO4 → ZnSO4 + H2
3Fe (s) + 4 H2O (g) → Fe3O4 (s) + 4H2(g)
Types of chemical reaction
