Chemical equations represent chemical reactions through symbols. The reactants are written on the left side and products on the right. There are several types of chemical reactions including combination, decomposition, single displacement, and double displacement. Combination reactions involve two or more reactants combining to form one product. Decomposition reactions involve a single compound breaking down into simpler substances.

2. Name : Tirth Khatrani
Grade : X
Subject : Science
Topic : Chemical Reactions
And Equation
Submit TO:
Debi Mam

3. Chemical equation
▪ A chemical equation is the symbolic representation of a chemical
reaction wherein the reactant entities are given on the left-hand side
and the product entities on the right-hand side. The coefficients next
to the symbols and formulae of entities are the absolute values of
the stoichiometric numbers. The first chemical equation was
diagrammed by Jean Beguin in 1615.
▪ Reactants  Products
▪ Aluminium (s) + Sulphuric acid (aq)  Hydrogen (g) + Aluminium sulphate
(aq)
▪ Al (s) + H2SO4 (aq)  H2 (g) + Al2(SO4)3 (aq)

4. Types Of Reaction
▪ Combination reaction
▪ Decomposition reaction
▪ Single displacement reaction
▪ Double displacement reaction
▪ Oxidation and Reduction

5. Combination reaction
▪ A combination reaction is a reaction where two reactants
are combined into one product.Those reaction in which two
or more elements or compounds combine together to form a
single compound are called combination reaction. They
may be represented by X + Y → XY Combination
reactions are usually exothermic. For example barium
metal and fluorine gas will combine in a highly
exothermic reaction to form the salt barium fluoride:
▪ Ba + F2
 BaF2

6. Decomposition reaction
▪ Decomposition is a type of chemical reaction and it may be defined
as the reaction in which a single compound splits into two or more
simple substances under suitable conditions. It is just the opposite of
the combination reaction.In a combination reaction, a substance is
formed as a result of chemical combination, while in a
decomposition reaction, the substance breaks into new substances.
▪ 2FeSO4 (s) Heat Fe2O3 (s) + SO2 (g) +SO3 (g)
(Ferrous sulphate) (Ferric oxide)

7. Single displacement reaction
▪ A single-displacement reaction, also named single-replacement
reaction, is a type of oxidation-reduction
chemical reaction when an element or ion moves
out of one compound and into another - that is, one
element is replaced by another in a compound. This is
represented by the general reaction scheme:
▪ Fe (s) + CuSO4 (aq)  FeSO4 (aq) + Cu (s)
(Copper sulphate) (Iron Sulphate)

8. Double displacement reaction
▪ Double displacement reactions may be defined as the chemical
reactions in which one component each of both the reacting
molecules is exchanged to form the products. During this reaction,
the cations and anions of two different compounds switch places,
forming two entirely different compounds.
▪ Na2SO4 (aq) + BaCl2 (aq)  BaSO4 (s) + 2NaCl (aq)
(Sodium (Barium (Barium (Sodium
Suplhate) chloride) sulphate) chloride)

9. Oxidation and Reduction
▪ Oxidation : If a substance gains oxygen during a reaction ,it is
said to be oxidised.
▪ Reduction : If a substance loses oxygen during a reaction ,it is said
to be reduced.

10. Redox
▪ Redox (reduction-oxidation) reactions include all chemical
reactions in which atoms have their oxidation state changed; in
general, redox reactions involve the transfer
of electrons between species.

11. Rancidification
▪ Rancidification, the product of which can be described as rancidity,
is the chemical decomposition of fats, oils and other lipids (this
degradation also occurs in mechanical cutting fluids). When these
processes occur in food, undesirable odors and flavors can result. In
some cases, however, the flavors can be desirable (as in aged
cheeses. In processed meats, these flavors are collectively known
as warmed-over flavor. Rancidification can also detract from the
nutritional value of the food. Some vitamins are highly sensitive to
degradation.

12. Corrosion
▪ Corrosion is the gradual destruction of materials,
(usually metals), by chemical reaction with its
environment.