Question

what is chemical equations​

Answer 1

Answer:

A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side. ... The first chemical equation was diagrammed by Jean Beguin in 1615.

Answer 2

Answer:

$\huge\large\bold\purple{chemical \: equation}$

The shorthand and symbolic representation of chemical reactions using words and formula,is known as Chemical equation.

There are two types of chemical equations:

1)Balanced Chemical Equation:

A type of chemical equation in which the number of reactants and products are equal. This follows the law of conservation of mass.

Example,

Na + Cl=========>NaCl

2)Skeletal Chemical Equation (Unbalanced):

In this type of chemical equation,the no.of reactants and no.of products are not equal. These reactions need to be balanced.

Example,

H2 + O2========>H2O

There are five types of chemical reactions:

1. Combination reaction:

A type of chemical reaction in which two or more substances(elements or compounds) combine to form a new substances.

There are three types of combination reactions:

1) Reaction between a compound and an element

2) Reaction between a compound and a compound

3) Reaction between an element and an element

Example,

H2 + O2=======>H2O

2. Decomposition reaction:

When a compound decomposes to form simpler compounds or elements,this is known as decomposition reaction.

There are types of decomposition reactions:

1) Electrolysis

2) Thermal Decomposition Reaction

3)Photochemical reaction or photolysis

Example,

FeSO4======>Fe2O3 + SO2 + SO3

3. Displacement reaction:

When a more reactive substance displaces a less reactive one from it's aqueous solution,it is known as displacement reaction.

Example,

Fe + CuSO4========>Cu + FeSO4

4. Double displacement reaction:

Exchange of atoms and ions between substances to form new substances

Example,

Na2SO4 + BaCl2========>

NaCl + BaSO4

5. Redox reaction:

When oxidation(addition of Oxygen or loss of electrons) and reduction(removal of Oxygen and gain of electrons) occur simultaneously,it is known as redox reaction.

Example,

CuO + H2=======>Cu + H2O

Here,CuO is being reduced to Cu and H2 is being oxidised to H2O.

P.S.,

Aqueous:

Saturated solution of substances

Exothermic Reactions:

Reactions in which heat energy is evolved.

Example,

CaO + H2O======>Ca(OH)2 + heat

Endothermic Reactions:

Reactions in which heat energy is absorbed. Similar to Thermal Decomposition Reaction.