Chemical Reactions
Chemical Reaction is the reaction
in which two or more than two substances react to form a new substance is known
as Chemical Reaction. The substances which react may be ion or compound
of element.
Reaction:
Reactant reacts with each other to give product.
Reactant --------> Product
Example of general chemical reactions
from daily life is rusting of iron, formation of curd from milk etc.
Chemical Formula
Chemical Formula
is simple representation of any compound by writing together the numbers and
symbols of constituting elements forming that compound.
Example: H2O, CaCl2,
AlCl3, Ca(OH)2
Chemical Formula for Ionic Compounds
As
we know Ionic compound formed as a result of electron transfer between metal
and non-metal atoms. When we have to write chemical formula for ionic compound
then write metal atom symbol on left hand side and non-metal atom symbol on
right hand side. Metal atom name remain same but ‘ide’ or ‘ate’suffix is added
to non-metal atom name.
Ionic compound formed by one metal atom and non-metal atoms.
Metal Atom
|
Non-Metal Atom
|
Name of Compound
|
Chemical Formula of Compound
|
||
Name and Symbol
|
No.
|
Name and Symbol
|
No.
|
||
Calcium (Ca)
|
1
|
1
|
Calcium Oxide
|
CaO
|
|
Magnesium (Mg)
|
1
|
Chlorine (Cl)
|
2
|
Magnesium Chloride
|
MgCl2
|
Aluminium (Al)
|
1
|
Chlorine (Cl)
|
3
|
Aluminium Chloride
|
AlCl3
|
Chemical Formula for Covalent Compounds
As
we know covalent compound formed as a result of electron sharing and contains
non-metal atoms. When we have to write chemical formula for covalent compound
then relatively less electronegative non-metal atom symbol is written on left
hand side and other witch is more electronegative is written on right hand side. Name of non-metal atom
which is written on left hand side is remain same but ‘ide’ suffix is added to
non-metal atom name which is written on right hand side.
Covalent compound formed by two non-metal atoms.
Low Electronegative
Non-Metal Atom
|
High Electronegative
Non-Metal Atom
|
Chemical Name of
Compound
|
Chemical Formula of Compound
|
||
Name and Symbol
|
No.
|
Name and Symbol
|
No.
|
||
Carbon (C)
|
1
|
Oxygen (O)
|
1
|
Carbon Mono Oxide
|
CO
|
Carbon (C)
|
1
|
Oxygen (O)
|
2
|
Carbon Di Oxide
|
CO2
|
Phosphorus (P)
|
1
|
Chlorine (Cl)
|
3
|
Phosphorus Tri Chloride
|
PCl3
|
Phosphorus
(P)
|
1
|
Chlorine (Cl)
|
5
|
Phosphorus Penta Chloride
|
PCl5
|
Nitrogen
(N)
|
2
|
Oxygen (O)
|
5
|
Nitrogen Penta Oxide
|
N2O5 |
