Chemical Reactions and Chemical Formula | Chemistry Notes Info - Your Chemistry Tutor provide notes for Classes, BSc, MSc, Chemistry Test

Chemical Reactions and Chemical Formula

Chemical Reactions

 Chemistry AppsChemical 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
Oxygen (O)
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
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