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Chemical Reactions
Any chemical change in matter
which involves transformation
into one or more substances with
entirely different properties is
called a chemical reaction.
A chemical reaction is
represented by a
chemical equation.
Substance(s)
taking part 
Reactant(s)
New substance(s)
obtained 
Product(s)
 Combination Reaction (or Synthesis)
 Decomposition Reaction
 Displacement Reaction
 Double Displacement Reaction
E.g.:-
Fe(s) + S(s)  FeS(s)
NH3(g) + HCl(g)  NH4Cl(g)
A + B + ..  C + D + ..
Types of Chemical Reactions
Two substances combine to
form a single substance
Combination Reaction
(or Synthesis)
A + B  AB
E.g.:-
2Hgo(s)  2Hg + O2
2AgCl  2Ag + Cl2
Decomposition reaction
One substance breaks
down into two or
more simple ones
E.g.:-
Zn + CuSO4(aq)  ZnSO4(aq) + Cu
2Na + 2H2O  2NaOH + H2
AB + C  CB + A
C displaces
A from its
molecule.
Displacement Reaction
Double Displacement
Reaction
AB + CD  CB + AD
E.g.:-
AgNO3(aq) + HCl  AgCl + HNO3
CuO + HNO3 Cu(NO3)2 + H2O
Two compounds in their
aqueous state displace
ions or radicals.
A chemical reaction in which a base or
alkali reacts with an acid to produce
salt and water.
 Exothermic Reaction
 Endothermic Reaction
A Chemical reaction in
which heat is released.
A Chemical reaction in
which heat is absorbed.
Oxides
Metallic
Oxides
Non-
Metallic
Oxides
Amphoteric Oxides: Oxides
which are of dual nature and
react with both bases and acids
to produce salt and water. Eg.
Zinc, Lead, Aluminium Oxide.
Non-Metallic
Oxides
Neutralization Reaction
Acid + Base/Alkali  Salt + Water
Metal Reactivity Series
Types of reactions based on energy exchange
Basic Oxides : Most of the
metallic-oxides are basic in
nature and react with acids
to produce salt and water.
Eg. Sodium, Calcium,
Magnesium Oxide.
 Formed on heating metals
 Some are formed on heating
metallic, cabonates, nitrates, etc.
Metallic Oxides
Acidic Oxides : Most of the
non-metallic oxides are acidic
in nature and react with bases
to produce salt and water. Eg.
Carbon, Sulphur dioxide,
Phosphorus Pentoxide.
 Formed on heating non-metals
Neutral Oxides : Oxides which are
neutral in nature and do not
change the colour of indicators. Eg.
Water, nitric, nitrous oxide.
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Chemical reactions-poster-converted

  • 1. Chemical Reactions Any chemical change in matter which involves transformation into one or more substances with entirely different properties is called a chemical reaction. A chemical reaction is represented by a chemical equation. Substance(s) taking part Reactant(s) New substance(s) obtained Product(s) Combination Reaction (or Synthesis) Decomposition Reaction Displacement Reaction Double Displacement Reaction E.g.:- Fe(s) + S(s) FeS(s) NH3(g) + HCl(g) NH4Cl(g) A + B + .. C + D + .. Types of Chemical Reactions Two substances combine to form a single substance Combination Reaction (or Synthesis) A + B AB E.g.:- 2Hgo(s) 2Hg + O2 2AgCl 2Ag + Cl2 Decomposition reaction One substance breaks down into two or more simple ones E.g.:- Zn + CuSO4(aq) ZnSO4(aq) + Cu 2Na + 2H2O 2NaOH + H2 AB + C CB + A C displaces A from its molecule. Displacement Reaction Double Displacement Reaction AB + CD CB + AD E.g.:- AgNO3(aq) + HCl AgCl + HNO3 CuO + HNO3 Cu(NO3)2 + H2O Two compounds in their aqueous state displace ions or radicals.
  • 2. A chemical reaction in which a base or alkali reacts with an acid to produce salt and water. Exothermic Reaction Endothermic Reaction A Chemical reaction in which heat is released. A Chemical reaction in which heat is absorbed. Oxides Metallic Oxides Non- Metallic Oxides Amphoteric Oxides: Oxides which are of dual nature and react with both bases and acids to produce salt and water. Eg. Zinc, Lead, Aluminium Oxide. Non-Metallic Oxides Neutralization Reaction Acid + Base/Alkali Salt + Water Metal Reactivity Series Types of reactions based on energy exchange Basic Oxides : Most of the metallic-oxides are basic in nature and react with acids to produce salt and water. Eg. Sodium, Calcium, Magnesium Oxide. Formed on heating metals Some are formed on heating metallic, cabonates, nitrates, etc. Metallic Oxides Acidic Oxides : Most of the non-metallic oxides are acidic in nature and react with bases to produce salt and water. Eg. Carbon, Sulphur dioxide, Phosphorus Pentoxide. Formed on heating non-metals Neutral Oxides : Oxides which are neutral in nature and do not change the colour of indicators. Eg. Water, nitric, nitrous oxide.