The document discusses the four main types of chemical reactions: 1) Combination reactions involve two or more reactants combining to form a single product. 2) Decomposition reactions involve a single reactant breaking down into simpler products. 3) Substitution reactions involve a more active element replacing a less active one in a compound. 4) Double displacement reactions involve the exchange of ions between two compounds resulting in the formation of two new compounds.

1. Types of
Chemical
Reactions

2. Chemical reaction
• Chemical reaction is a process in which
one or more pure substances are
converted into one or more different pure
substance.

3. Types of Chemical Reaction
1. Combination Reaction- a reaction when two (2)
or more reactants combine to form a single
product.
General formula: A+B 🡺 AB
EXAMPLE: H2 (g) + O (g) = H2O (l)
A + B = AB

4. Types of Chemical Reaction
2. Decomposition Reaction- in this reaction, a
single reactant breaks down into simpler ones. (2
or more products). This is the reverse of
combination reaction.
General formula: AB = A+B
• Examples: heat
2 HgO (s) = 2 Hg(g) + O2 (g)
AB = A + B

5. Types of Chemical Reaction
3. Substitution Reaction- it is also called as single
displacement reaction. In this reaction, a more active
element replaces a less active element in the compound.
General formula: A+BC 🡺 AC + B
a. Displacement reaction in metals
In a metal displacement reaction, a more active metal kicks out a
less active metal from a compound.
• Example:
Fe (s) + CuSO4 (aq) = FeSO4 (aq) + Cu (s)
A + BC = AC + B

6. b. Displacement Reaction in Halogen
Just like in metals, more active halogens will displace
less active halogens from a compound.
• Example:
Cl2 (g) + 2 NaI (aq) = 2 NaCl (aq) + I2 (s)
A + BC = BA + C
c. Hydrogen Displacement
• Hydrogen can also be displaced from compounds by all
alkali metals and even some alkaline earth metals.
• Examples:
2 Na (s) + 2 H2O (l) = 2 NaOH (aq) + H2 (g)
A + B C = A C + B

7. Types of Chemical Reaction
4. Double Displacement Reaction- it is
characterized by the exchange of ions between
two compounds.
General formula: AB+CD AD+CB
Examples:
HCl (aq) + NaOH (aq) = NaCl (aq) + H2O (l)
A B + C D = A D + C B

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