This document outlines the 5 main types of chemical reactions: 1) Synthesis reactions involve combining two or more substances to form a single product. 2) Decomposition reactions involve a single reactant breaking down into multiple products. 3) Single replacement reactions involve one element replacing another in a compound. 4) Double replacement reactions involve ion exchange between two compounds in solution. 5) Combustion reactions involve oxidation, producing energy, carbon dioxide, and water when oxygen reacts with a fuel.

1. The 5 Types of
Chemical Reactions

2.  Also known as – Combination reaction
 It is a chemical change in which two or more
substances react to forma new singular
substance.
 The product is a compound in this form of
reaction.
 You can tell this reaction has occurred because
on the reactant side there are multiple
substances, while on the product side there is
only one product.
1. Synthesis Reactions

3. Synthesis Reaction
A + B AB

4.  When a single compound (the reactant) breaks
down into two or more simpler products.
 This type of reaction can be identified by:
 It is the exact opposite of a synthesis
reaction; if you know one you know them
both.
 There is always one reactant. If you see one
reactant that’s a compound and several
products, a decomposition reaction has
occurred.
2. Decomposition Reactions

5. Decomposition Reaction
AB A+B

6.  A chemical change where one element replaces
a second element in compound
 This reaction is identifiable by its symmetry.
On the reactant side there is a single element
and a compound, as there is on the product
side
 No reaction will occur if the most reactive
element is already in the compound
3. Single Replacement Reactions

7. Single Replacement Reaction
A + BC AC + B

8.  A chemical change where there is an exchange
of positive ions between two compounds
 May also be called double-displacement
reactions
 Generally occurs in aqueous solution
 Often produces a precipitate,a gas, or a
molecular compound, water for example.
4. Double Replacement Reactions

9. AB + CD AD + BC
Double Replacement Reactions

10.  A chemical change where an element or a compound
reacts with oxygen.
 This will often yield energy in the form of heat and
light.
 Oxygen is ALWAYS going to be on the reactant side
of the equation. This is the main indicator that a
combustion reaction has occurred.
5. Combustion Reactions

11. Combustion Reaction
CH4 + O2 CO2 + H2O + energy
Methan
e
Carbon
Dioxide
Oxygen Water
CH4 + 2O2 CO2 + 2H2O + energy
Balanced combustion reaction

12. Practice Problems
What type of reaction is this?
AgNO3(aq) + KCl(aq) AgCl(s) + KNO3(aq)

13. Practice Problems
What type of reaction is this?
AgNO3(aq) + KCl(aq) AgCl(s) + KNO3(aq)
 This is a Double-Replacement reaction. You can tell
this because there are two compounds on each side
of the equation and each compound swapped the
latter of the 2 elements.

14. What type of reaction is this?
Br2(l) + 2NaI(s) 2NaBr(s) + I2(s)
 This is a Single-Replacement reaction. You can tell
this because there is a single element on the reactant
side Br2(l). Br2(l) becomes part of the compound on
the product side 2Nabr(s).
Practice Problems

15. Practice Problems
Fill in the blank:
CH4 + ___ CO2 + H2O

16. Fill in the blank:
CH4 + ___ CO2 + H2O
 The answer is O2 because this is a Combustion reaction.
You can identify this as a combustion reaction because:
 Oxygen is on the product side, which means it is
most likely on the reactant side as well.
 Carbon dioxide was formed, a common product in
combustion reactions.
Practice Problems

17. What type of reaction is this?
Br2(aq) + NaCl(aq)
Practice Problems

18. What type of reaction is this?
Br2(aq) + NaCl(aq)
 This is a trick question! There will be no reaction
because Bromine is less reactive than Chlorine.
Remember, if the most reactive element is already in
the compound, there will be NO chemical reaction.
Practice Problems

19. Quiz Yourself
Answer the following question with
either: Always, Frequently, or Never
1. In a combustion reaction, oxygen is ________ on
the reactant side.
1. In a synthesis reaction, there are ________ two or
more products.
1. A decomposition reaction ________ requires energy
in the form of heat, light, or electricity.

20. Quiz Yourself
Answer the following question with
either: Always, Frequently, or Never
1. In a combustion reaction, oxygen is ALWAYS on
the reactant side.
1. In a synthesis reaction, there are NEVER two or
more products.
1. A decomposition reaction FREQUENTLY requires
energy in the form of heat, light, or electricity.