8th Grade Integrated Science Chapter 9 Lesson 2 on Types of Chemical Reactions. This chapter explains five different types of reactions: synthesis, decomposition, single replacement, double replacement, and combustion.

1. Chapter 9.2: Types of Chemical Reactions – p311-315 – page 1
Vocabulary
 Synthesis (313) - A synthesis is a type of chemical reaction in which two or more substances
combine and form one compound.
 Decomposition (313) - In a decomposition reaction, one compound breaks down and forms
two or more substances.
 Single Replacement (314) - In a single-replacement reaction, one element replaces another
element in a compound.
 Double Replacement (314) - In a double-replacement reaction, the negative ions in two
compounds switch places, forming two new compounds.
 Combustion (314) - Combustion is a chemical reaction in which a substance combines with
oxygen and releases energy.
Types of Chemical Reactions
 There are many different types of reactions. Most fit into 4 major categories.
o _____________________
o _____________________
o _____________________
o _____________________
Synthesis
 A synthesis is a type of chemical reaction in which two or more substances combine and
form one_______________________.
 Example:


Decomposition Reactions
 In a decomposition reaction, one compound breaks down and forms two or
more________________________.
 So one reactant will form two or more______________________.
 The ___________________of synthesis.
o Example:



2. Chapter 9.2: Types of Chemical Reactions – p311-315 – page 2
Replacement Reactions
 Single-replacement
o In a single-replacement reaction, one element replaces another element in
a_____________________.
o In this reaction one element and a compound react and form a different element
and a different_______________.
o Example:

 Double-Replacement
o In a double-replacement reaction, the negative ____________ in two compounds
switch places, forming two new compounds.
o In this reaction you start with 2 compounds and end with two
_______________compounds.
o Example:


Combustion Reactions
 Combustion is a chemical reaction in which a substance combines with ______________and
releases energy.
 This energy usually is released as thermal energy and _______________energy.
 __________________is a common combustion reaction.