Chapter 1: Chemical Reactions and Equations (CBSE Class 10 Science)
What is a Chemical Reaction?
A chemical reaction is a process in which reactants are transformed into products through the breaking and
forming of bonds.
Key Points:
Reactants: Substances that start a chemical reaction.
Products: Substances that are formed as a result of a chemical reaction.
Chemical reactions are usually accompanied by changes like the release of energy, light, heat, gas, or change in
color.
Types of Chemical Reactions
Combination Reaction:
When two or more substances combine to form a single product.
Example:
𝐴
+
𝐵
→
𝐴
𝐵
A+B→AB
Example:
2
𝐻
2
+
, 𝑂
2
→
2
𝐻
2
𝑂
2H
2
+O
2
→2H
2
O (Hydrogen + Oxygen → Water)
Decomposition Reaction:
A single compound breaks down into two or more simpler substances.
Example:
𝐴
𝐵
→
𝐴
+
What is a Chemical Reaction?
A chemical reaction is a process in which reactants are transformed into products through the breaking and
forming of bonds.
Key Points:
Reactants: Substances that start a chemical reaction.
Products: Substances that are formed as a result of a chemical reaction.
Chemical reactions are usually accompanied by changes like the release of energy, light, heat, gas, or change in
color.
Types of Chemical Reactions
Combination Reaction:
When two or more substances combine to form a single product.
Example:
𝐴
+
𝐵
→
𝐴
𝐵
A+B→AB
Example:
2
𝐻
2
+
, 𝑂
2
→
2
𝐻
2
𝑂
2H
2
+O
2
→2H
2
O (Hydrogen + Oxygen → Water)
Decomposition Reaction:
A single compound breaks down into two or more simpler substances.
Example:
𝐴
𝐵
→
𝐴
+
