Combination Reaction
A combination reaction is a reaction in which two or more substances combine to form one product.
Practice This ConceptMain explanation
Teacher explanation
This type of reaction is easy to spot because the number of products is one. Many combination reactions release heat or light, so the mixture may feel warm or appear bright. The product is usually a single new substance.
Example
When quicklime reacts with water to form slaked lime, one product is formed.
Simple analogy
Combine means many to one.
Common confusion
Students think any reaction with heat is combination. Heat release alone does not decide the reaction type.
Exam tip
Check the number of products first. If one product forms from multiple reactants, combination is likely.
Answer writing and exam use
1-mark use
Write the exact meaning of combination reaction in one clean line.
2-mark use
Define combination reaction and add one example or condition.
3-mark use
Explain combination reaction, show the method or example, and mention the common mistake.
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