Chemistry 11 · Chemistry · Lesson 5.4
Predicting the products of chemical reactions
- Level
- Grade 11
- Reading time
- 11 min reading
- Review
- Last reviewed 2026-09-03
- Standard
- Accuracy standard
- Errata
Abstract
Synthesis, decomposition, single/double replacement, neutralization, combustion.
What are the main types of chemical reactions?
Short answer
The common reaction types are synthesis (combination), decomposition, single replacement, double replacement, and combustion. Synthesis combines simpler substances into one; decomposition breaks one into simpler ones; single and double replacement exchange ions between reactants; and combustion reacts a fuel with oxygen to release energy. Recognizing the type helps you predict products.
Concept preview
What you will be able to do
- 01Classify a reaction into one of the five types
- 02Predict the products of a synthesis, decomposition or replacement reaction
- 03Write the products of hydrocarbon combustion and neutralization
Many reactions fall into five patterns, each recognised by the kind of reactants present. Being able to name the type lets you predict the products. The five are synthesis (combination), decomposition, single replacement, double replacement (including neutralization) and combustion of a hydrocarbon. Look at the reactants first: two elements suggest synthesis, a single compound suggests decomposition, an element plus a compound suggests single replacement, two compounds suggest double replacement, and a hydrocarbon with oxygen means combustion.
School Plan
Predicting the products of chemical reactions
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Related topics
Frequently asked questions
- How do you identify a reaction type?
- Look at how many reactants and products there are and how atoms rearrange — e.g. two reactants forming one product is synthesis.