Science
Matter & Materials
Conceptual
12–13 yrs
Types of Chemical Reaction
化学反应类型
Description
Identify and describe four types of chemical reaction: combustion (burning in oxygen), oxidation (gain of oxygen), thermal decomposition (breaking down by heat), and displacement (more reactive metal replaces less reactive one)
Mastery Evidence
- Writes a word equation for each type of reaction with an example
- Identifies the type of reaction from a given word equation or description
- Explains what makes a displacement reaction happen (relative reactivity)
- Distinguishes complete combustion (CO₂ and H₂O) from incomplete combustion (CO and soot)
Assessment Prompt
If your child saw iron going rusty and a candle burning, could they explain what type of chemical reaction is happening in each case — and write a simple word equation for one of them?
