Q1
What is a combination reaction?
ASubstances combining into one product
BOne substance breaking apart
CAn element replacing another
DNo reaction occurring
ICSEClass 8 (ICSE)ScienceCh 14 · Topic 2
Practice and Revision - Chemical Reactions
Let us practise and revise what we learned about chemical reactions. Chemical reactions involve substances (reactants) transforming into new
Core concept
A combination reaction occurs when two or more substances combine to form one product, like hydrogen and oxygen forming water.
How it works
A decomposition reaction occurs when one substance breaks down into two or more simpler substances, like water breaking into hydrogen and oxygen with electricity.
Why it matters
A displacement reaction occurs when a more reactive element replaces a less reactive one in a compound, like iron displacing copper from copper sulfate.
Key detail
Understanding reaction types helps us predict outcomes and identify patterns in how substances interact chemically.
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Quick notes
• Reactants transform into products.
• Combination reaction: substances combine into one product.
• Example: hydrogen + oxygen forms water.
• Decomposition reaction: one substance breaks into simpler ones.
• Example: water breaking into hydrogen and oxygen.
• Displacement reaction: reactive element replaces less reactive one.
• Example: iron displacing copper.
• Understanding types helps predict reaction outcomes.