Class 10 / Science
Class 10 Science Chemical Reactions Worksheet
Practice chemical equations, balancing, and identifying reaction types.
advanced40 minutesAnswer key included
Learning objective
Practise balancing equations, identifying reaction types, and writing observations for chemical changes.
Questions
- Why must chemical equations be balanced?
- Balance: H2 + O2 -> H2O.
- Identify the reaction type: CaO + H2O -> Ca(OH)2.
- Write two signs of a chemical reaction.
- What is a decomposition reaction?
Answer key
Show suggested answers
- Chemical equations must be balanced because atoms are neither created nor destroyed in a chemical reaction, so mass is conserved.
- Balanced equation: 2H2 + O2 -> 2H2O.
- CaO + H2O -> Ca(OH)2 is a combination reaction because two reactants form one product.
- Two signs are evolution of gas, change in colour, change in temperature, formation of precipitate, or change in state.
- A decomposition reaction is a reaction in which one compound breaks down into two or more simpler substances.
How to use this worksheet
Students can solve the questions independently first, then review errors with a parent or teacher. Teachers can use it as a short class activity, homework sheet, or revision check.
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