Starter quiz
- Which of the following are compounds?
- O₂
- NaCl ✓
- Potassium
- Water ✓
- Silicon dioxide ✓
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- In a chemical reaction, what are the substances called that start the reaction?
- 'reactants' ✓
- True or false?: A physical change alters the chemical composition of the substance.
- True
- False ✓
- Which of the following statements best describes a chemical change?
- Ice melting into water
- Water boiling into steam
- Paper burning into ash ✓
- Sugar dissolving in water
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- What is the term for a substance that does not dissolve in water?
- Soluble
- Insoluble ✓
- Miscible
- Desirable
- Unchangeable
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- Name this chemical: MgO
- magnesium oxygen
- magnesium oxide ✓
- oxomagnesia
- oxymagnesium
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Exit quiz
- What does the "+" symbol represent in a chemical equation?
- Plus
- And ✓
- Or
- Equals
-
- In an oxidation reaction, what chemical substance does a reactant combine with?
- 'oxygen' ✓
- What is produced in a decomposition reaction?
- A single new substance
- Two or more new substances ✓
- An insoluble salt
- Oxygen
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- In a chemical equation the ______ signifies "changes into", indicating the transformation of reactants into products.
- 'arrow' ✓
- A reaction that forms an insoluble salt when two solutions are mixed is called a ______ reaction.
- 'precipitation' ✓
- Which of the following are oxidation reactions?
- H₂ + O₂ → H₂O ✓
- CaCO₃ → CaO + CO₂ ✓
- 2Mg + O₂ → 2MgO ✓
- NaCl + AgNO₃ → AgCl + NaNO₃
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Worksheet
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Lesson Details
Key learning points
- In a chemical reaction the + symbol can be read as ‘and’ and the arrow as ‘changes into’.
- In an oxidation reaction a reactant combines with oxygen.
- In a decomposition reaction a reactant splits into two or more new substances.
- In a precipitation reaction an insoluble salt is formed.
Common misconception
Pupils *very* easily confuse different types of reactions.
Spend time developing ways to help pupils remember the differences and regularly challenge them to explain why one reaction is the type it is.
Keywords
Chemical equation - A chemical equation describes a reaction, indicating the reactants and products.
Oxidation - Oxidation is a type of reaction in which oxygen bonds to elements of the reactants.
Decomposition - Decomposition is a type of reaction in which a reactant compound breaks down into two or more products.
Precipitation - A reaction in which an insoluble salt forms from two solutions is called a precipitation reaction.
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