What's covered
Acids, alkalis and pH10
Chemical reactions and equations10
Combustion10
Energetics (exothermic / endothermic)10
Reactivity of metals10
Sample questions
A taste of the 50 questions in this topic — answers marked. Sign up to practise the full set with spaced repetition.
1Acids, alkalis and pH
What is the pH range of acids?
- •Above 14
- •Above 7
- ✓Below 7
- •Exactly 7
2Chemical reactions and equations
What is a chemical reaction?
- •Liquids change state only
- •Particles split into atoms
- ✓Reactants change into new products
- •Same substances move around
3Combustion
What is combustion?
- ✓Burning a fuel in oxygen, releasing energy
- •Cooling a hot fuel down by half temperature
- •Iron rusting slowly in damp air outdoors
- •Salt dissolving steadily in warm water
4Energetics (exothermic / endothermic)
What is an exothermic reaction?
- •A reaction at high pressure
- •A reaction that absorbs energy
- ✓A reaction that releases energy
- •A reaction without any products
5Reactivity of metals
Which is the most reactive metal in the list?
- •Copper metal
- •Gold metal
- •Iron metal
- ✓Potassium
6Acids, alkalis and pH
What is the pH range of alkalis?
- ✓Above 7
- •Below 0
- •Below 7
- •Exactly 7
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