Science 5 · Unit 3: States and properties of matter · Cambridge Primary Science Stage 5

Questions

1. 1. Which process makes ice become liquid on a hot day?

   • freezing
   • melting
   • boiling
   • condensing
   Check

2. 2. Which shows melting?

   • liquid − heat → solid
   • gas − heat → liquid
   • solid + heat → liquid
   • liquid + heat → gas
   Check

3. 3. Which shows boiling?

   • gas + heat → liquid
   • liquid + heat → gas
   • liquid − heat → gas
   • solid + heat → liquid
   Check

4. 4. What is the melting point of ice?

   • 0 °C
   • 100 °C
   • 50 °C
   • 10 °C
   Check

5. 5. What is the boiling point of pure water?

   • 0 °C
   • 50 °C
   • 100 °C
   • 37 °C
   Check

6. 6. What is steam?

   • liquid water
   • ice
   • heated water vapour
   • smoke
   Check

7. 7. What do we use to measure temperature?

   • a thermometer
   • a ruler
   • a sound level meter
   • a forcemeter
   Check

8. 8. What happens to particles when a solid is heated?

   • They lose energy and slow down.
   • They gain energy, move faster and spread apart.
   • They disappear.
   • They get bigger.
   Check

9. 9. Ice is added to water. What happens to the water temperature until all the ice has melted?

   • It changes colour.
   • It goes up quickly.
   • It goes down and stays low.
   • It boils.
   Check

10. 10. Why does ice melt at the same temperature at which water freezes?

    • It is a coincidence.
    • Water never freezes.
    • Ice is not made of water.
    • It is the same change of state, just in the other direction.
    Check

11. 11. Why does water not always boil at exactly 100 °C?

    • Water changes every day.
    • It depends on the colour of the pan.
    • It often has other substances mixed in, or is high above sea level.
    • Thermometers are always wrong.
    Check

12. 12. Why can't you cook a hard-boiled egg properly on Mount Everest?

    • Eggs freeze there.
    • Pans don't work there.
    • There is no water.
    • Water boils at a lower temperature high up, so it is not hot enough.
    Check

13. 13. What happens to most substances when they are heated?

    • They get heavier.
    • They disappear.
    • They contract.
    • They expand.
    Check

14. 14. What do we call it when a substance gets smaller as it cools?

    • boiling
    • contracting
    • expanding
    • melting
    Check

15. 15. What is unusual about water when it freezes?

    • It turns into a gas.
    • It disappears.
    • It boils.
    • It expands instead of contracting.
    Check

16. 16. Why does ice float?

    • Ice is not made of water.
    • Water expands when it freezes.
    • Ice is heavier than water.
    • Ice is full of air from bubbles only.
    Check

17. 17. When water boils, where do the bubbles form?

    • throughout the liquid, not just on the surface
    • only on the surface
    • nowhere
    • only at the very top of the pan
    Check