Science 6 · Unit 2: Materials: properties and changes · Cambridge Primary Science Stage 6

Questions

1. 1. What is the melting point of a substance?

   • the temperature at which a solid becomes a liquid
   • the time it takes to melt
   • how hot a fire is
   • the temperature at which a liquid becomes a gas
   Check

2. 2. What is the boiling point of a substance?

   • the temperature at which particles throughout a liquid change to a gas
   • the temperature at which a solid melts
   • the temperature of steam only
   • the temperature of a cooker
   Check

3. 3. What is the melting point of gold?

   • 0 °C
   • 1064 °C
   • 100 °C
   • 60 °C
   Check

4. 4. What is the boiling point of vinegar?

   • 100 °C
   • 300 °C
   • 0 °C
   • 118 °C
   Check

5. 5. Why is melting point a property of a substance?

   • It depends on the size of the piece.
   • All substances melt at the same temperature.
   • Each substance has its own melting point that helps tell it apart.
   • It changes every day.
   Check

6. 6. Would the melting point change if you heated more of a substance?

   • Yes, it gets lower.
   • Yes, it doubles.
   • No, the melting point stays the same.
   • Yes, it gets higher.
   Check

7. 7. How is boiling different from evaporation?

   • Boiling happens at any temperature.
   • Boiling happens throughout the liquid; evaporation only at the surface.
   • They are the same.
   • Evaporation only happens at 100 °C.
   Check

8. 8. At what temperature can evaporation happen?

   • at any temperature
   • only below 0 °C
   • only at the boiling point
   • only at 100 °C
   Check

9. 9. Which is faster, boiling or evaporation?

   • boiling
   • evaporation
   Check

10. 10. Why is a substance's melting point always lower than its boiling point?

    • They are always equal.
    • Solids are always hotter.
    • Boiling needs less heat.
    • It must melt into a liquid before it can boil.
    Check

11. 11. Water boils at 100 °C, olive oil at 300 °C, vinegar at 118 °C. Which boils at the highest temperature?

    • olive oil
    • vinegar
    • they are the same
    • water
    Check

12. 12. Why is boiling oil more dangerous than boiling water?

    • Oil is a gas.
    • Oil is colder.
    • Oil boils at a much higher temperature.
    • Water is sticky.
    Check

13. 13. Which two properties do all matter, including gases, have?

    • It is shiny and flexible.
    • It is visible and hard.
    • It is cold and wet.
    • It takes up space and has mass.
    Check

14. 14. Two balloons balance on a ruler. Air is let out of one. What happens?

    • Both balloons float away.
    • The side with the full balloon goes down.
    • Nothing changes.
    • The side with the empty balloon goes down.
    Check

15. 15. How does a blown-up balloon show that gases take up space?

    • It shows nothing.
    • The air inside makes the balloon bigger.
    • The balloon gets colder.
    • The balloon changes colour.
    Check

16. 16. What is the melting point of candle wax?

    • about 1064 °C
    • about 0 °C
    • about 300 °C
    • about 60 °C
    Check