Science 4 · Unit 3: Materials · Cambridge Primary Science Stage 4

Questions

1. 1. Sofia puts water into an ice tray and puts it in the freezer. In what state is the water when it goes in?

   • liquid
   • ice
   • gas
   • solid
   Check

2. 2. In what state will the water be when Sofia takes the ice tray out of the freezer?

   • gas
   • liquid
   • steam
   • solid
   Check

3. 3. What must happen to the water for it to change into ice?

   • It must be cooled.
   • It must be heated.
   • It must be stirred.
   • It must be poured.
   Check

4. 4. Sofia heats butter in a pan. In what state is the butter before she heats it?

   • gas
   • solid
   • melted
   • liquid
   Check

5. 5. In what state will the butter be after heating?

   • solid
   • gas
   • frozen
   • liquid
   Check

6. 6. What is the change from solid butter to liquid butter called?

   • melting
   • freezing
   • solidifying
   • cooling
   Check

7. 7. When ice cream becomes liquid on a hot day, it is ...

   • freezing
   • melting
   • solidifying
   • cooling
   Check

8. 8. Which shows melting?

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

9. 9. Which shows freezing?

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

10. 10. Solids melt because ...

    • their particles gain energy and break away from the solid.
    • their particles are not moving fast enough to stay in the solid.
    • new liquid particles form when the solid is heated.
    • solids cannot keep their shape when heated.
    Check

11. 11. The opposite of ice melting is ...

    • flowing
    • thawing
    • cooling
    • solidifying
    Check

12. 📖 This question is about a text that students read in the app.

    12. At which water temperature did the ice melt quickest?

    • 10 °C
    • 60 °C
    • 80 °C
    • 40 °C
    Check

13. 📖 This question is about a text that students read in the app.

    13. At which water temperature did the ice take the longest to melt?

    • 80 °C
    • 20 °C
    • 10 °C
    • 40 °C
    Check

14. 📖 This question is about a text that students read in the app.

    14. How long did the ice take to melt in water at 40 °C?

    • about 7 minutes
    • about 13 minutes
    • about 22 minutes
    • about 19 minutes
    Check

15. 15. Which would help make Arun's test fair?

    • using ice cubes of the same size and the same amount of water
    • using a bigger ice cube in the hotter water
    • using different amounts of water each time
    • timing some cubes and guessing others
    Check

16. 📖 This question is about a text that students read in the app.

    16. What conclusion can Arun write?

    • The hotter the water, the faster the ice melts.
    • The hotter the water, the slower the ice melts.
    • The water temperature makes no difference.
    • Ice does not melt in cold water.
    Check

17. 17. Use the particle model. Why does ice melt faster in hotter water?

    • Hotter water transfers more heat energy, so the ice particles break away faster.
    • Hotter water has fewer particles.
    • Cold water gives the ice more energy.
    • Hot water makes new particles in the ice.
    Check

18. 18. If Arun crushed each ice cube first, how would the melting time change?

    • It would be shorter.
    • It would be longer.
    • It would stay the same.
    Check

19. 19. Which is a safe way to work in Arun's investigation?

    • Test the water temperature with your finger.
    • Be careful with hot water, and wipe up spills.
    • Fill the beakers right to the top.
    • Run around while carrying the beakers.
    Check