Science 3 · Unit 2: Mixing materials · Cambridge Primary Science Stage 3

Questions

1. 1. Sugar is stirred into water and seems to disappear. What has happened?

   • It has floated away.
   • It has turned into sand.
   • It has gone forever.
   • It has dissolved but is still there.
   Check

2. 2. What word describes a solid that dissolves in a liquid?

   • soluble
   • insoluble
   • transparent
   • magnetic
   Check

3. 3. What word describes a solid that does not dissolve in a liquid?

   • soluble
   • transparent
   • insoluble
   • liquid
   Check

4. 4. Is sand soluble or insoluble in water?

   • soluble
   • insoluble
   Check

5. 5. Is salt soluble or insoluble in water?

   • soluble
   • insoluble
   Check

6. 6. Is salt soluble or insoluble in cooking oil?

   • soluble
   • insoluble
   Check

7. 7. What does transparent mean?

   • It is a gas.
   • It is dark.
   • You can see through it.
   • It dissolves.
   Check

8. 8. A coloured sweet dissolves in water. What happens to the water?

   • It goes cloudy and you can't see through it.
   • Nothing happens.
   • It turns into a solid.
   • It stays transparent but changes colour.
   Check

9. 9. Which mixture is easier to separate?

   • sand in water
   • sugar in water
   Check

10. 10. Salt is added to a small, a medium and a large glass of water. Which dissolves the most salt?

    • the small glass
    • the large glass
    • the medium glass
    • they all dissolve the same
    Check

11. 11. Zara and Marcus's results: cold water 1, warm 3, hot 5 teaspoons of sugar. How many more dissolved in hot than cold?

    • 4
    • 6
    • 5
    • 2
    Check

12. 12. Zara and Marcus's results: cold 1, warm 3, hot 5 teaspoons. Does more sugar dissolve when the water is warmer?

    • Yes
    • No
    Check

13. 13. In Zara and Marcus's fair test, what was the one thing they changed?

    • the size of the spoon
    • the temperature of the water
    • the amount of water
    • the type of sugar
    Check

14. 14. In a fair test about which liquids salt dissolves in, what do you change?

    • the size of the cup
    • the liquid
    • the amount of stirring
    • the solid
    Check

15. 15. What should you never do in a science investigation with liquids?

    • wipe up spills
    • wear safety glasses
    • taste them
    • listen to the teacher
    Check