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

Questions

1. 1. What happens when sugar dissolves in tea?

   • The sugar turns into tea.
   • The sugar disappears forever.
   • The sugar particles spread out between the tea particles.
   • The sugar sinks as crystals.
   Check

2. 2. In a sugar solution, what is the sugar called?

   • the solvent
   • the solution
   • the mixture
   • the solute
   Check

3. 3. In a sugar solution, what is the water called?

   • the solute
   • the crystal
   • the precipitate
   • the solvent
   Check

4. 4. What does a solution always contain?

   • a solute and a solvent
   • sand and water
   • only a gas
   • only a solid
   Check

5. 5. Why is water called the universal solvent?

   • It never dissolves anything.
   • It is found in space.
   • It is a solid.
   • So many substances can dissolve in it.
   Check

6. 6. Which mixture is a solution?

   • sand and water
   • flour and water
   • rice and beans
   • coffee and hot water
   Check

7. 7. What does 'uniform appearance' mean for a solution?

   • It looks the same throughout.
   • It is always clear with no colour.
   • It has layers.
   • It has lumps.
   Check

8. 8. Why is a solution a mixture?

   • It is a pure substance.
   • Its particles are mixed but not chemically joined.
   • It has only one substance.
   • It is a new material that can't be separated.
   Check

9. 9. How can you get salt back from sea water?

   • use a magnet
   • freeze it
   • let the water evaporate
   • filter it
   Check

10. 10. Why is dissolving called a reversible process?

    • We can get back the dissolved solute.
    • It makes a new substance.
    • It only happens once.
    • It can never be undone.
    Check

11. 11. Why can't we always see water pollution?

    • Water hides it in bubbles.
    • Pollution is always bright.
    • It only happens at night.
    • Some pollutants are dissolved in the water.
    Check

12. 12. Which is a soluble substance that can pollute water?

    • sand
    • oil
    • plastic bags
    • fertiliser
    Check

13. 13. Which is an insoluble substance that can pollute water?

    • sugar
    • fertiliser
    • plastic
    • salt
    Check

14. 14. How can pesticides pollute rivers?

    • They turn into rocks.
    • They dissolve in rainwater and are washed into rivers.
    • They float up into clouds only.
    • They are eaten by fish safely.
    Check

15. 15. Sofia stirs coffee powder into hot water. How can she get the powder back?

    • filter it
    • stir it more
    • evaporate the water
    • add more water
    Check

16. 16. Marcus adds more and more sugar until no more dissolves. What happens to the extra sugar?

    • It stays as solid at the bottom.
    • It turns into water.
    • It disappears.
    • It evaporates.
    Check

17. 17. Without tasting it, how can you show that dissolved sugar is still in the water?

    • look for lumps
    • shine a light on it
    • filter it
    • evaporate the water and look for sugar crystals
    Check