iStarSign inScience 7 · Unit 5: Properties of materials · Cambridge Lower Secondary Science Stage 7
5.4 Using the properties of materials to separate mixtures
17 questions · e.g. Separate sand, salt and water
Questions
1. Which piece of equipment would Zara NOT need to separate the sand, salt and water?
Check2. Which piece of equipment holds the filter paper?
Check3. Which equipment holds an evaporating basin over a Bunsen burner?
Check4. Zara has a mixture of sand, salt and water. How can she separate the sand?
Check5. After filtering, what is left in the filter paper?
Check6. After filtering, how can Zara get the salt from the salty water?
Check7. What should Zara be careful about when evaporating the salt solution?
- The water might freeze.
- The filter paper might melt.
- The salt might become magnetic.
- The hot solution can spit, and the basin stays hot after heating.
8. What should Zara wear when she heats the salt solution?
Check9. How should Marcus pick up the broken glass and crystals from the floor safely?
- with a wet cloth
- with a dustpan and brush, not his hands
- with his bare hands
- by blowing it into a corner
10. Which property lets Marcus separate copper sulfate from broken glass?
- Copper sulfate dissolves in water, but glass does not.
- Glass is magnetic, but copper sulfate is not.
- Glass is heavier than copper sulfate.
- Copper sulfate is blue.
11. What is Marcus's first step to separate the crystals from the glass?
Check12. Marcus has dissolved the copper sulfate. How does he separate the broken glass?
- Use a condenser.
- Evaporate the water.
- Pour it into a measuring cylinder.
- Filter it, so the glass stays in the filter paper.
13. How does Marcus get clean, dry copper sulfate crystals back from the solution?
- Heat it to evaporate some water, leave it to crystallise, then dry the crystals on filter paper.
- Boil it until all the water is gone.
- Filter it again.
- Freeze the solution.
- Check
15. What happens to the steam in the condenser?
- It freezes into ice.
- It heats up and escapes.
- It turns into dye.
- It cools and condenses into pure water.
16. Why does cold water flow through the outside of the condenser?
Check17. What is separating a liquid by evaporation and then condensation called?
Check