Science 7 · Unit 2: Materials and their structure · Cambridge Lower Secondary Science Stage 7

Questions

1. 1. Zara needs flour, sugar, beaten eggs, water and food colouring for her cake. Which two are solids?

   • flour and sugar
   • beaten eggs and water
   • sugar and food colouring
   • flour and beaten eggs
   Check

2. 2. Zara needs flour, sugar, beaten eggs, water and food colouring for her cake. Which three are liquids?

   • flour, sugar and water
   • beaten eggs, water and food colouring
   • sugar, water and food colouring
   • flour, beaten eggs and sugar
   Check

3. 3. Zara also has these items: water, a cooking pan, a butane gas burner, air, a flame and a candle. Which one is a gas?

   • the cooking pan
   • the candle
   • air
   • water
   Check

4. 4. Which property belongs only to gases?

   • It can be compressed easily.
   • It keeps its own shape.
   • It keeps the same volume.
   • It flows.
   Check

5. 5. Which property belongs only to solids?

   • It flows.
   • It can be compressed.
   • It keeps its own shape.
   • It keeps the same volume.
   Check

6. 6. A material flows, takes the shape of its container and keeps the same volume. It cannot be compressed. What state is it?

   • solid
   • gas
   • liquid
   Check

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

   7. Look at Arun's results. Is material A a solid, a liquid or a gas?

   • a gas, because it can be compressed and it flows
   • a solid, because it can be compressed
   • a liquid, because it flows
   • a liquid, because it can be compressed
   Check

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

   8. Look at Arun's results. Is material B a solid, a liquid or a gas?

   • a solid, because its volume stays the same
   • a liquid, because it flows and its volume stays the same
   • a gas, because it flows
   • a gas, because its volume stays the same
   Check

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

   9. Arun thinks material C is either a liquid or a gas. Which one other test should he carry out to find out which it is?

   • Does it flow? Both liquids and gases flow.
   • Can it be compressed? A gas can be compressed, but a liquid cannot.
   • Is it see-through? All gases are see-through.
   • Is it heavy? Liquids are heavier than gases.
   Check

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

    10. Arun thinks material D is a liquid. Is he correct?

    • Yes, because D can be compressed.
    • No, because a liquid cannot flow.
    • No, because D could be a solid.
    • Yes, because D flows and its volume stays the same.
    Check

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

    11. Arun knows that material E is not a gas. How does he know?

    • E does not flow, and all gases flow.
    • E is heavy, and gases are light.
    • The volume of E stays the same, but a gas does not keep the same volume.
    • E can be compressed, and gases cannot.
    Check

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

    12. What test should Arun do to decide if material E is a liquid or a solid?

    • Is it heavy?
    • Can it be compressed?
    • Does it flow?
    • Does the volume stay the same?
    Check

13. 13. Marcus pours flour from a bag. Which states of matter can usually be poured?

    • liquids and gases
    • solids only
    • solids and liquids
    • gases only
    Check

14. 14. Marcus pours flour, and it takes the shape of its container. Which states of matter usually behave like this?

    • solids only
    • liquids and gases
    • solids and liquids
    • gases only
    Check

15. 15. When Marcus taps the container, the flour takes up less space. Which state of matter can usually be squashed like this?

    • a liquid
    • a gas
    • a solid
    • all three states
    Check

16. 16. Flour is a solid, but you can pour it like a liquid. Why?

    • It is made of tiny solid grains that can slide past each other.
    • Flour has air particles inside that make it flow.
    • Flour is really a liquid.
    • The flour melts when you pour it.
    Check

17. 17. When you tap a jar of flour, the flour takes up less space. Why?

    • The grains settle closer together, pushing out some of the air between them.
    • The solid grains get smaller.
    • Tapping makes the flour melt.
    • The flour turns into a gas.
    Check