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

Questions

1. 1. Eggs, sugar and flour are baked into a cake. Is this a chemical reaction?

   • Yes
   • No
   Check

2. 2. Chocolate melts in the Sun. Is this a chemical reaction?

   • Yes
   • No
   Check

3. 3. Sand, limestone and soda ash are heated to make a glass bottle. Is this a chemical reaction?

   • Yes
   • No
   Check

4. 4. An iron nail goes rusty. Is this a chemical reaction?

   • Yes
   • No
   Check

5. 5. Sand is mixed with water. Is this a chemical reaction?

   • Yes
   • No
   Check

6. 6. True or false: Chemical reactions make new substances form.

   • True
   • False
   Check

7. 7. True or false: When butter melts, it is a chemical reaction.

   • True
   • False
   Check

8. 8. True or false: We cannot undo a chemical reaction.

   • True
   • False
   Check

9. 9. True or false: Making concrete is a chemical reaction.

   • True
   • False
   Check

10. 10. True or false: We need heat for chemical reactions to happen.

    • True
    • False
    Check

11. 11. True or false: A chemical reaction can happen with only one substance.

    • True
    • False
    Check

12. 12. Zara mixed baking powder with vinegar, and it bubbled and fizzed. Did a chemical reaction take place?

    • Yes, because the bubbles show a new substance, a gas, was made.
    • No, because nothing was heated.
    • No, because it was only mixing.
    • Yes, because the vinegar melted.
    Check

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

    13. What reacts with iron to form rust?

    • water and air
    • water only
    • oil and air
    • heat only
    Check

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

    14. In the rusting test, what happened to the iron nail in water with air above it (test tube A)?

    • It did not rust.
    • It melted.
    • It rusted.
    • It had very little rust.
    Check

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

    15. Why did the iron nail in dry air with a stopper (test tube C) not rust?

    • There was no water.
    • There was no air.
    • It was a steel nail.
    • It was covered in oil.
    Check

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

    16. Why was there very little rust on the iron nail in oil (test tube D)?

    • The nail was made of steel.
    • The oil heated the nail.
    • Oil makes iron stronger.
    • The oil kept water and air away from the nail.
    Check

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

    17. The stainless steel nail in water and air (test tube B) did not rust. What question could you investigate?

    • Do nails float in water?
    • Does oil make nails rust faster?
    • Does air have a colour?
    • Does the type of metal affect rusting?
    Check

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

    18. To make that test fair, which factors should you keep the same?

    • nothing at all
    • the colour of the test tubes only
    • the type of metal only
    • the size of the nails, the amount of water and air, and the time left
    Check

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

    19. To test whether the type of metal affects rusting, which factor should you change?

    • the size of the nails
    • the type of metal the nail is made of
    • how long the nails are left
    • the amount of water
    Check