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Heating and cooling

2nd grade (Year 3 in England) · 16 questions · Common Core: NGSS.2-PS1-4 · England: KS1 Y2 Uses of everyday materials, KS2 Y5 Properties and changes of materials

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1
Question 1
Can this change be undone: an ice lolly (popsicle) melting?
- A. can change back
- B. cannot change back
2
Question 2
Three of these changes CAN be undone. Which one is different?
- A. butter softening in a warm kitchen
- B. burning a log on a fire
- C. chocolate melting in a warm hand
- D. an ice lolly (popsicle) melting
3
Question 3
Ice cream is left in the sun and melts. Then it is put back in the freezer. Is it the same as before?
- A. It freezes solid again, though it may be icier and harder than before.
- B. It turns into milk powder.
- C. It stays a liquid in the freezer.
- D. It burns.
4
Question 4
Can this change be undone: frying an egg?
- A. can change back
- B. cannot change back
5
Question 5
Three of these changes CAN be undone. Which one is different?
- A. water freezing into ice cubes
- B. an ice lolly (popsicle) melting
- C. frying an egg
- D. butter softening in a warm kitchen
6
Question 6
Can you turn a fried egg back into a raw egg by putting it in the fridge?
- A. Yes, if you wait a day.
- B. Yes, cooling always undoes heating.
- C. No, cooking made a change that cannot be undone.
- D. Yes, but only for brown eggs.
7
Question 7
Can this change be undone: an ice lolly (popsicle) melting?
- A. can change back
- B. cannot change back
8
Question 8
Three of these changes CANNOT be undone. Which one is different?
- A. baking a cake
- B. burning a log on a fire
- C. popping popcorn
- D. chocolate melting in a warm hand
9
Question 9
Melted chocolate is poured into a mould and put in the fridge. What happens?
- A. It stays liquid for ever.
- B. It turns solid again, in the mould's shape.
- C. It turns into water.
- D. It turns into cake.
10
Question 10
Can this change be undone: toasting bread?
- A. can change back
- B. cannot change back
11
Question 11
Three of these changes CAN be undone. Which one is different?
- A. water freezing into ice cubes
- B. popping popcorn
- C. butter softening in a warm kitchen
- D. chocolate melting in a warm hand
12
Question 12
Melted chocolate is poured into a mould and put in the fridge. What happens?
- A. It stays liquid for ever.
- B. It turns into cake.
- C. It turns into water.
- D. It turns solid again, in the mould's shape.
13
Question 13
Can this change be undone: popping popcorn?
- A. can change back
- B. cannot change back
14
Question 14
Three of these changes CANNOT be undone. Which one is different?
- A. an ice lolly (popsicle) melting
- B. toasting bread
- C. baking a cake
- D. popping popcorn
15
Question 15
Melted chocolate is poured into a mould and put in the fridge. What happens?
- A. It turns solid again, in the mould's shape.
- B. It turns into cake.
- C. It turns into water.
- D. It stays liquid for ever.
16
Question 16
Can this change be undone: water freezing into ice cubes?
- A. can change back
- B. cannot change back

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Answer key: Heating and cooling

1. A. can change back
2. B. burning a log on a fire
3. A. It freezes solid again, though it may be icier and harder than before.
4. B. cannot change back
5. C. frying an egg
6. C. No, cooking made a change that cannot be undone.
7. A. can change back
8. D. chocolate melting in a warm hand
9. B. It turns solid again, in the mould's shape.
10. B. cannot change back
11. B. popping popcorn
12. D. It turns solid again, in the mould's shape.
13. B. cannot change back
14. A. an ice lolly (popsicle) melting
15. A. It turns solid again, in the mould's shape.
16. A. can change back