Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 625 · 40 questions

What you do (Yeast is alive): 1. Pour warm (not hot) water into the bottle — an adult checks it. 2. Add the yeast and the sugar and swirl gently. 3. Stretch the balloon over the bottle’s mouth. 4. Wait 30 minutes, measure the balloon, then pour the mixture away and wash up.

1. 1.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
2. 2.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is the one thing we change? (a) size of the balloon (b) the amount of yeast (c) the amount of water (d) the water temperature
4. 4.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
5. 5.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
6. 6.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the amount of sugar (c) the water temperature
7. 7.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of yeast”? (a) we change it (b) we keep it the same (c) we measure it
9. 9.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) a balloon (c) warm water (d) sugar
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) warm water (d) a magnet
13. 13.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) a battery cell (d) warm water
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) sugar (c) a balloon (d) dry yeast
15. 15.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
16. 16.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to clean floors (d) to make bread rise
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a balloon (c) dry yeast (d) warm water
18. 18.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) dry yeast (c) sugar (d) a small bottle
19. 19.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) turmeric powder (d) dry yeast
21. 21.True or false: time is something yeast does not need. (a) False (b) True
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of sugar”? (a) we keep it the same (b) we change it (c) we measure it
24. 24.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a small bottle (c) a comb (d) a magnet
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a battery cell (d) sugar
26. 26.True or false: salt is something yeast does not need. (a) True (b) False
27. 27.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) sunlight (d) warm water
28. 28.True or false: sunlight is something yeast does not need. (a) False (b) True
29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of yeast (c) the amount of water (d) the same bottles
30. 30.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
31. 31.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a balloon (c) a paper clip (d) a mirror
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) True (b) False
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a balloon (d) a comb
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we keep it the same (b) we change it (c) we measure it
35. 35.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a tiny living fungus (d) a kind of stone
36. 36.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
37. 37.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold slows yeast down (d) cold kills sugar
38. 38.🍞 Which of these is something yeast needs? (a) sugar (b) sunlight (c) salt (d) a magnet
39. 39.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
40. 40.True or false: warm water is something yeast does not need. (a) True (b) False

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