Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 90 · 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.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the water temperature”? (a) we measure it (b) we change it (c) we keep it the same
2. 2.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.🍞 Which of these is something yeast does not need? (a) time (b) vinegar (c) warm water (d) sugar
4. 4.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
5. 5.⚖️ 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) True (b) False
6. 6.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
7. 7.True or false: a magnet is something yeast needs. (a) True (b) False
8. 8.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) False (b) True
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) False (b) True
11. 11.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a paper clip (d) a balloon
15. 15.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) salt
16. 16.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) a magnet (d) salt
17. 17.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold kills sugar (d) cold slows yeast down
18. 18.⚖️ 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) the amount of sugar (b) the amount of yeast (c) size of the balloon (d) the water temperature
19. 19.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a tiny living fungus (d) a kind of salt
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) dry yeast (d) a battery cell
21. 21.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
22. 22.⚖️ 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 change it (b) we keep it the same (c) we measure it
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 water”? (a) we keep it the same (b) we change it (c) we measure it
24. 24.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
25. 25.True or false: a magnet is something yeast does not need. (a) False (b) True
26. 26.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) turmeric powder (d) a balloon
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False
28. 28.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
29. 29.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a balloon (d) turmeric powder
31. 31.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) sunlight
32. 32.🔍 Which is the odd one out? (a) sugar (b) salt (c) warm water (d) time
33. 33.True or false: time is something yeast needs. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) sugar (d) time
35. 35.True or false: a comb is needed for the yeast balloon. (a) True (b) False
36. 36.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
37. 37.⚖️ 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 water temperature (d) the same bottles
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a mirror (d) a balloon
39. 39.True or false: salt is something yeast does not need. (a) False (b) True
40. 40.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) keep it for a month (d) throw it at a wall

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