Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 512 · 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.True or false: a comb is needed for the yeast balloon. (a) False (b) True
2. 2.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) vinegar
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) False (b) True
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) warm water (c) sugar (d) dry yeast
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a magnet (c) sugar (d) a small bottle
6. 6.⚖️ 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 measure it (c) we change it
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) dry yeast (c) warm water (d) a balloon
8. 8.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
9. 9.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
11. 11.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
13. 13.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.True or false: a magnet is something yeast needs. (a) True (b) False
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) turmeric powder (c) a balloon (d) warm water
16. 16.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
17. 17.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) ice cold (d) boiling hot
18. 18.🍞 Which of these is something yeast needs? (a) warm water (b) vinegar (c) a magnet (d) sunlight
19. 19.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a small bottle (c) turmeric powder (d) a comb
21. 21.⚖️ 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 water (c) the water temperature (d) the amount of yeast
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (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 yeast”? (a) we keep it the same (b) we change it (c) we measure it
24. 24.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it grows much faster (d) it bursts at once
25. 25.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a paper clip (c) a mirror (d) dry yeast
26. 26.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
27. 27.⚖️ 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
28. 28.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) warm water (d) a mirror
29. 29.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) False (b) True
31. 31.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
32. 32.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
33. 33.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
34. 34.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
35. 35.True or false: vinegar is something yeast needs. (a) True (b) False
36. 36.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold slows yeast down (c) cold kills sugar (d) cold makes it pink
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of yeast (b) the water temperature (c) size of the balloon
38. 38.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) warm water (d) a battery cell
40. 40.⚖️ 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 water (b) size of the balloon (c) the amount of sugar (d) the water temperature

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