Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 321 · 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.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
2. 2.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a small bottle (c) a magnet (d) a comb
4. 4.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
5. 5.⚖️ 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 measure it (b) we keep it the same (c) we change it
6. 6.🍞 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
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) turmeric powder (c) a balloon (d) a battery cell
8. 8.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
9. 9.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) warm water (d) vinegar
10. 10.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster
11. 11.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a comb (c) warm water (d) a small bottle
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the water temperature (c) the amount of water (d) size of the balloon
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a balloon (c) warm water (d) dry yeast
16. 16.⚖️ 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 change it (b) we keep it the same (c) we measure it
17. 17.⚖️ 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
18. 18.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) time (d) sugar
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) a paper clip (d) sugar
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) False (b) True
21. 21.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a tiny living fungus (d) a kind of sugar
22. 22.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) size of the balloon (c) the water temperature
24. 24.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
25. 25.⚖️ 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
26. 26.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
27. 27.True or false: time is something yeast does not need. (a) False (b) True
28. 28.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) a magnet
29. 29.⚖️ 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 water temperature (b) the amount of sugar (c) size of the balloon (d) the amount of yeast
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
31. 31.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
32. 32.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it turns to sugar (d) it glows
33. 33.True or false: vinegar is something yeast does not need. (a) True (b) False
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 measure it (b) we change it (c) we keep it the same
35. 35.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
36. 36.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
37. 37.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) warm water (c) a battery cell (d) a magnet
38. 38.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) vinegar
39. 39.True or false: sunlight is something yeast does not need. (a) True (b) False
40. 40.True or false: time is something yeast needs. (a) False (b) True

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