Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 510 · 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: sugar is not needed for the yeast balloon. (a) True (b) False
2. 2.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) dry yeast (d) turmeric powder
3. 3.True or false: time is something yeast needs. (a) False (b) True
4. 4.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
6. 6.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) ice cold (d) warm, not hot
7. 7.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
8. 8.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold slows yeast down (c) cold water is heavy (d) cold kills sugar
9. 9.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) a magnet (d) time
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) sugar (d) a battery cell
11. 11.⚖️ 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
12. 12.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) it glows (d) the yeast is killed
13. 13.🔍 Which is the odd one out? (a) salt (b) warm water (c) vinegar (d) a magnet
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) turmeric powder (c) dry yeast (d) sugar
15. 15.🔍 Which is the odd one out? (a) salt (b) warm water (c) time (d) sugar
16. 16.⚖️ 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
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) sugar (d) a mirror
18. 18.True or false: a magnet is something yeast needs. (a) True (b) False
19. 19.⚖️ 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
20. 20.⚖️ 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 change it (b) we measure it (c) we keep it the same
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a small bottle (d) a magnet
22. 22.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) put it in your mouth (d) keep it for a month
23. 23.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
24. 24.⚖️ 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
25. 25.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it grows much faster (d) it bursts at once
26. 26.🔍 Which is the odd one out? (a) warm water (b) time (c) vinegar (d) sugar
27. 27.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) sunlight
28. 28.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) False (b) True
30. 30.⚖️ 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 keep it the same (b) we change it (c) we measure it
31. 31.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to wash dishes (d) to clean floors
32. 32.True or false: vinegar is something yeast does not need. (a) False (b) True
33. 33.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) turmeric powder (d) sugar
34. 34.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
35. 35.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) turmeric powder (c) a balloon (d) warm water
37. 37.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) sugar (d) salt
39. 39.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a paper clip (c) turmeric powder (d) a magnet
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 water temperature (b) the amount of yeast (c) the amount of water (d) the amount of sugar

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