Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 85 · 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.🍞 Which of these is something yeast needs? (a) salt (b) warm water (c) a magnet (d) sunlight
2. 2.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
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 water temperature (c) the amount of yeast (d) the amount of sugar
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) a comb (d) warm water
5. 5.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
6. 6.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) turmeric powder (d) a small bottle
8. 8.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
9. 9.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
10. 10.🛟 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
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) a balloon (c) warm water (d) sugar
12. 12.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
13. 13.⚖️ 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 measure it (c) we keep it the same
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) size of the balloon (b) the water temperature (c) the same bottles (d) the amount of yeast
15. 15.⚖️ 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 measure it (b) we keep it the same (c) we change it
16. 16.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) the yeast is killed (d) it glows
17. 17.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) the balloon is bigger (d) it shrinks to nothing
18. 18.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
19. 19.True or false: a magnet is something yeast needs. (a) True (b) False
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a battery cell (c) dry yeast (d) sugar
21. 21.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
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.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) a battery cell (d) a small bottle
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a balloon (d) a magnet
25. 25.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) size of the balloon (c) the same bottles
27. 27.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a balloon (c) a small bottle (d) warm water
29. 29.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
30. 30.True or false: time is something yeast does not need. (a) True (b) False
31. 31.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold water is heavy (d) cold makes it pink
32. 32.True or false: a magnet is something yeast does not need. (a) False (b) True
33. 33.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) a magnet (d) time
35. 35.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) warm water (d) sugar
36. 36.⚖️ 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
37. 37.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
38. 38.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a balloon (c) sugar (d) warm water
40. 40.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) salt (d) time

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