Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 913 · 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 does not need? (a) time (b) warm water (c) a magnet (d) sugar
2. 2.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
3. 3.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) time (d) salt
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of sugar (b) size of the balloon (c) the water temperature (d) the amount of yeast
5. 5.True or false: a magnet is something yeast needs. (a) True (b) False
6. 6.True or false: salt is something yeast needs. (a) True (b) False
7. 7.⚖️ 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
8. 8.⚖️ 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 keep it the same (c) we change it
9. 9.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) sugar (d) time
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) warm water (c) sugar (d) a small bottle
11. 11.True or false: warm water is something yeast needs. (a) False (b) True
12. 12.🍞 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
13. 13.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
14. 14.⚖️ 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 measure it (b) we keep it the same (c) we change it
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) warm water (d) a battery cell
16. 16.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) air from outside (d) steam
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) True (b) False
18. 18.🍞 Which of these is something yeast does not need? (a) warm water (b) sunlight (c) sugar (d) time
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) turmeric powder (c) sugar (d) a small bottle
20. 20.⚖️ 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 yeast (b) the amount of water (c) size of the balloon (d) the water temperature
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a comb (c) turmeric powder (d) a small bottle
22. 22.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) ice cold (d) very salty
23. 23.⚖️ 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) True (b) False
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a balloon (c) sugar (d) a paper clip
25. 25.⚖️ 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) True (b) False
26. 26.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
27. 27.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) sugar (d) a paper clip
29. 29.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
30. 30.🔮 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
31. 31.True or false: a magnet is something yeast does not need. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) sunlight
33. 33.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
34. 34.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) the balloon is smaller (d) it turns to bread
35. 35.True or false: vinegar is something yeast needs. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) salt (b) a magnet (c) vinegar (d) warm water
37. 37.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
38. 38.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
39. 39.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
40. 40.⚖️ 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 measure it (c) we keep it the same

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