Yeast Balloon Experiment Worksheet

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

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