Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 857 · 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.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
2. 2.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
3. 3.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it grows much faster (d) it turns yellow
5. 5.True or false: salt is something yeast needs. (a) False (b) True
6. 6.⚖️ 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 measure it (c) we keep it the same
7. 7.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) True (b) False
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 keep it the same (b) we change it (c) we measure it
10. 10.⚖️ 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 same bottles (d) size of the balloon
11. 11.🧺 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) warm water
12. 12.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) vinegar (d) salt
13. 13.⚖️ 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 measure it (c) we change it
14. 14.🔍 Which is the odd one out? (a) warm water (b) time (c) vinegar (d) sugar
15. 15.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) salt (b) a magnet (c) warm water (d) sunlight
17. 17.⚖️ 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 keep it the same (b) we change it (c) we measure it
18. 18.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
19. 19.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) the yeast is killed (d) it grows faster
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) a small bottle (c) dry yeast (d) sugar
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) a small bottle (d) a comb
22. 22.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) a battery cell (d) sugar
23. 23.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) salt (d) sunlight
24. 24.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) a magnet (d) sunlight
25. 25.True or false: sunlight is something yeast does not need. (a) False (b) True
26. 26.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
27. 27.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
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 the one thing we change. (a) True (b) False
29. 29.True or false: time is something yeast does not need. (a) False (b) True
30. 30.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) smoke (d) air from outside
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) dry yeast (d) sugar
32. 32.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
33. 33.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) it shrinks to nothing (d) the balloon is bigger
34. 34.True or false: sugar is something yeast needs. (a) False (b) True
35. 35.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
36. 36.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
37. 37.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
38. 38.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) sugar (d) time
39. 39.⚖️ 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) size of the balloon (c) the amount of water (d) the amount of sugar
40. 40.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed

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