Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 43 · 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.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) very salty (d) boiling hot
2. 2.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a mirror (c) a balloon (d) sugar
4. 4.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
5. 5.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
6. 6.⚖️ 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 water temperature (d) the amount of sugar
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) dry yeast (c) warm water (d) a balloon
8. 8.True or false: a magnet is something yeast needs. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) salt (d) time
10. 10.⚖️ 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) True (b) False
11. 11.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) put it in your mouth (d) throw it at a wall
13. 13.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
14. 14.⚖️ 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
15. 15.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) turmeric powder (d) a balloon
17. 17.🔮 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
18. 18.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
19. 19.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) turmeric powder (c) dry yeast (d) a paper clip
20. 20.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
21. 21.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) a magnet (d) sugar
22. 22.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it bursts at once (d) it turns yellow
23. 23.🔍 Which is the odd one out? (a) time (b) vinegar (c) sugar (d) warm water
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) sugar (c) a balloon (d) a small bottle
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) dry yeast (c) warm water (d) sugar
26. 26.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.⚖️ 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 keep it the same (b) we change it (c) we measure it
29. 29.⚖️ 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 sugar (c) the same bottles (d) the water temperature
30. 30.🔍 Which is the odd one out? (a) sugar (b) time (c) sunlight (d) warm water
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) a balloon (d) a magnet
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 measure it (b) we change it (c) we keep it the same
33. 33.True or false: a magnet is something yeast does not need. (a) False (b) True
34. 34.🍞 Which of these is something yeast needs? (a) time (b) a magnet (c) salt (d) vinegar
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False
36. 36.True or false: sugar is something yeast needs. (a) True (b) False
37. 37.True or false: a comb is needed for the yeast balloon. (a) False (b) True
38. 38.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) air from outside (d) carbon dioxide gas
39. 39.True or false: salt is something yeast needs. (a) True (b) False
40. 40.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed

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