Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 105 · 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.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
2. 2.🍞 Why do we add sugar to the yeast? (a) to colour it (b) it is food for yeast (c) to make it heavy (d) to make it sweet
3. 3.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) warm water (d) salt
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a battery cell (d) a small bottle
5. 5.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) turmeric powder (c) a mirror (d) a small bottle
7. 7.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) salt
8. 8.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) turmeric powder (c) a mirror (d) a battery cell
9. 9.True or false: vinegar is something yeast needs. (a) True (b) False
10. 10.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
11. 11.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
12. 12.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
13. 13.⚖️ 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 keep it the same (c) we measure it
14. 14.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
15. 15.🍞 Which of these is something yeast needs? (a) vinegar (b) sugar (c) salt (d) a magnet
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a small bottle (d) turmeric powder
17. 17.🔍 Which is the odd one out? (a) time (b) vinegar (c) a magnet (d) salt
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) size of the balloon (c) the amount of sugar (d) the amount of water
19. 19.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
20. 20.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
21. 21.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) a magnet
22. 22.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) a mirror (d) warm water
24. 24.True or false: a magnet is something yeast does not need. (a) True (b) False
25. 25.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
26. 26.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it turns to sugar (d) it glows
27. 27.True or false: sugar is something yeast does not need. (a) True (b) False
28. 28.⚖️ 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) True (b) False
29. 29.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
30. 30.⚖️ 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 change it (b) we measure it (c) we keep it the same
31. 31.🔍 Which is the odd one out? (a) warm water (b) time (c) sunlight (d) sugar
32. 32.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
33. 33.⚖️ 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 change it (b) we measure it (c) we keep it the same
34. 34.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) sugar (d) time
35. 35.⚖️ 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 same bottles (d) the amount of yeast
36. 36.🍞 Which of these is something yeast needs? (a) time (b) vinegar (c) sunlight (d) a magnet
37. 37.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
38. 38.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) smoke (d) steam
39. 39.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) vinegar (d) warm water
40. 40.⚖️ 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

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