Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 501 · 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.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) steam (d) carbon dioxide gas
2. 2.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
3. 3.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.🍞 Which of these is something yeast does not need? (a) sunlight (b) warm water (c) time (d) sugar
5. 5.🍞 Which of these is something yeast needs? (a) time (b) a magnet (c) vinegar (d) sunlight
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a small bottle (d) a paper clip
7. 7.🍞 Which of these is something yeast does not need? (a) vinegar (b) sugar (c) warm water (d) time
8. 8.⚖️ 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 measure it (c) we change it
9. 9.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) sunlight
11. 11.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to colour rice (d) to wash dishes
12. 12.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold water is heavy (d) cold makes it pink
13. 13.⚖️ 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
14. 14.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
15. 15.🔮 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
16. 16.True or false: vinegar is something yeast does not need. (a) True (b) False
17. 17.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
18. 18.⚖️ 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 keep it the same (c) we measure it
19. 19.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a kind of sugar (d) a tiny living fungus
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) warm water (d) a comb
21. 21.⚖️ 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 change it (c) we measure it
22. 22.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
23. 23.🔮 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
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a small bottle (d) turmeric powder
25. 25.True or false: sunlight is something yeast does not need. (a) False (b) True
26. 26.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.🔍 Which is the odd one out? (a) a magnet (b) sugar (c) time (d) warm water
28. 28.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) a small bottle (c) a balloon (d) sugar
29. 29.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) salt
30. 30.True or false: time is something yeast needs. (a) False (b) True
31. 31.True or false: time is something yeast does not need. (a) True (b) False
32. 32.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
33. 33.⚖️ 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
34. 34.⚖️ 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
35. 35.⚖️ 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 water (b) the amount of sugar (c) the amount of yeast (d) size of the balloon
36. 36.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a magnet (c) a balloon (d) a small bottle
38. 38.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to colour it (d) to make it sweet
39. 39.🔍 Which is the odd one out? (a) time (b) sugar (c) salt (d) warm water
40. 40.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True

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