Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 632 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a small bottle (d) a magnet
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) turmeric powder (c) a balloon (d) dry yeast
3. 3.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a comb (d) a small bottle
5. 5.⚖️ 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) False (b) True
6. 6.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
7. 7.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) vinegar
8. 8.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
9. 9.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
10. 10.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) sugar (d) salt
11. 11.🔮 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
12. 12.True or false: salt is something yeast needs. (a) True (b) False
13. 13.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
14. 14.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
16. 16.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
17. 17.⚖️ 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
18. 18.True or false: time is something yeast does not need. (a) True (b) False
19. 19.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) time (d) sugar
21. 21.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) boiling hot (d) very salty
22. 22.⚖️ 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) the same bottles (c) size of the balloon
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a balloon (d) a mirror
24. 24.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) turmeric powder (d) dry yeast
25. 25.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) sugar (c) a paper clip (d) a battery cell
26. 26.⚖️ 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
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) a small bottle (d) a balloon
28. 28.True or false: sunlight is something yeast needs. (a) False (b) True
29. 29.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
31. 31.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
32. 32.True or false: time is something yeast needs. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) salt (d) sunlight
34. 34.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) sugar (d) salt
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a comb (c) a small bottle (d) sugar
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a small bottle (c) a mirror (d) a magnet
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) True (b) False
38. 38.⚖️ 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) False (b) True
39. 39.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold slows yeast down (d) cold makes it pink
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) False (b) True

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