Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 729 · 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) carbon dioxide gas (c) steam (d) air from outside
2. 2.⚖️ 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) size of the balloon (c) the amount of sugar (d) the amount of yeast
3. 3.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
4. 4.⚖️ 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 keep it the same (b) we measure it (c) we change it
5. 5.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
6. 6.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
7. 7.⚖️ 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
8. 8.⚖️ 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 measure it (b) we change it (c) we keep it the same
9. 9.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) True (b) False
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a balloon (d) turmeric powder
13. 13.True or false: time is something yeast needs. (a) False (b) True
14. 14.True or false: warm water is something yeast needs. (a) False (b) True
15. 15.⚖️ 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 water temperature (c) size of the balloon (d) the same bottles
16. 16.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) salt
17. 17.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
18. 18.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) the balloon is smaller (d) it shrinks to nothing
19. 19.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
20. 20.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.⚖️ 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
22. 22.🔍 Which is the odd one out? (a) salt (b) a magnet (c) sunlight (d) warm water
23. 23.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a comb (c) warm water (d) turmeric powder
24. 24.🍞 Which of these is something yeast does not need? (a) sunlight (b) warm water (c) time (d) sugar
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) sugar (d) a balloon
26. 26.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to colour rice (d) to make bread rise
27. 27.True or false: sunlight is something yeast needs. (a) False (b) True
28. 28.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
29. 29.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
30. 30.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
31. 31.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
32. 32.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
33. 33.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
34. 34.True or false: a comb is needed for the yeast balloon. (a) True (b) False
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a battery cell (d) warm water
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) dry yeast (d) a battery cell
37. 37.🍞 Which of these is something yeast does not need? (a) a magnet (b) warm water (c) sugar (d) time
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) turmeric powder (c) a small bottle (d) a comb
39. 39.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
40. 40.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) warm water (d) sunlight

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