Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 275 · 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 sugar to make gas? (a) yeast needs it (b) yeast does not need it
2. 2.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
3. 3.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a paper clip (c) a balloon (d) sugar
5. 5.⚖️ 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) False (b) True
6. 6.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
7. 7.🍞 Which of these is something yeast does not need? (a) sugar (b) salt (c) time (d) warm water
8. 8.⚖️ 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 measure it (b) we keep it the same (c) we change it
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) warm water (c) dry yeast (d) sugar
10. 10.🔍 Which is the odd one out? (a) time (b) sugar (c) salt (d) warm water
11. 11.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
12. 12.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) sunlight (d) time
13. 13.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to wash dishes (d) to clean floors
14. 14.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
15. 15.🔮 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
16. 16.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
17. 17.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
18. 18.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
19. 19.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) keep it for a month (d) throw it at a wall
20. 20.⚖️ 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) False (b) True
21. 21.🔍 Which is the odd one out? (a) salt (b) a magnet (c) vinegar (d) warm water
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
23. 23.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) the yeast is killed (d) it glows
24. 24.True or false: salt is something yeast needs. (a) False (b) True
25. 25.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) vinegar
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
28. 28.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
29. 29.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
30. 30.⚖️ 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 keep it the same (b) we change it (c) we measure it
31. 31.⚖️ 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
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) warm water (d) turmeric powder
33. 33.⚖️ 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
34. 34.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
35. 35.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) a balloon (d) a battery cell
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) a mirror (d) warm water
37. 37.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.⚖️ 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 amount of yeast (d) the water temperature
39. 39.True or false: warm water is something yeast does not need. (a) False (b) True
40. 40.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) sunlight

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