Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 833 · 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.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold kills sugar (c) cold makes it pink (d) cold water is heavy
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) warm water (d) a magnet
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of yeast (c) the amount of water (d) the amount of sugar
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a mirror (c) dry yeast (d) a balloon
5. 5.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.True or false: time is something yeast does not need. (a) True (b) False
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) False (b) True
8. 8.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to clean floors (c) to make bread rise (d) to colour rice
9. 9.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
10. 10.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
11. 11.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
12. 12.True or false: sunlight is something yeast needs. (a) False (b) True
13. 13.⚖️ 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
14. 14.⚖️ 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 change it (c) we measure it
15. 15.🔍 Which is the odd one out? (a) time (b) sugar (c) a magnet (d) warm water
16. 16.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) sunlight
17. 17.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) sugar (d) time
18. 18.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) salt (d) sugar
19. 19.True or false: warm water is needed for the yeast balloon. (a) False (b) True
20. 20.True or false: vinegar is something yeast needs. (a) True (b) False
21. 21.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
22. 22.🔮 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
23. 23.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) boiling hot (d) very salty
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) the water temperature (c) size of the balloon
25. 25.🍞 Which of these is something yeast does not need? (a) sugar (b) vinegar (c) warm water (d) time
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the amount of sugar (c) the water temperature
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a comb (c) a balloon (d) sugar
28. 28.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
30. 30.⚖️ 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) False (b) True
31. 31.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it turns yellow (d) it grows very little
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) True (b) False
33. 33.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
34. 34.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
35. 35.🍞 Which of these is something yeast needs? (a) vinegar (b) warm water (c) sunlight (d) salt
36. 36.⚖️ 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
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) dry yeast (d) warm water
38. 38.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
39. 39.⚖️ 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 measure it (b) we change it (c) we keep it the same
40. 40.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True

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