Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 864 · 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.🔍 Which is the odd one out? (a) a magnet (b) salt (c) sunlight (d) time
2. 2.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
3. 3.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
4. 4.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
5. 5.⚖️ 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 keep it the same (b) we change it (c) we measure it
6. 6.True or false: sugar is something yeast does not need. (a) True (b) False
7. 7.True or false: time is something yeast needs. (a) False (b) True
8. 8.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
9. 9.⚖️ 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 water temperature (c) the same bottles
10. 10.⚖️ 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 measure it (c) we keep it the same
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) keep it for a month (d) pour it down the sink
12. 12.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold slows yeast down (d) cold kills sugar
13. 13.True or false: sugar is something yeast needs. (a) False (b) True
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) warm water (d) a comb
15. 15.⚖️ 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
16. 16.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
17. 17.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a small bottle (c) a battery cell (d) a paper clip
18. 18.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) sugar (c) dry yeast (d) warm water
20. 20.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
21. 21.⚖️ 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 yeast (c) the water temperature
22. 22.⚖️ 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 yeast (b) the amount of water (c) the amount of sugar (d) the water temperature
23. 23.🍞 Which of these is something yeast does not need? (a) vinegar (b) warm water (c) time (d) sugar
24. 24.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
25. 25.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it turns yellow (d) it bursts at once
26. 26.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a small bottle (c) a balloon (d) sugar
28. 28.🍞 Which of these is something yeast needs? (a) warm water (b) vinegar (c) salt (d) sunlight
29. 29.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a comb (c) a small bottle (d) warm water
31. 31.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to clean floors (d) to wash dishes
32. 32.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
33. 33.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) warm water (c) a comb (d) a magnet
34. 34.⚖️ 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
35. 35.True or false: warm water is something yeast needs. (a) True (b) False
36. 36.⚖️ 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) False (b) True
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) False (b) True
38. 38.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) boiling hot (d) very salty
39. 39.⚖️ 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
40. 40.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas

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