Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 151 · 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.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
2. 2.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) it turns to bread (d) the balloon is smaller
3. 3.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) warm water (d) vinegar
4. 4.⚖️ 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) size of the balloon (c) the amount of sugar
5. 5.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) it grows faster (d) the yeast is killed
6. 6.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) pour it down the sink (d) put it in your mouth
7. 7.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
8. 8.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
9. 9.⚖️ 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 sugar (b) the same bottles (c) the water temperature (d) the amount of yeast
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
11. 11.True or false: vinegar is something yeast does not need. (a) False (b) True
12. 12.True or false: sugar is something yeast does not need. (a) False (b) True
13. 13.True or false: a magnet is something yeast needs. (a) False (b) True
14. 14.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) a battery cell (d) sugar
16. 16.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
17. 17.⚖️ 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 yeast (b) the same bottles (c) size of the balloon (d) the amount of water
18. 18.⚖️ 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
19. 19.⚖️ 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
20. 20.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) vinegar (d) sugar
21. 21.🔍 Which is the odd one out? (a) salt (b) time (c) a magnet (d) sunlight
22. 22.True or false: warm water is needed for the yeast balloon. (a) False (b) True
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) sugar (d) turmeric powder
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) a magnet (d) a balloon
25. 25.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) vinegar (d) a magnet
26. 26.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
27. 27.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.⚖️ 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 amount of yeast (c) size of the balloon
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a mirror (c) dry yeast (d) a balloon
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) warm water (d) a comb
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we change it (b) we measure it (c) we keep it the same
32. 32.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
33. 33.True or false: warm water is something yeast does not need. (a) True (b) False
34. 34.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🧺 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
36. 36.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) sunlight
37. 37.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) carbon dioxide gas (d) air from outside
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) sugar (d) a comb
40. 40.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False

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