Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 49 · 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) True (b) False
2. 2.⚖️ 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
3. 3.⚖️ 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) size of the balloon
4. 4.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) sunlight
5. 5.True or false: sugar is needed for the yeast balloon. (a) False (b) True
6. 6.True or false: a magnet is something yeast does not need. (a) False (b) True
7. 7.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) sugar (d) warm water
8. 8.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
9. 9.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
10. 10.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold slows yeast down (d) cold kills sugar
11. 11.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.⚖️ 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 measure it (b) we keep it the same (c) we change it
13. 13.🍞 Which of these is something yeast needs? (a) sunlight (b) sugar (c) salt (d) a magnet
14. 14.🔍 Which is the odd one out? (a) vinegar (b) salt (c) sunlight (d) time
15. 15.🧺 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
16. 16.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
17. 17.🍞 Which of these is something yeast needs? (a) a magnet (b) time (c) vinegar (d) sunlight
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) turmeric powder (d) a small bottle
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) a balloon (d) turmeric powder
20. 20.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it bursts at once (d) it grows much faster
21. 21.🔍 Which is the odd one out? (a) salt (b) time (c) warm water (d) sugar
22. 22.⚖️ 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 sugar (b) the same bottles (c) the water temperature (d) size of the balloon
23. 23.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
24. 24.True or false: warm water is something yeast does not need. (a) True (b) False
25. 25.⚖️ 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) True (b) False
26. 26.True or false: sugar is something yeast does not need. (a) True (b) False
27. 27.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
28. 28.⚖️ 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
29. 29.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
30. 30.🍞 Which of these is something yeast needs? (a) vinegar (b) warm water (c) sunlight (d) salt
31. 31.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
32. 32.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it grows faster (d) it turns to sugar
33. 33.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a balloon (d) a magnet
35. 35.True or false: warm water is needed for the yeast balloon. (a) True (b) False
36. 36.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
37. 37.⚖️ 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 keep it the same (b) we change it (c) we measure it
38. 38.⚖️ 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
39. 39.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
40. 40.True or false: vinegar is something yeast does not need. (a) False (b) True

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