Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 394 · 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.⚖️ 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
2. 2.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) warm water (d) a paper clip
4. 4.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold makes it pink (d) cold slows yeast down
6. 6.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) a magnet (d) dry yeast
8. 8.🔍 Which is the odd one out? (a) sugar (b) time (c) salt (d) warm water
9. 9.⚖️ 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
10. 10.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
11. 11.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.True or false: warm water is something yeast does not need. (a) True (b) False
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a comb (c) dry yeast (d) a small bottle
14. 14.⚖️ 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
15. 15.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) keep it for a month (d) put it in your mouth
16. 16.True or false: vinegar is something yeast needs. (a) True (b) False
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) dry yeast (c) a small bottle (d) sugar
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) True (b) False
19. 19.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster
20. 20.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it grows faster (d) it glows
21. 21.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) salt (d) warm water
22. 22.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) vinegar (d) time
23. 23.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
24. 24.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) dry yeast (c) sugar (d) warm water
26. 26.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) warm water (c) a mirror (d) a paper clip
29. 29.⚖️ 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 keep it the same (c) we change it
30. 30.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a mirror (c) a battery cell (d) a paper clip
31. 31.True or false: a magnet is something yeast needs. (a) False (b) True
32. 32.⚖️ 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 keep it the same (b) we change it (c) we measure it
33. 33.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
34. 34.⚖️ 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 amount of water (c) size of the balloon (d) the water temperature
35. 35.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) a magnet
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) a balloon (d) a battery cell
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 the one thing we change. (a) False (b) True
38. 38.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) warm water (d) sunlight
39. 39.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) time (d) sugar

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