Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 458 · 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: sugar is needed for the yeast balloon. (a) False (b) True
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) turmeric powder (d) a balloon
3. 3.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it grows much faster (d) it turns yellow
4. 4.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
5. 5.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) warm water (d) time
6. 6.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
7. 7.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
8. 8.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a battery cell (d) a small bottle
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) dry yeast (d) a small bottle
11. 11.True or false: sugar is something yeast needs. (a) False (b) True
12. 12.⚖️ 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
13. 13.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) it turns to bread (d) the balloon is bigger
14. 14.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False
16. 16.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) the yeast is killed (c) it glows (d) it grows faster
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True
18. 18.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) a small bottle (c) warm water (d) sugar
19. 19.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) salt
20. 20.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
22. 22.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) vinegar (d) sunlight
23. 23.⚖️ 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
24. 24.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
25. 25.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
26. 26.True or false: salt is something yeast does not need. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) sugar (b) time (c) a magnet (d) warm water
28. 28.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
29. 29.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
30. 30.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold slows yeast down (c) cold kills sugar (d) cold water is heavy
31. 31.True or false: a comb is needed for the yeast balloon. (a) True (b) False
32. 32.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
33. 33.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) dry yeast (c) a mirror (d) a comb
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) dry yeast (c) a balloon (d) a small bottle
35. 35.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) air from outside (d) steam
36. 36.True or false: a magnet is something yeast does not need. (a) False (b) True
37. 37.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
38. 38.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
39. 39.⚖️ 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 water temperature (b) size of the balloon (c) the amount of yeast (d) the same bottles
40. 40.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a balloon (d) a battery cell

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