Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 146 · 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: sunlight is something yeast does not need. (a) False (b) True
2. 2.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
3. 3.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
4. 4.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) the balloon is bigger (d) it turns to bread
5. 5.⚖️ 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) False (b) True
6. 6.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
7. 7.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.⚖️ 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
9. 9.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) turmeric powder (c) a magnet (d) a mirror
10. 10.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) a magnet (d) warm water
12. 12.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) carbon dioxide gas (d) air from outside
13. 13.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) salt (d) time
15. 15.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) sugar (d) time
16. 16.🍞 Which of these is something yeast does not need? (a) a magnet (b) sugar (c) time (d) warm water
17. 17.⚖️ 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
18. 18.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) a magnet (d) sunlight
19. 19.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
20. 20.True or false: a magnet is 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 what we measure? (a) the amount of water (b) the amount of yeast (c) the amount of sugar (d) size of the balloon
22. 22.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
23. 23.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
24. 24.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
25. 25.⚖️ 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) True (b) False
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) sugar (c) a balloon (d) a small bottle
27. 27.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
28. 28.⚖️ 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) the amount of water (c) the amount of sugar (d) the same bottles
29. 29.True or false: sugar is needed for the yeast balloon. (a) False (b) True
30. 30.⚖️ 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) True (b) False
31. 31.🍞 Which of these is something yeast needs? (a) warm water (b) salt (c) sunlight (d) a magnet
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) sugar (d) a comb
33. 33.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
34. 34.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “size of the balloon”? (a) we change it (b) we measure it (c) we keep it the same
36. 36.True or false: a comb is needed for the yeast balloon. (a) True (b) False
37. 37.True or false: time is something yeast does not need. (a) False (b) True
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a small bottle (d) a battery cell
39. 39.⚖️ 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 change it (b) we measure it (c) we keep it the same
40. 40.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold slows yeast down (c) cold kills sugar (d) cold makes it pink

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