Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 109 · 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.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) a magnet (d) sugar
2. 2.⚖️ 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
3. 3.🍞 Which of these is something yeast does not need? (a) vinegar (b) sugar (c) warm water (d) time
4. 4.⚖️ 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
5. 5.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it turns yellow (d) it bursts at once
6. 6.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) the balloon is bigger (d) it turns to bread
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) dry yeast (d) a battery cell
8. 8.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) salt
9. 9.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) air from outside (d) carbon dioxide gas
10. 10.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) sunlight
11. 11.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) salt (b) sunlight (c) vinegar (d) sugar
14. 14.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
15. 15.⚖️ 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
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) dry yeast (d) a balloon
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) a small bottle (d) warm water
18. 18.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) warm water (d) a battery cell
19. 19.⚖️ 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 water (d) the amount of sugar
20. 20.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
21. 21.True or false: sugar is needed for the yeast balloon. (a) True (b) False
22. 22.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a paper clip (c) a mirror (d) a small bottle
23. 23.⚖️ 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 measure it (b) we change it (c) we keep it the same
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) turmeric powder (d) a small bottle
25. 25.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
26. 26.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
27. 27.🔮 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
28. 28.True or false: a comb is needed for the yeast balloon. (a) False (b) True
29. 29.🍞 Which of these is something yeast does not need? (a) a magnet (b) warm water (c) sugar (d) time
30. 30.True or false: sugar is something yeast needs. (a) True (b) False
31. 31.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
33. 33.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
34. 34.⚖️ 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 change it (b) we measure it (c) we keep it the same
35. 35.🔍 Which is the odd one out? (a) time (b) warm water (c) vinegar (d) sugar
36. 36.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
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 kept the same. (a) True (b) False
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a balloon (c) sugar (d) a small bottle
39. 39.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) sunlight (d) time
40. 40.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed

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