Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 561 · 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 balloon is needed for the yeast balloon. (a) False (b) True
2. 2.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a comb (d) warm water
4. 4.⚖️ 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 water temperature (c) the amount of sugar
5. 5.⚖️ 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
6. 6.🔮 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
7. 7.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
8. 8.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it grows faster (d) it turns to sugar
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 change it (b) we measure it (c) we keep it the same
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the amount of yeast (c) size of the balloon (d) the water temperature
11. 11.🔍 Which is the odd one out? (a) time (b) sugar (c) salt (d) warm water
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) sugar (c) dry yeast (d) a small bottle
13. 13.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) warm water (d) vinegar
14. 14.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) sugar (c) a magnet (d) a mirror
15. 15.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold slows yeast down (d) cold water is heavy
16. 16.🔍 Which is the odd one out? (a) warm water (b) time (c) sunlight (d) sugar
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) turmeric powder (c) warm water (d) a balloon
18. 18.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
19. 19.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) time (d) warm water
20. 20.🍞 Which of these is something yeast needs? (a) vinegar (b) warm water (c) sunlight (d) a magnet
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a paper clip (d) a balloon
22. 22.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
23. 23.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) vinegar
24. 24.⚖️ 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
25. 25.🛟 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
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) turmeric powder (c) sugar (d) warm water
27. 27.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) the balloon is smaller (d) it shrinks to nothing
28. 28.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) a small bottle (c) dry yeast (d) a balloon
30. 30.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
31. 31.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
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.True or false: a magnet is something yeast needs. (a) False (b) True
34. 34.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
35. 35.🍞 Which of these is something yeast needs? (a) salt (b) sugar (c) sunlight (d) vinegar
36. 36.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a mirror (c) a small bottle (d) warm water
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) the water temperature (c) size of the balloon
40. 40.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold

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