Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 737 · 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 is the odd one out? (a) vinegar (b) sunlight (c) sugar (d) salt
2. 2.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.⚖️ 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 water temperature (c) the amount of yeast (d) size of the balloon
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) warm water (d) dry yeast
5. 5.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
6. 6.⚖️ 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
7. 7.True or false: vinegar is something yeast needs. (a) False (b) True
8. 8.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
9. 9.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) a balloon (d) a magnet
11. 11.⚖️ 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) False (b) True
12. 12.⚖️ 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 keep it the same (b) we change it (c) we measure it
13. 13.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
14. 14.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a battery cell (c) dry yeast (d) a balloon
17. 17.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
18. 18.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) salt
19. 19.⚖️ 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) True (b) False
20. 20.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
21. 21.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a mirror (c) a comb (d) a magnet
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
23. 23.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) put it in your mouth (d) pour it down the sink
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a battery cell (c) a balloon (d) a small bottle
25. 25.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it turns yellow (d) it grows much faster
26. 26.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) warm water (d) sugar
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) size of the balloon (c) the water temperature
28. 28.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
29. 29.🍞 Which of these is something yeast needs? (a) sugar (b) sunlight (c) salt (d) a magnet
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) a comb (d) sugar
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a balloon (d) a mirror
32. 32.⚖️ 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) size of the balloon (b) the amount of water (c) the amount of sugar (d) the water temperature
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a magnet (d) a small bottle
34. 34.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) the yeast is killed (d) it glows
35. 35.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
36. 36.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
37. 37.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) time (d) warm water
38. 38.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) sugar (c) dry yeast (d) a balloon
40. 40.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True

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