Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 869 · 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 magnet is something yeast needs. (a) False (b) True
2. 2.True or false: warm water is something yeast does not need. (a) False (b) True
3. 3.True or false: sunlight is something yeast does not need. (a) True (b) False
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) the water temperature (b) the amount of yeast (c) size of the balloon
5. 5.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) keep it for a month (d) pour it down the sink
6. 6.⚖️ 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) True (b) False
7. 7.True or false: sugar is something yeast does not need. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) sunlight (d) a magnet
9. 9.True or false: salt is something yeast needs. (a) False (b) True
10. 10.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it turns to sugar (d) it glows
11. 11.🔮 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
12. 12.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) sunlight (d) salt
13. 13.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a small bottle (c) turmeric powder (d) a paper clip
15. 15.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) carbon dioxide gas (d) air from outside
16. 16.⚖️ 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 measure it (b) we keep it the same (c) we change it
17. 17.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
18. 18.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a mirror (c) turmeric powder (d) a battery cell
19. 19.⚖️ 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
20. 20.⚖️ 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
21. 21.True or false: sugar is needed for the yeast balloon. (a) True (b) False
22. 22.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
23. 23.⚖️ 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 amount of water (c) the water temperature
24. 24.⚖️ 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 change it (c) we measure it
25. 25.True or false: time is something yeast does not need. (a) False (b) True
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a magnet (d) warm water
27. 27.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) sunlight (d) time
28. 28.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) it turns to bread (d) the balloon is smaller
29. 29.⚖️ 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) False (b) True
30. 30.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
31. 31.⚖️ 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 keep it the same (c) we measure it
32. 32.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) salt (d) warm water
33. 33.🔍 Which is the odd one out? (a) salt (b) vinegar (c) sunlight (d) time
34. 34.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
36. 36.🍞 Which of these is something yeast needs? (a) vinegar (b) sugar (c) sunlight (d) salt
37. 37.⚖️ 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) the water temperature (c) size of the balloon
38. 38.⚖️ 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 water temperature (c) the amount of sugar (d) the same bottles
39. 39.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
40. 40.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) dry yeast (d) a battery cell

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