Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 410 · 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 needed for the yeast balloon? (a) a mirror (b) dry yeast (c) a comb (d) a magnet
2. 2.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it bursts at once (d) it turns yellow
3. 3.⚖️ 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 change it (b) we measure it (c) we keep it the same
4. 4.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
7. 7.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) the yeast is killed (d) it turns to sugar
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a magnet (d) a balloon
9. 9.True or false: salt is something yeast needs. (a) False (b) True
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) turmeric powder (c) dry yeast (d) a balloon
11. 11.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
12. 12.⚖️ 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 measure it (b) we change it (c) we keep it the same
13. 13.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
14. 14.⚖️ 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 amount of sugar (b) the water temperature (c) the same bottles (d) the amount of yeast
15. 15.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
16. 16.🔍 Which is the odd one out? (a) sugar (b) warm water (c) vinegar (d) time
17. 17.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
18. 18.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) throw it at a wall (d) pour it down the sink
19. 19.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
20. 20.True or false: warm water is something yeast does not need. (a) True (b) False
21. 21.True or false: time is something yeast needs. (a) False (b) True
22. 22.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
23. 23.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) sugar (c) a balloon (d) warm water
25. 25.True or false: a magnet is something yeast does not need. (a) False (b) True
26. 26.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) True (b) False
28. 28.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) warm water (d) a paper clip
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of sugar”? (a) we keep it the same (b) we change it (c) we measure it
31. 31.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) sunlight (d) warm water
32. 32.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a comb (d) a balloon
34. 34.🔮 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
35. 35.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) a small bottle (d) a magnet
36. 36.🔍 Which is the odd one out? (a) a magnet (b) salt (c) sunlight (d) sugar
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) turmeric powder (d) a balloon
38. 38.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
39. 39.⚖️ 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) False (b) True
40. 40.⚖️ 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 keep it the same (c) we measure it

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