Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 536 · 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.⚖️ 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
2. 2.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) it shrinks to nothing (d) the balloon is bigger
4. 4.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it grows very little (d) it bursts at once
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) a balloon (d) a magnet
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a magnet (d) dry yeast
7. 7.🔍 Which is the odd one out? (a) vinegar (b) salt (c) sugar (d) sunlight
8. 8.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) turmeric powder (d) 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 water”? (a) we measure it (b) we change it (c) we keep it the same
10. 10.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
11. 11.⚖️ 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) False (b) True
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) warm water (d) a paper clip
13. 13.True or false: time is something yeast does not need. (a) False (b) True
14. 14.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) sunlight (d) sugar
15. 15.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
16. 16.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
17. 17.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) air from outside (d) smoke
18. 18.True or false: a magnet is something yeast needs. (a) True (b) False
19. 19.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
20. 20.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) to colour it (d) it is food for yeast
22. 22.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
23. 23.⚖️ 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 yeast (b) the amount of water (c) size of the balloon (d) the water temperature
24. 24.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
25. 25.⚖️ 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) True (b) False
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) a small bottle (c) a balloon (d) sugar
27. 27.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a battery cell (c) a paper clip (d) a balloon
29. 29.⚖️ 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 keep it the same (c) we measure it
30. 30.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) salt
31. 31.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) vinegar (d) time
32. 32.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
33. 33.⚖️ 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
34. 34.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
36. 36.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
38. 38.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
39. 39.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
40. 40.⚖️ 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) True (b) False

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