Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 725 · 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 amount of sugar”? (a) we measure it (b) we keep it the same (c) we change it
2. 2.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
3. 3.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) a magnet
4. 4.🔍 Which is the odd one out? (a) warm water (b) time (c) sunlight (d) sugar
5. 5.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) sunlight (d) time
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) a balloon (c) warm water (d) sugar
7. 7.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
8. 8.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
9. 9.True or false: a comb is needed for the yeast balloon. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) sunlight (b) salt (c) vinegar (d) sugar
11. 11.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) salt
12. 12.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of sugar (b) the water temperature (c) size of the balloon (d) the amount of water
14. 14.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a mirror (c) dry yeast (d) a small bottle
16. 16.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) dry yeast (c) turmeric powder (d) a comb
17. 17.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold water is heavy (d) cold slows yeast down
18. 18.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) steam (d) smoke
19. 19.🛟 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
20. 20.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows much faster (d) it grows very little
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a balloon (d) turmeric powder
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a small bottle (d) a comb
23. 23.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
24. 24.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
25. 25.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
26. 26.⚖️ 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 keep it the same (b) we measure it (c) we change it
27. 27.🍞 Which of these is something yeast needs? (a) sugar (b) a magnet (c) vinegar (d) salt
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a paper clip (d) sugar
29. 29.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) vinegar
30. 30.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
31. 31.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a battery cell (c) a magnet (d) warm water
32. 32.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) dry yeast (c) sugar (d) a small bottle
34. 34.True or false: warm water is something yeast needs. (a) False (b) True
35. 35.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) it turns to bread (d) the balloon is smaller
36. 36.🍞 Why do we add sugar to the yeast? (a) to colour it (b) it is food for yeast (c) to make it sweet (d) to make it heavy
37. 37.⚖️ 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
38. 38.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) sugar (d) time
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 water”? (a) we keep it the same (b) we change it (c) we measure it

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