Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 506 · 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 battery cell is not needed for the yeast balloon. (a) False (b) True
2. 2.⚖️ 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
3. 3.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold slows yeast down (d) cold water is heavy
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) warm water (d) a battery cell
5. 5.True or false: salt is something yeast needs. (a) True (b) False
6. 6.True or false: a magnet is something yeast needs. (a) True (b) False
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) a small bottle (c) warm water (d) sugar
8. 8.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
9. 9.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
11. 11.⚖️ 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
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a paper clip (d) sugar
13. 13.⚖️ 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
14. 14.⚖️ 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
15. 15.True or false: sugar is something yeast needs. (a) False (b) True
16. 16.⚖️ 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 sugar (c) the water temperature (d) the amount of water
17. 17.🔮 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
18. 18.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
19. 19.True or false: salt is something yeast does not need. (a) False (b) True
20. 20.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
21. 21.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) sugar (d) a comb
23. 23.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
24. 24.⚖️ 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
25. 25.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
26. 26.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) to make it heavy (d) it is food for yeast
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a mirror (d) a small bottle
28. 28.True or false: vinegar is something yeast needs. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) a magnet
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a battery cell (d) a balloon
31. 31.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
32. 32.True or false: warm water is needed for the yeast balloon. (a) True (b) False
33. 33.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
34. 34.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) vinegar
35. 35.⚖️ 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 yeast (b) size of the balloon (c) the amount of water (d) the water temperature
36. 36.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
37. 37.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
38. 38.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a battery cell (c) a paper clip (d) turmeric powder
39. 39.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
40. 40.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a comb (c) a mirror (d) a balloon

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