Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 720 · 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.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
2. 2.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) dry yeast (c) warm water (d) a small bottle
4. 4.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold slows yeast down (c) cold water is heavy (d) cold kills sugar
5. 5.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
6. 6.🍞 Which of these is something yeast does not need? (a) sugar (b) salt (c) warm water (d) time
7. 7.⚖️ 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
8. 8.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) sugar (d) salt
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a magnet (c) sugar (d) dry yeast
10. 10.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
11. 11.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
12. 12.⚖️ 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) False (b) True
13. 13.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) sugar (d) a paper clip
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) a balloon (d) a mirror
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a small bottle (d) a battery cell
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) a small bottle (c) sugar (d) dry yeast
18. 18.⚖️ 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
19. 19.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
20. 20.🔮 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
21. 21.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
22. 22.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
23. 23.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
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 measure it (b) we change it (c) we keep it the same
25. 25.⚖️ 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
26. 26.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a kind of stone (d) a tiny living fungus
27. 27.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
28. 28.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
29. 29.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
30. 30.⚖️ 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
31. 31.⚖️ 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 same bottles (d) the amount of yeast
32. 32.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) sunlight
33. 33.⚖️ 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) size of the balloon (c) the amount of water
34. 34.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
35. 35.True or false: a magnet is something yeast needs. (a) False (b) True
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) False (b) True
37. 37.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
38. 38.🍞 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
39. 39.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) time (d) sunlight
40. 40.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed

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