Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 383 · 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.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas
2. 2.True or false: sunlight is something yeast does not need. (a) False (b) True
3. 3.True or false: sunlight is something yeast needs. (a) True (b) False
4. 4.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) salt
5. 5.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
6. 6.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the amount of water (c) size of the balloon (d) the amount of sugar
7. 7.⚖️ 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
8. 8.⚖️ 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 water (b) the water temperature (c) size of the balloon (d) the amount of yeast
9. 9.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) a balloon (c) warm water (d) dry yeast
11. 11.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold slows yeast down (d) cold water is heavy
12. 12.True or false: a comb is needed for the yeast balloon. (a) True (b) False
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a magnet (d) sugar
14. 14.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) a small bottle (d) a mirror
16. 16.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) the balloon is smaller (d) it turns to bread
17. 17.⚖️ 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 sugar
18. 18.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a comb (c) sugar (d) warm water
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a balloon (d) a mirror
20. 20.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
21. 21.🍞 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
22. 22.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
23. 23.⚖️ 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 measure it (b) we keep it the same (c) we change it
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) a small bottle (d) a battery cell
25. 25.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) warm water (c) a comb (d) a battery cell
26. 26.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) sunlight (d) sugar
27. 27.⚖️ 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
28. 28.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
29. 29.⚖️ 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
30. 30.⚖️ 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
31. 31.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) turmeric powder (d) sugar
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.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sunlight (d) sugar
34. 34.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
35. 35.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
36. 36.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
37. 37.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a battery cell (c) turmeric powder (d) a balloon
38. 38.🍞 Which of these is something yeast needs? (a) time (b) salt (c) vinegar (d) a magnet
39. 39.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
40. 40.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) warm water (d) a magnet

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