Yeast Balloon Experiment Worksheet

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

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