Yeast Balloon Experiment Worksheet

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

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