Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 680 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a paper clip (c) warm water (d) a small bottle
2. 2.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) keep it for a month (d) pour it down the sink
3. 3.True or false: sugar is needed for the yeast balloon. (a) True (b) False
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) a battery cell (d) a small bottle
5. 5.🔮 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
6. 6.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
7. 7.⚖️ 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
8. 8.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
9. 9.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) a magnet
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) warm water (c) a paper clip (d) a mirror
11. 11.🍞 Which of these is something yeast needs? (a) time (b) vinegar (c) a magnet (d) sunlight
12. 12.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) a magnet (d) sugar
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) size of the balloon (b) the amount of water (c) the water temperature
14. 14.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) steam (d) air from outside
15. 15.⚖️ 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) size of the balloon (c) the water temperature (d) the same bottles
16. 16.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) salt (d) warm water
17. 17.⚖️ 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
18. 18.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
19. 19.True or false: salt is something yeast does not need. (a) True (b) False
20. 20.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
21. 21.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
22. 22.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
23. 23.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
25. 25.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) sunlight
27. 27.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) the yeast is killed (d) it grows faster
28. 28.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
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 water”? (a) we measure it (b) we keep it the same (c) we change it
30. 30.⚖️ 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 sugar (b) the amount of yeast (c) size of the balloon (d) the water temperature
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) warm water (c) a small bottle (d) sugar
32. 32.True or false: a magnet is something yeast needs. (a) False (b) True
33. 33.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a small bottle (d) a paper clip
35. 35.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold slows yeast down (d) cold makes it pink
36. 36.⚖️ 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) False (b) True
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a mirror (d) sugar
38. 38.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
39. 39.🔍 Which is the odd one out? (a) salt (b) vinegar (c) a magnet (d) time
40. 40.⚖️ 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

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