Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 423 · 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: a magnet is something yeast needs. (a) True (b) False
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
3. 3.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
4. 4.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) the yeast is killed (d) it glows
5. 5.⚖️ 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 keep it the same (b) we measure it (c) we change it
6. 6.True or false: sugar is something yeast needs. (a) False (b) True
7. 7.⚖️ 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 water temperature (c) the amount of sugar
8. 8.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) warm water (d) a paper clip
9. 9.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) the balloon is smaller (d) it turns to bread
10. 10.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) sugar (d) salt
11. 11.True or false: sugar is needed for the yeast balloon. (a) True (b) False
12. 12.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.⚖️ 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
15. 15.🍞 Which of these is something yeast does not need? (a) vinegar (b) sugar (c) warm water (d) time
16. 16.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
17. 17.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold makes it pink (d) cold slows yeast down
18. 18.⚖️ 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 same bottles (d) the amount of yeast
19. 19.⚖️ 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 change it (b) we measure it (c) we keep it the same
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a magnet (d) sugar
21. 21.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
22. 22.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) vinegar (d) time
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) a small bottle (d) a comb
24. 24.True or false: a small bottle is 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? Which of these is the one thing we change? (a) the water temperature (b) the amount of yeast (c) the same bottles (d) the amount of sugar
26. 26.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) put it in your mouth (d) throw it at a wall
27. 27.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
28. 28.⚖️ 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 yeast
29. 29.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
30. 30.True or false: vinegar is something yeast does not need. (a) True (b) False
31. 31.⚖️ 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 same bottles
32. 32.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) ice cold (d) boiling hot
33. 33.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) carbon dioxide gas (d) smoke
34. 34.⚖️ 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 change it (b) we measure it (c) we keep it the same
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a small bottle (d) a mirror
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a battery cell (d) dry yeast
37. 37.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
38. 38.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) sunlight (d) warm water
39. 39.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of sugar (d) a kind of salt
40. 40.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) sunlight

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