Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 333 · 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) dry yeast (b) a mirror (c) a small bottle (d) a balloon
2. 2.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.🛟 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
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a mirror (c) warm water (d) sugar
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a magnet (d) a small bottle
6. 6.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) warm water (c) dry yeast (d) a small bottle
7. 7.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) sunlight (d) sugar
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) dry yeast (c) a balloon (d) sugar
9. 9.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
10. 10.⚖️ 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 measure it (c) we keep it the same
11. 11.True or false: sunlight is something yeast needs. (a) True (b) False
12. 12.True or false: vinegar is something yeast needs. (a) True (b) False
13. 13.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
14. 14.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) sunlight
15. 15.⚖️ 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 keep it the same (c) we change it
16. 16.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) salt (d) vinegar
17. 17.⚖️ 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
18. 18.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold slows yeast down (d) cold makes it pink
19. 19.True or false: warm water is something yeast does not need. (a) False (b) True
20. 20.True or false: time is something yeast needs. (a) True (b) False
21. 21.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) salt (d) time
22. 22.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
23. 23.⚖️ 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) False (b) True
24. 24.True or false: warm water is something yeast needs. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) salt (b) vinegar (c) a magnet (d) time
26. 26.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) warm water (d) time
27. 27.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of stone (d) a kind of salt
28. 28.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) salt (d) sugar
29. 29.True or false: a comb is needed for the yeast balloon. (a) False (b) True
30. 30.True or false: a magnet is something yeast does not need. (a) True (b) False
31. 31.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
32. 32.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) a small bottle (d) turmeric powder
34. 34.True or false: sugar is something yeast does not need. (a) False (b) True
35. 35.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) sunlight (d) vinegar
36. 36.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
37. 37.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
38. 38.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
39. 39.⚖️ 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
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) True (b) False

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