Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 915 · 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.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) salt (d) warm water
2. 2.🔮 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
3. 3.🔍 Which is the odd one out? (a) warm water (b) time (c) salt (d) sugar
4. 4.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) vinegar
5. 5.⚖️ 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 yeast (b) the same bottles (c) the water temperature (d) size of the balloon
6. 6.⚖️ 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
7. 7.⚖️ 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
8. 8.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) turmeric powder (c) warm water (d) a comb
10. 10.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
11. 11.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it turns yellow (d) it grows much faster
13. 13.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
14. 14.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) sugar (c) warm water (d) a small bottle
16. 16.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
18. 18.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) turmeric powder (c) a small bottle (d) sugar
19. 19.⚖️ 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
20. 20.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
21. 21.⚖️ 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 sugar
22. 22.🍞 Which of these is something yeast does not need? (a) sunlight (b) sugar (c) time (d) warm water
23. 23.⚖️ 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 measure it (b) we change it (c) we keep it the same
24. 24.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) time (d) vinegar
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a paper clip (d) a balloon
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a magnet (d) sugar
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) salt (d) sunlight
29. 29.True or false: salt is something yeast needs. (a) True (b) False
30. 30.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
31. 31.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
32. 32.True or false: vinegar is something yeast does not need. (a) True (b) False
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) warm water (d) a battery cell
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) dry yeast (d) a mirror
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
36. 36.True or false: warm water is something yeast needs. (a) False (b) True
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) a paper clip (d) sugar
38. 38.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) smoke (d) air from outside
39. 39.⚖️ 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 change it (c) we keep it the same
40. 40.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) warm water (d) time

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