Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 976 · 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.🛟 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
2. 2.🍞 Which of these is something yeast does not need? (a) sugar (b) a magnet (c) warm water (d) time
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) False (b) True
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) sugar (d) a mirror
5. 5.⚖️ 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
6. 6.🍞 Does yeast need sugar 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? True or false: the amount of sugar is what we measure. (a) True (b) False
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a comb (c) dry yeast (d) a balloon
9. 9.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.🔍 Which is the odd one out? (a) salt (b) vinegar (c) warm water (d) a magnet
11. 11.⚖️ 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 water (b) the amount of sugar (c) the water temperature (d) size of the balloon
12. 12.True or false: salt is something yeast does not need. (a) True (b) False
13. 13.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
14. 14.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
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 water”? (a) we change it (b) we keep it the same (c) we measure it
16. 16.True or false: sunlight is something yeast does not need. (a) False (b) True
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) warm water (c) sugar (d) a balloon
18. 18.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) it shrinks to nothing (d) the balloon is bigger
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) dry yeast (d) sugar
20. 20.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) sugar (d) salt
21. 21.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
22. 22.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
23. 23.⚖️ 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 change it (c) we measure it
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) warm water (d) a paper clip
25. 25.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold makes it pink (d) cold slows yeast down
26. 26.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
27. 27.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) sunlight (d) time
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) dry yeast (d) a battery cell
29. 29.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
30. 30.🍞 Which of these is something yeast needs? (a) warm water (b) salt (c) a magnet (d) sunlight
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) turmeric powder (d) sugar
32. 32.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
33. 33.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) warm water (c) a mirror (d) a comb
34. 34.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) salt (d) warm water
36. 36.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
37. 37.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) smoke (d) air from outside
38. 38.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
39. 39.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
40. 40.🍞 Which of these is something yeast does not need? (a) warm water (b) vinegar (c) sugar (d) time

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