Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 614 · 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) a small bottle (b) dry yeast (c) a balloon (d) a magnet
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a comb (d) warm water
3. 3.⚖️ 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
4. 4.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
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.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) the balloon is bigger (d) it shrinks to nothing
7. 7.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
8. 8.⚖️ 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 same bottles (c) size of the balloon
9. 9.🍞 Which of these is something yeast needs? (a) time (b) sunlight (c) salt (d) vinegar
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) sugar (d) a paper clip
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) False (b) True
12. 12.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) salt (d) sugar
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
14. 14.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
15. 15.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) time (d) sugar
16. 16.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) salt (d) warm water
17. 17.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
18. 18.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
19. 19.⚖️ 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
20. 20.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.True or false: time is something yeast needs. (a) True (b) False
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the same bottles (c) the amount of yeast (d) the water temperature
23. 23.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
24. 24.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
25. 25.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) turmeric powder (d) warm water
27. 27.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
28. 28.⚖️ 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
29. 29.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) time (b) vinegar (c) salt (d) sunlight
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) a mirror (d) warm water
32. 32.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) a mirror (d) dry yeast
34. 34.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
35. 35.🍞 Which of these is something yeast needs? (a) warm water (b) sunlight (c) vinegar (d) a magnet
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of sugar”? (a) we keep it the same (b) we change it (c) we measure it
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) size of the balloon (c) the water temperature
38. 38.⚖️ 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
39. 39.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
40. 40.True or false: sugar is not needed for the yeast balloon. (a) False (b) True

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