Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 255 · 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.⚖️ 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
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a mirror (d) warm water
3. 3.⚖️ 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 amount of water (c) the water temperature
4. 4.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
5. 5.⚖️ 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
6. 6.⚖️ 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
7. 7.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) False (b) True
9. 9.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
10. 10.⚖️ 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 amount of sugar (c) the water temperature (d) size of the balloon
11. 11.⚖️ 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 change it (b) we keep it the same (c) we measure it
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) pour it down the sink (d) throw it at a wall
13. 13.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) the yeast is killed (d) it grows faster
14. 14.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) time (d) sugar
15. 15.🔍 Which is the odd one out? (a) time (b) sugar (c) salt (d) warm water
16. 16.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
17. 17.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it grows much faster (d) it turns yellow
18. 18.🔍 Which is the odd one out? (a) sunlight (b) salt (c) a magnet (d) warm water
19. 19.True or false: sugar is needed for the yeast balloon. (a) False (b) True
20. 20.⚖️ 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 measure it (b) we change it (c) we keep it the same
21. 21.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a battery cell (c) a small bottle (d) dry yeast
23. 23.🔍 Which is the odd one out? (a) vinegar (b) salt (c) sunlight (d) sugar
24. 24.True or false: sunlight is something yeast needs. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) warm water (b) sugar (c) a magnet (d) time
26. 26.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) a comb (d) sugar
28. 28.🍞 Which of these is something yeast does not need? (a) sunlight (b) sugar (c) time (d) warm water
29. 29.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) steam (d) smoke
30. 30.True or false: sugar is something yeast needs. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) vinegar (d) time
32. 32.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) sugar (c) a battery cell (d) a mirror
33. 33.⚖️ 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) the amount of sugar (c) size of the balloon (d) the water temperature
34. 34.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a comb (c) a magnet (d) a paper clip
35. 35.🔮 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
36. 36.True or false: a magnet is something yeast needs. (a) True (b) False
37. 37.⚖️ 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) False (b) True
38. 38.⚖️ 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 keep it the same (c) we measure it
39. 39.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
40. 40.True or false: warm water is something yeast does not need. (a) False (b) True

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