Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 345 · 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.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
2. 2.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) the yeast is killed (d) it turns to sugar
3. 3.⚖️ 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 keep it the same (b) we change it (c) we measure it
4. 4.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) throw it at a wall (d) put it in your mouth
5. 5.⚖️ 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 water temperature (c) the amount of water
6. 6.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a magnet (c) sugar (d) dry yeast
8. 8.⚖️ 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 yeast (b) size of the balloon (c) the amount of sugar (d) the amount of water
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) a paper clip (d) sugar
10. 10.⚖️ 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
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) sugar (c) a small bottle (d) dry yeast
12. 12.⚖️ 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 measure it (b) we change it (c) we keep it the same
13. 13.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.True or false: salt is something yeast does not need. (a) False (b) True
15. 15.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False
17. 17.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
18. 18.⚖️ 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 yeast (b) the water temperature (c) size of the balloon
19. 19.🍞 Which of these is something yeast does not need? (a) salt (b) sugar (c) warm water (d) time
20. 20.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
21. 21.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
22. 22.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) warm water (d) a mirror
23. 23.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it bursts at once (d) it turns yellow
24. 24.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
25. 25.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
26. 26.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) the balloon is bigger (d) it shrinks to nothing
28. 28.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
29. 29.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
31. 31.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
32. 32.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
33. 33.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
34. 34.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
35. 35.⚖️ 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 keep it the same (b) we measure it (c) we change it
36. 36.⚖️ 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 sugar (b) the same bottles (c) the amount of yeast (d) the water temperature
37. 37.True or false: vinegar is something yeast needs. (a) True (b) False
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) turmeric powder (c) warm water (d) a small bottle
39. 39.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) a magnet (d) time
40. 40.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) time (d) sunlight

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