Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 83 · 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 is the odd one out? (a) time (b) sugar (c) warm water (d) salt
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) sugar (d) warm water
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a balloon (d) a mirror
4. 4.⚖️ 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
5. 5.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
6. 6.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) boiling hot (d) very salty
7. 7.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) it turns to bread (d) the balloon is smaller
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) dry yeast (c) warm water (d) a balloon
9. 9.⚖️ 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 yeast (c) the water temperature
10. 10.⚖️ 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) False (b) True
11. 11.🔮 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
12. 12.⚖️ 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 sugar (b) the water temperature (c) size of the balloon (d) the amount of yeast
13. 13.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) the yeast is killed (d) it grows faster
14. 14.⚖️ 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) size of the balloon (c) the water temperature (d) the amount of yeast
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) sugar (d) turmeric powder
16. 16.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
17. 17.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
18. 18.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
19. 19.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold slows yeast down (d) cold makes it pink
20. 20.🔍 Which is the odd one out? (a) salt (b) vinegar (c) warm water (d) a magnet
21. 21.🔍 Which is the odd one out? (a) salt (b) vinegar (c) sugar (d) a magnet
22. 22.🔍 Which is the odd one out? (a) vinegar (b) time (c) a magnet (d) sunlight
23. 23.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) vinegar (d) warm water
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a battery cell (d) warm water
25. 25.True or false: sunlight is something yeast needs. (a) False (b) True
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) True (b) False
27. 27.True or false: warm water is needed for the yeast balloon. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) sunlight
29. 29.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
30. 30.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a small bottle (c) a paper clip (d) a magnet
31. 31.⚖️ 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) True (b) False
32. 32.True or false: vinegar is something yeast does not need. (a) True (b) False
33. 33.⚖️ 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 change it (b) we keep it the same (c) we measure it
34. 34.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
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 yeast”? (a) we keep it the same (b) we change it (c) we measure it
36. 36.True or false: warm water is something yeast does not need. (a) False (b) True
37. 37.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) sunlight (d) warm water
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 keep it the same (b) we measure it (c) we change it
39. 39.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) throw it at a wall (d) keep it for a month
40. 40.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed

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