Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 860 · 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 battery cell (b) sugar (c) warm water (d) a small bottle
2. 2.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold water is heavy (d) cold makes it pink
3. 3.⚖️ 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
4. 4.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
5. 5.⚖️ 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
6. 6.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it grows very little (d) it bursts at once
7. 7.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
8. 8.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) a magnet
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a magnet (c) a balloon (d) warm water
10. 10.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) it is food for yeast (d) to make it sweet
11. 11.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
12. 12.True or false: time is something yeast does not need. (a) False (b) True
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) False (b) True
14. 14.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.True or false: sugar is something yeast needs. (a) True (b) False
16. 16.🍞 Which of these is something yeast needs? (a) sugar (b) a magnet (c) vinegar (d) salt
17. 17.⚖️ 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 change it (b) we measure it (c) we keep it the same
18. 18.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) salt (d) warm water
19. 19.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
20. 20.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we measure it (b) we keep it the same (c) we change it
22. 22.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
23. 23.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) put it in your mouth (d) pour it down the sink
24. 24.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
25. 25.🔍 Which is the odd one out? (a) vinegar (b) time (c) sugar (d) warm water
26. 26.True or false: sunlight is something yeast does not need. (a) True (b) False
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a comb (c) a small bottle (d) sugar
28. 28.True or false: a magnet is something yeast does not need. (a) False (b) True
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) warm water (c) sugar (d) dry yeast
30. 30.⚖️ 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
31. 31.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
32. 32.True or false: vinegar is something yeast needs. (a) True (b) False
33. 33.True or false: time is something yeast needs. (a) True (b) False
34. 34.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
35. 35.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
36. 36.⚖️ 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) False (b) True
37. 37.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) turmeric powder (c) warm water (d) a mirror
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.⚖️ 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
40. 40.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a battery cell (c) sugar (d) dry yeast

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