Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 497 · 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) warm water (b) a small bottle (c) dry yeast (d) a mirror
2. 2.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) time (d) sugar
3. 3.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) time (d) a magnet
4. 4.🔍 Which is the odd one out? (a) salt (b) warm water (c) a magnet (d) sunlight
5. 5.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) it is food for yeast (c) to colour it (d) to make it heavy
6. 6.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
7. 7.True or false: sugar is something yeast does not need. (a) True (b) False
8. 8.True or false: sugar is something yeast needs. (a) True (b) False
9. 9.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) keep it for a month (d) pour it down the sink
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a small bottle (c) turmeric powder (d) a battery cell
11. 11.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) sugar (d) salt
12. 12.⚖️ 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
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) sugar (d) a paper clip
14. 14.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
15. 15.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
16. 16.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
17. 17.⚖️ 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
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) sugar (d) a battery cell
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 yeast”? (a) we measure it (b) we keep it the same (c) we change it
20. 20.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
21. 21.⚖️ 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
22. 22.⚖️ 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
23. 23.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
24. 24.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) turmeric powder (d) a balloon
25. 25.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
26. 26.⚖️ 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 same bottles (b) the water temperature (c) size of the balloon (d) the amount of sugar
27. 27.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) a magnet (d) sugar
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a small bottle (d) turmeric powder
29. 29.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
30. 30.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
31. 31.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
32. 32.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it bursts at once (d) it grows much faster
33. 33.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
34. 34.⚖️ 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) the same bottles (d) size of the balloon
35. 35.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold slows yeast down (c) cold makes it pink (d) cold kills sugar
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a battery cell (c) a small bottle (d) dry yeast
37. 37.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) vinegar
38. 38.⚖️ 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
39. 39.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a balloon (c) a small bottle (d) sugar

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