Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 305 · 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.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) throw it at a wall (d) pour it down the sink
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a comb (d) a small bottle
3. 3.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it shrinks to nothing (d) it turns to bread
4. 4.True or false: sunlight is something yeast needs. (a) False (b) True
5. 5.⚖️ 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
6. 6.🍞 Which of these is something yeast needs? (a) time (b) vinegar (c) sunlight (d) a magnet
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a magnet (c) turmeric powder (d) a comb
8. 8.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a comb (c) sugar (d) dry yeast
9. 9.🔍 Which is the odd one out? (a) salt (b) time (c) warm water (d) sugar
10. 10.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
11. 11.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) the yeast is killed (d) it turns to sugar
12. 12.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold makes it pink (d) cold slows yeast down
13. 13.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
14. 14.⚖️ 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 water temperature (c) the amount of yeast (d) size of the balloon
15. 15.True or false: vinegar is something yeast does not need. (a) True (b) False
16. 16.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
17. 17.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to wash dishes (d) to clean floors
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) size of the balloon (b) the water temperature (c) the same bottles
19. 19.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
20. 20.⚖️ 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
21. 21.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
22. 22.⚖️ 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
23. 23.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) True (b) False
25. 25.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) salt (b) vinegar (c) sugar (d) sunlight
28. 28.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) sugar (d) vinegar
29. 29.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
30. 30.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) turmeric powder (d) warm water
32. 32.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
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 measure it (b) we keep it the same (c) we change it
34. 34.True or false: time is something yeast does not need. (a) True (b) False
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 change it (c) we measure 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 water temperature (b) the same bottles (c) the amount of sugar (d) the amount of yeast
37. 37.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
38. 38.True or false: sugar is needed for the yeast balloon. (a) False (b) True
39. 39.🍞 Which of these is something yeast does not need? (a) time (b) sunlight (c) sugar (d) warm water
40. 40.True or false: a balloon is needed for the yeast balloon. (a) False (b) True

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