Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 23 · 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 of these is needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) a mirror (d) a magnet
2. 2.True or false: warm water is needed for the yeast balloon. (a) True (b) False
3. 3.🍞 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
4. 4.🔮 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
5. 5.⚖️ 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 change it (b) we measure it (c) we keep it the same
6. 6.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a magnet (c) a battery cell (d) a mirror
7. 7.⚖️ 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
8. 8.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) salt (d) sunlight
9. 9.⚖️ 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 change it (b) we measure it (c) we keep it the same
10. 10.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) a magnet
11. 11.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
12. 12.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) sugar (d) warm water
13. 13.⚖️ 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 amount of sugar (c) the water temperature (d) size of the balloon
14. 14.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
16. 16.True or false: sunlight is something yeast needs. (a) False (b) True
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) a balloon (c) dry yeast (d) warm water
18. 18.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
19. 19.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
20. 20.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
21. 21.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
22. 22.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a paper clip (c) a comb (d) a mirror
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the amount of yeast (c) the same bottles (d) size of the balloon
24. 24.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
25. 25.True or false: vinegar is something yeast needs. (a) True (b) False
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a comb (c) dry yeast (d) sugar
27. 27.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
28. 28.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) a small bottle (c) warm water (d) dry yeast
29. 29.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
30. 30.🔍 Which is the odd one out? (a) time (b) vinegar (c) warm water (d) sugar
31. 31.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) turmeric powder (d) sugar
33. 33.🔮 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
34. 34.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
35. 35.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) a balloon (d) turmeric powder
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a mirror (d) a small bottle
37. 37.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to make bread rise (d) to clean floors
38. 38.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
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) size of the balloon (c) the water temperature
40. 40.🔍 Which is the odd one out? (a) time (b) salt (c) sugar (d) warm water

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