Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 852 · 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.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
2. 2.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to make bread rise (d) to wash dishes
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) dry yeast (d) a paper clip
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) turmeric powder (c) a small bottle (d) sugar
5. 5.⚖️ 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 same bottles (c) size of the balloon (d) the amount of yeast
6. 6.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a battery cell (d) a small bottle
8. 8.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) put it in your mouth (d) keep it for a month
9. 9.True or false: warm water is needed for the yeast balloon. (a) False (b) True
10. 10.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) the yeast is killed (c) it grows faster (d) it glows
11. 11.True or false: a magnet is something yeast needs. (a) False (b) True
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) warm water (c) a mirror (d) a paper clip
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a mirror (d) sugar
14. 14.🔍 Which is the odd one out? (a) salt (b) vinegar (c) time (d) sunlight
15. 15.⚖️ 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 measure it (b) we change it (c) we keep it the same
16. 16.⚖️ 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
17. 17.🍞 Which of these is something yeast does not need? (a) salt (b) time (c) warm water (d) sugar
18. 18.⚖️ 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) the amount of water (d) size of the balloon
19. 19.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
20. 20.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold makes it pink (d) cold slows yeast down
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) a comb (d) dry yeast
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) size of the balloon (c) the same bottles
23. 23.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
24. 24.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) time (d) a magnet
25. 25.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) warm water (d) a balloon
27. 27.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) sunlight (d) a magnet
28. 28.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
30. 30.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
31. 31.True or false: vinegar is something yeast needs. (a) False (b) True
32. 32.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
33. 33.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
34. 34.True or false: sugar is something yeast does not need. (a) False (b) True
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) a magnet (d) sugar
36. 36.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
37. 37.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.True or false: warm water is something yeast needs. (a) True (b) False
39. 39.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
40. 40.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a small bottle (c) a battery cell (d) a paper clip

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