Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 366 · 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.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
2. 2.⚖️ 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 keep it the same (b) we change it (c) we measure it
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of sugar (c) the water temperature (d) the amount of yeast
4. 4.🍞 Which of these is something yeast needs? (a) sunlight (b) sugar (c) a magnet (d) vinegar
5. 5.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.True or false: sugar is needed for the yeast balloon. (a) False (b) True
7. 7.🛟 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
8. 8.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a small bottle (c) a mirror (d) a magnet
10. 10.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
11. 11.True or false: a comb is needed for the yeast balloon. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) sugar (b) salt (c) warm water (d) time
13. 13.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a paper clip (c) sugar (d) dry yeast
15. 15.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to make bread rise (d) to wash dishes
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) False (b) True
17. 17.🍞 Which of these is something yeast needs? (a) warm water (b) sunlight (c) a magnet (d) vinegar
18. 18.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) it shrinks to nothing (d) the balloon is smaller
19. 19.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
20. 20.True or false: a magnet is something yeast does not need. (a) False (b) True
21. 21.True or false: warm water is something yeast needs. (a) True (b) False
22. 22.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it grows faster (d) it turns to sugar
23. 23.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a paper clip (c) a mirror (d) a magnet
24. 24.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
25. 25.⚖️ 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
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) warm water (c) a balloon (d) a small bottle
27. 27.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold water is heavy (d) cold slows yeast down
29. 29.⚖️ 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
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) turmeric powder (c) a balloon (d) dry yeast
31. 31.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
32. 32.🍞 Which of these is something yeast does not need? (a) vinegar (b) warm water (c) time (d) sugar
33. 33.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) salt (d) warm water
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) dry yeast (d) a mirror
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) dry yeast (d) a magnet
36. 36.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
37. 37.⚖️ 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) False (b) True
38. 38.⚖️ 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) size of the balloon (b) the amount of yeast (c) the water temperature (d) the amount of water
39. 39.True or false: a magnet is something yeast needs. (a) False (b) True
40. 40.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it

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