Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 711 · 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 comb is not needed for the yeast balloon. (a) False (b) True
2. 2.True or false: warm water is something yeast does not need. (a) True (b) False
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) the same bottles (b) size of the balloon (c) the amount of yeast (d) the water temperature
4. 4.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold slows yeast down (c) cold kills sugar (d) cold water is heavy
5. 5.⚖️ 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
6. 6.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) a magnet (d) sugar
7. 7.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.⚖️ 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) True (b) False
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 sugar”? (a) we measure it (b) we change it (c) we keep it the same
10. 10.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
11. 11.🔮 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
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) a balloon (c) dry yeast (d) sugar
13. 13.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
14. 14.⚖️ 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
15. 15.True or false: vinegar is something yeast needs. (a) False (b) True
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) sunlight (d) salt
18. 18.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
19. 19.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
20. 20.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.⚖️ 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 water (b) size of the balloon (c) the water temperature
22. 22.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
23. 23.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
24. 24.True or false: salt is something yeast needs. (a) False (b) True
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) dry yeast (d) a paper clip
26. 26.True or false: time is something yeast needs. (a) True (b) False
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a mirror (c) dry yeast (d) a small bottle
28. 28.🔮 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
29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) False (b) True
30. 30.⚖️ 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 same bottles (c) the water temperature (d) the amount of sugar
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a balloon (c) dry yeast (d) warm water
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
33. 33.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a small bottle (d) a paper clip
35. 35.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) a battery cell (d) warm water
36. 36.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
37. 37.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a comb (c) a paper clip (d) a mirror
38. 38.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) sugar (d) sunlight
39. 39.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
40. 40.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) sunlight (d) warm water

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