Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 430 · 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 something yeast needs? (a) sunlight (b) salt (c) a magnet (d) time
2. 2.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold slows yeast down (d) cold kills sugar
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a paper clip (c) a magnet (d) a comb
4. 4.True or false: warm water is something yeast needs. (a) True (b) False
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
6. 6.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) salt (d) vinegar
7. 7.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it grows very little (d) it turns yellow
8. 8.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
9. 9.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) a magnet (d) sugar
10. 10.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) sugar (d) salt
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a balloon (d) a battery cell
12. 12.⚖️ 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 measure it (b) we keep it the same (c) we change it
13. 13.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a magnet (d) a small bottle
15. 15.⚖️ 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) size of the balloon (c) the water temperature (d) the amount of water
16. 16.True or false: sugar is something yeast needs. (a) False (b) True
17. 17.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) it turns to bread (d) the balloon is smaller
18. 18.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
19. 19.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
20. 20.⚖️ 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) True (b) False
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of yeast”? (a) we change it (b) we measure it (c) we keep it the same
22. 22.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
23. 23.⚖️ 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
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) turmeric powder (d) sugar
25. 25.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
26. 26.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
27. 27.⚖️ 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) False (b) True
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) a paper clip (d) sugar
29. 29.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to wash dishes (d) to make bread rise
30. 30.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) a magnet (d) sugar
31. 31.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
32. 32.⚖️ 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 keep it the same (b) we change it (c) we measure it
33. 33.⚖️ 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
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) a balloon (d) sugar
35. 35.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
37. 37.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
38. 38.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.True or false: salt is something yeast needs. (a) True (b) False
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) True (b) False

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