Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 371 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) warm water (c) sugar (d) dry yeast
2. 2.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
3. 3.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
4. 4.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it turns to sugar (d) it glows
5. 5.🍞 Which of these is something yeast needs? (a) warm water (b) salt (c) a magnet (d) sunlight
6. 6.⚖️ 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
7. 7.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
8. 8.⚖️ 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 yeast (c) the amount of water (d) the amount of sugar
9. 9.🍞 Which of these is something yeast needs? (a) time (b) sunlight (c) a magnet (d) vinegar
10. 10.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it turns yellow (d) it grows much faster
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a magnet (d) warm water
12. 12.True or false: salt is something yeast does not need. (a) False (b) True
13. 13.🍞 Which of these is something yeast does not need? (a) time (b) a magnet (c) sugar (d) warm water
14. 14.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) put it in your mouth (d) pour it down the sink
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 water temperature (b) the amount of water (c) size of the balloon (d) the amount of yeast
16. 16.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
17. 17.⚖️ 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 keep it the same (b) we measure it (c) we change it
18. 18.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) sugar (d) a magnet
19. 19.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
20. 20.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) steam (d) smoke
21. 21.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) sugar (d) salt
22. 22.⚖️ 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 keep it the same (b) we change it (c) we measure it
23. 23.⚖️ 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 measure it (c) we keep it the same
24. 24.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
26. 26.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
27. 27.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to wash dishes (d) to make bread rise
28. 28.⚖️ 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
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) a magnet (d) warm water
30. 30.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) warm water (c) a small bottle (d) sugar
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a mirror (c) a balloon (d) dry yeast
33. 33.⚖️ 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 measure it (c) we change it
34. 34.⚖️ 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) True (b) False
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a paper clip (c) a small bottle (d) sugar
36. 36.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold slows yeast down (c) cold makes it pink (d) cold kills sugar
37. 37.True or false: warm water is something yeast needs. (a) False (b) True
38. 38.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a comb (c) a balloon (d) a magnet
40. 40.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed

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