Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 559 · 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 balloon is not needed for the yeast balloon. (a) False (b) True
2. 2.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) salt
3. 3.⚖️ 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
4. 4.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) the balloon is bigger (d) it turns to bread
5. 5.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.True or false: a comb is needed for the yeast balloon. (a) True (b) False
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) turmeric powder (c) dry yeast (d) a small bottle
8. 8.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) ice cold (d) very salty
9. 9.⚖️ 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 water temperature (c) the amount of water (d) size of the balloon
10. 10.⚖️ 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 yeast
11. 11.⚖️ 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
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 yeast”? (a) we change it (b) we keep it the same (c) we measure it
13. 13.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) keep it for a month (d) throw it at a wall
14. 14.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a magnet (c) turmeric powder (d) a paper clip
16. 16.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
17. 17.🔮 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
18. 18.⚖️ 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
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) a small bottle (c) warm water (d) sugar
20. 20.🔍 Which is the odd one out? (a) time (b) vinegar (c) a magnet (d) salt
21. 21.🔍 Which is the odd one out? (a) warm water (b) salt (c) sugar (d) time
22. 22.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a paper clip (d) a small bottle
24. 24.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) vinegar (d) warm water
25. 25.True or false: time is something yeast does not need. (a) False (b) True
26. 26.True or false: sunlight is something yeast needs. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) time (b) warm water (c) a magnet (d) sugar
28. 28.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) time (d) vinegar
30. 30.⚖️ 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
31. 31.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
32. 32.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) warm water (d) vinegar
33. 33.True or false: sunlight is something yeast does not need. (a) False (b) True
34. 34.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold slows yeast down (d) cold makes it pink
35. 35.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
36. 36.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to make it sweet (d) to colour it
37. 37.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
38. 38.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
39. 39.🍞 Which of these is something yeast needs? (a) vinegar (b) sugar (c) salt (d) a magnet
40. 40.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a battery cell (d) warm water

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