Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 431 · 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) vinegar (b) salt (c) sunlight (d) warm water
2. 2.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it sweet (d) to make it heavy
3. 3.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
4. 4.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to clean floors (d) to colour rice
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) True (b) False
6. 6.⚖️ 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 yeast (b) the amount of water (c) size of the balloon (d) the water temperature
7. 7.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
8. 8.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
9. 9.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) throw it at a wall (d) keep it for a month
10. 10.⚖️ 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
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 kept the same. (a) True (b) False
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a battery cell (c) a small bottle (d) dry yeast
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a comb (c) warm water (d) a small bottle
14. 14.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) a magnet (d) dry yeast
16. 16.⚖️ 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
17. 17.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) salt (d) sugar
18. 18.🍞 Which of these is something yeast needs? (a) salt (b) sugar (c) a magnet (d) sunlight
19. 19.⚖️ 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
20. 20.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
21. 21.True or false: time is something yeast does not need. (a) True (b) False
22. 22.⚖️ 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 change it (b) we measure it (c) we keep it the same
23. 23.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
24. 24.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
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.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it grows very little (d) it bursts at once
27. 27.🍞 Which of these is something yeast needs? (a) a magnet (b) time (c) vinegar (d) salt
28. 28.True or false: time is something yeast needs. (a) False (b) True
29. 29.True or false: a magnet is something yeast needs. (a) True (b) False
30. 30.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
31. 31.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a battery cell (c) turmeric powder (d) a magnet
32. 32.⚖️ 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
33. 33.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) sunlight (d) a magnet
34. 34.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) it glows (d) the yeast is killed
35. 35.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.True or false: salt is something yeast does not need. (a) False (b) True
37. 37.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
38. 38.True or false: sugar is something yeast does not need. (a) False (b) True
39. 39.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
40. 40.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it

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