Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 99 · 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.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
2. 2.⚖️ 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
3. 3.🍞 Which of these is something yeast needs? (a) time (b) salt (c) a magnet (d) vinegar
4. 4.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
5. 5.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) vinegar (d) sugar
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a balloon (d) a paper clip
7. 7.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
8. 8.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it grows much faster (d) it turns yellow
9. 9.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a magnet (d) dry yeast
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a small bottle (d) turmeric powder
12. 12.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) vinegar
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the amount of sugar (c) the water temperature
14. 14.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to clean floors (d) to colour rice
15. 15.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) pour it down the sink (d) throw it at a wall
16. 16.🔍 Which is the odd one out? (a) vinegar (b) time (c) warm water (d) sugar
17. 17.⚖️ 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 same bottles (c) the amount of sugar (d) the amount of yeast
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the same bottles (c) the water temperature
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) dry yeast (c) sugar (d) a balloon
20. 20.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it turns to sugar (d) it glows
21. 21.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
22. 22.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) time (d) sugar
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) dry yeast (c) sugar (d) a balloon
24. 24.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
25. 25.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) vinegar (d) a magnet
26. 26.⚖️ 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
27. 27.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) sunlight
30. 30.True or false: time is something yeast does not need. (a) False (b) True
31. 31.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
32. 32.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
33. 33.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
34. 34.True or false: sugar is something yeast does not need. (a) False (b) True
35. 35.🍞 Which of these is something yeast needs? (a) warm water (b) vinegar (c) salt (d) a magnet
36. 36.⚖️ 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 measure it (b) we change it (c) we keep it the same
37. 37.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) dry yeast (c) a magnet (d) a paper clip
38. 38.🍞 Which of these is something yeast does not need? (a) time (b) a magnet (c) warm water (d) sugar
39. 39.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a mirror (d) dry yeast

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