Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 932 · 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) a magnet (b) time (c) sunlight (d) salt
2. 2.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to wash dishes (d) to clean floors
3. 3.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
4. 4.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a paper clip (d) dry yeast
6. 6.True or false: a comb is needed for the yeast balloon. (a) True (b) False
7. 7.⚖️ 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
8. 8.⚖️ 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 water temperature (c) the amount of sugar (d) the amount of water
9. 9.🔮 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
10. 10.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
11. 11.True or false: sugar is something yeast does not need. (a) True (b) False
12. 12.⚖️ 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
13. 13.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
14. 14.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
15. 15.⚖️ 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) size of the balloon (c) the water temperature (d) the same bottles
16. 16.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
17. 17.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
18. 18.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
19. 19.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a small bottle (c) a mirror (d) a paper clip
20. 20.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) vinegar (d) sunlight
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 sugar”? (a) we keep it the same (b) we change it (c) we measure it
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) False (b) True
23. 23.🍞 Which of these is something yeast does not need? (a) vinegar (b) time (c) warm water (d) sugar
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) turmeric powder (c) sugar (d) warm water
25. 25.⚖️ 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
26. 26.⚖️ 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) False (b) True
27. 27.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold slows yeast down (d) cold kills sugar
28. 28.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
29. 29.True or false: warm water is needed for the yeast balloon. (a) True (b) False
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a comb (d) dry yeast
31. 31.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
32. 32.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) time (b) sugar (c) salt (d) warm water
34. 34.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
35. 35.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) warm water (d) vinegar
36. 36.⚖️ 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
37. 37.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) sugar (c) dry yeast (d) a balloon
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) dry yeast (c) warm water (d) a small bottle
40. 40.🛟 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

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