Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 372 · 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 balloon (b) sugar (c) turmeric powder (d) dry yeast
2. 2.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) vinegar (d) warm water
3. 3.True or false: time is something yeast needs. (a) False (b) True
4. 4.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
5. 5.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
6. 6.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
7. 7.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a tiny living fungus (d) a kind of sugar
8. 8.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) salt
9. 9.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) the yeast is killed (d) it turns to sugar
10. 10.🔍 Which is the odd one out? (a) sugar (b) time (c) sunlight (d) warm water
11. 11.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it turns to bread (d) it shrinks to nothing
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a comb (c) sugar (d) dry yeast
13. 13.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sunlight (d) sugar
14. 14.⚖️ 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 water temperature (c) the amount of water (d) size of the balloon
15. 15.⚖️ 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 keep it the same (c) we measure it
16. 16.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it bursts at once (d) it turns yellow
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) True (b) False
18. 18.True or false: sunlight is something yeast does not need. (a) False (b) True
19. 19.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) turmeric powder (d) dry yeast
21. 21.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
22. 22.True or false: warm water is something yeast needs. (a) True (b) False
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a battery cell (d) a balloon
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) warm water (c) sugar (d) a balloon
25. 25.🍞 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
26. 26.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) warm water (d) a comb
27. 27.⚖️ 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
28. 28.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
29. 29.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
30. 30.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
31. 31.⚖️ 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 amount of water (b) the same bottles (c) the water temperature (d) size of the balloon
32. 32.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
34. 34.🍞 Which of these is something yeast does not need? (a) sugar (b) a magnet (c) time (d) warm water
35. 35.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
36. 36.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) dry yeast (c) a magnet (d) a battery cell
37. 37.🍞 Which of these is something yeast does not need? (a) time (b) vinegar (c) warm water (d) sugar
38. 38.True or false: sugar is needed for the yeast balloon. (a) True (b) False
39. 39.True or false: sugar is something yeast needs. (a) False (b) True
40. 40.⚖️ 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) False (b) True

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