Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 491 · 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.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
2. 2.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
3. 3.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) vinegar
4. 4.🔍 Which is the odd one out? (a) time (b) salt (c) warm water (d) sugar
5. 5.🍞 Which of these is something yeast needs? (a) time (b) a magnet (c) sunlight (d) vinegar
6. 6.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
7. 7.True or false: sugar is something yeast needs. (a) False (b) True
8. 8.True or false: vinegar is something yeast does not need. (a) True (b) False
9. 9.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) a magnet (d) sunlight
10. 10.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a tiny living fungus (d) a kind of sugar
11. 11.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
12. 12.🍞 Which of these is something yeast does not need? (a) sunlight (b) sugar (c) warm water (d) time
13. 13.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) warm water (d) a magnet
14. 14.⚖️ 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 same bottles (b) the water temperature (c) size of the balloon (d) the amount of water
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 same bottles (b) size of the balloon (c) the water temperature (d) the amount of yeast
16. 16.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) dry yeast (d) a battery cell
17. 17.⚖️ 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 measure it (b) we keep it the same (c) we change it
18. 18.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a balloon (c) a mirror (d) warm water
20. 20.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) warm water (d) a magnet
21. 21.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) keep it for a month (d) pour it down the sink
22. 22.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
23. 23.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) sugar (d) time
24. 24.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
25. 25.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
26. 26.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) it shrinks to nothing (d) the balloon is smaller
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a small bottle (d) turmeric powder
28. 28.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
29. 29.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
30. 30.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) sugar (d) a magnet
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) sugar (d) a magnet
32. 32.🔍 Which is the odd one out? (a) salt (b) sunlight (c) time (d) a magnet
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) warm water (d) a comb
34. 34.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a paper clip (d) a small bottle
36. 36.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
37. 37.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold slows yeast down (d) cold kills sugar
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) a small bottle (c) sugar (d) a balloon
39. 39.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we keep it the same (b) we measure it (c) we change it

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