Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 810 · 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 a small bottle for the yeast balloon? (a) needed (b) not needed
2. 2.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
3. 3.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a balloon (c) a mirror (d) a comb
4. 4.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “size of the balloon”? (a) we keep it the same (b) we change it (c) we measure it
6. 6.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a battery cell (d) dry yeast
8. 8.True or false: vinegar is something yeast does not need. (a) False (b) True
9. 9.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) time (d) sugar
10. 10.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
11. 11.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
12. 12.True or false: sunlight is something yeast does not need. (a) False (b) True
13. 13.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) the yeast is killed (d) it turns to sugar
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of yeast (b) the water temperature (c) size of the balloon
15. 15.True or false: vinegar is something yeast needs. (a) False (b) True
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) sugar (c) warm water (d) a balloon
17. 17.🧺 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
18. 18.🍞 Which of these is something yeast needs? (a) time (b) salt (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 water temperature”? (a) we keep it the same (b) we change it (c) we measure it
20. 20.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to make bread rise (d) to clean floors
21. 21.True or false: time is something yeast does not need. (a) True (b) False
22. 22.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) the balloon is bigger (d) it shrinks to nothing
23. 23.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) warm water (d) salt
24. 24.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
25. 25.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold slows yeast down (d) cold water is heavy
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) dry yeast (d) a comb
27. 27.🔍 Which is the odd one out? (a) vinegar (b) salt (c) sugar (d) a magnet
28. 28.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it turns yellow (d) it bursts at once
29. 29.⚖️ 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
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a magnet (c) dry yeast (d) a balloon
31. 31.🛟 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
32. 32.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
33. 33.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
34. 34.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
36. 36.True or false: salt is something yeast needs. (a) False (b) True
37. 37.⚖️ 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 sugar (b) the amount of yeast (c) the water temperature (d) size of the balloon
38. 38.⚖️ 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
39. 39.🧺 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
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) False (b) True

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