Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 80 · 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 comb (b) warm water (c) dry yeast (d) sugar
2. 2.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) dry yeast (d) turmeric powder
3. 3.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
4. 4.⚖️ 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 change it (c) we keep it the same
5. 5.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a battery cell (c) a magnet (d) warm water
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) warm water (d) a magnet
7. 7.⚖️ 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 water temperature (c) the same bottles
8. 8.🍞 Which of these is something yeast needs? (a) sunlight (b) warm water (c) vinegar (d) salt
9. 9.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a tiny living fungus (d) a kind of stone
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
11. 11.🛟 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
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) sugar (c) a paper clip (d) a battery cell
13. 13.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) vinegar (d) time
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) warm water (d) a battery cell
15. 15.True or false: salt is something yeast does not need. (a) True (b) False
16. 16.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
17. 17.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) it turns to bread (d) the balloon is smaller
18. 18.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
19. 19.True or false: sugar is something yeast does not need. (a) False (b) True
20. 20.🍞 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
21. 21.⚖️ 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 measure it (b) we keep it the same (c) we change it
22. 22.True or false: sugar is needed for the yeast balloon. (a) False (b) True
23. 23.True or false: vinegar is something yeast needs. (a) True (b) False
24. 24.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a small bottle (c) a mirror (d) turmeric powder
25. 25.🔮 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
26. 26.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
27. 27.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
28. 28.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to wash dishes (d) to colour rice
29. 29.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
30. 30.⚖️ 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) size of the balloon (c) the water temperature (d) the amount of yeast
31. 31.⚖️ 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
32. 32.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) vinegar
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the same bottles (c) size of the balloon (d) the amount of water
35. 35.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
36. 36.True or false: sunlight is something yeast needs. (a) True (b) False
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) turmeric powder (c) warm water (d) sugar
38. 38.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) a magnet (d) salt
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False

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