Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 538 · 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.⚖️ 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 change it (b) we measure it (c) we keep it the same
2. 2.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a comb (c) warm water (d) a small bottle
5. 5.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) keep it for a month (d) put it in your mouth
6. 6.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
7. 7.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a battery cell (c) warm water (d) a balloon
9. 9.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
10. 10.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
11. 11.True or false: time is something yeast needs. (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.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it glows (d) it grows faster
14. 14.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
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 keep it the same (b) we measure it (c) we change it
16. 16.🍞 Which of these is something yeast needs? (a) vinegar (b) time (c) sunlight (d) a magnet
17. 17.⚖️ 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 amount of sugar (c) the water temperature (d) the amount of yeast
18. 18.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
19. 19.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) True (b) False
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a magnet (c) warm water (d) dry yeast
21. 21.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) salt (d) time
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) sugar (d) a paper clip
24. 24.🍞 Which of these is something yeast needs? (a) salt (b) warm water (c) vinegar (d) sunlight
25. 25.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) a paper clip (d) dry yeast
26. 26.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold slows yeast down (c) cold water is heavy (d) cold kills sugar
27. 27.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
28. 28.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
29. 29.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
30. 30.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) time (d) sugar
31. 31.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to wash dishes (d) to clean floors
32. 32.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a kind of stone (d) a tiny living fungus
33. 33.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
34. 34.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
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: a mirror is needed for the yeast balloon. (a) False (b) True
37. 37.⚖️ 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 change it (b) we measure it (c) we keep it the same
38. 38.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
39. 39.⚖️ 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 measure it (b) we change it (c) we keep it the same
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a balloon (c) a mirror (d) a magnet

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