Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 651 · 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.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
2. 2.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
3. 3.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a balloon (d) a magnet
4. 4.⚖️ 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) True (b) False
5. 5.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
6. 6.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a battery cell (d) sugar
8. 8.⚖️ 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 amount of sugar (c) the water temperature
9. 9.🧺 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
10. 10.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) put it in your mouth (d) keep it for a month
12. 12.⚖️ 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
13. 13.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
14. 14.🍞 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
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) dry yeast (d) a paper clip
16. 16.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
17. 17.True or false: warm water is something yeast does not need. (a) False (b) True
18. 18.True or false: warm water is something yeast needs. (a) False (b) True
19. 19.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) False (b) True
21. 21.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
22. 22.⚖️ 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) the amount of water (d) size of the balloon
23. 23.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) carbon dioxide gas (d) steam
24. 24.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to make bread rise (d) to clean floors
25. 25.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) sugar (d) salt
26. 26.True or false: sugar is something yeast needs. (a) False (b) True
27. 27.True or false: time is something yeast does not need. (a) False (b) True
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a comb (c) a magnet (d) turmeric powder
29. 29.🍞 Which of these is something yeast does not need? (a) warm water (b) vinegar (c) sugar (d) time
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) turmeric powder (c) sugar (d) a small bottle
31. 31.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
32. 32.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
33. 33.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
34. 34.🔍 Which is the odd one out? (a) a magnet (b) salt (c) sunlight (d) sugar
35. 35.🔍 Which is the odd one out? (a) time (b) sugar (c) a magnet (d) warm water
36. 36.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
37. 37.🍞 Which of these is something yeast needs? (a) warm water (b) sunlight (c) vinegar (d) salt
38. 38.🔍 Which is the odd one out? (a) a magnet (b) salt (c) warm water (d) vinegar
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a small bottle (c) dry yeast (d) sugar
40. 40.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) a magnet

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