Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 212 · 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 blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) smoke (d) steam
2. 2.⚖️ 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 change it (b) we measure it (c) we keep it the same
3. 3.⚖️ 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 change it (b) we keep it the same (c) we measure it
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) False (b) True
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) a balloon (c) warm water (d) dry yeast
6. 6.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) sugar (d) a comb
8. 8.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) a battery cell (d) dry yeast
9. 9.⚖️ 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) size of the balloon
10. 10.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold water is heavy (d) cold kills sugar
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a comb (c) dry yeast (d) warm water
12. 12.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) turmeric powder (c) a mirror (d) a battery cell
13. 13.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a tiny living fungus (d) a kind of salt
14. 14.⚖️ 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
15. 15.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
16. 16.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
17. 17.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) salt (d) sugar
18. 18.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
19. 19.🍞 Which of these is something yeast does not need? (a) sugar (b) sunlight (c) time (d) warm water
20. 20.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) turmeric powder (c) a paper clip (d) a battery cell
21. 21.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) boiling hot (d) very salty
22. 22.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) keep it for a month (d) throw it at a wall
23. 23.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a small bottle (c) a paper clip (d) turmeric powder
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of water (b) the water temperature (c) size of the balloon (d) the amount of yeast
25. 25.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
26. 26.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
27. 27.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.⚖️ 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
29. 29.🔮 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
30. 30.True or false: warm water is needed for the yeast balloon. (a) True (b) False
31. 31.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to make bread rise (d) to wash dishes
32. 32.True or false: warm water is something yeast does not need. (a) False (b) True
33. 33.⚖️ 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) False (b) True
34. 34.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
35. 35.True or false: sunlight is something yeast does not need. (a) True (b) False
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) dry yeast (c) warm water (d) sugar
37. 37.🔍 Which is the odd one out? (a) warm water (b) salt (c) a magnet (d) sunlight
38. 38.🔍 Which is the odd one out? (a) warm water (b) time (c) a magnet (d) sugar
39. 39.⚖️ 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
40. 40.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it

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