Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 360 · 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.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) sunlight
2. 2.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
3. 3.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) carbon dioxide gas (d) air from outside
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True
5. 5.True or false: a magnet is something yeast needs. (a) True (b) False
6. 6.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) the balloon is smaller (d) it shrinks to nothing
7. 7.True or false: sunlight is something yeast needs. (a) True (b) False
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) sugar (c) warm water (d) a small bottle
9. 9.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
10. 10.⚖️ 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 measure it (b) we change it (c) we keep it the same
11. 11.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold makes it pink (d) cold slows yeast down
12. 12.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
13. 13.⚖️ 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) size of the balloon (c) the water temperature (d) the same bottles
14. 14.🔍 Which is the odd one out? (a) sunlight (b) time (c) salt (d) vinegar
15. 15.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) the yeast is killed (c) it glows (d) it grows faster
16. 16.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
17. 17.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) a small bottle (d) a mirror
18. 18.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
19. 19.True or false: vinegar is something yeast does not need. (a) True (b) False
20. 20.📘 What is yeast? (a) a kind of salt (b) a tiny living fungus (c) a kind of stone (d) a kind of sugar
21. 21.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to make bread rise (d) to wash dishes
22. 22.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) dry yeast (d) a magnet
24. 24.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
25. 25.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
26. 26.🍞 Which of these is something yeast needs? (a) salt (b) sugar (c) sunlight (d) a magnet
27. 27.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) put it in your mouth (d) pour it down the sink
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) dry yeast (c) turmeric powder (d) a mirror
29. 29.⚖️ 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
30. 30.🔍 Which is the odd one out? (a) salt (b) sugar (c) time (d) warm water
31. 31.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
32. 32.⚖️ 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) size of the balloon (b) the amount of sugar (c) the same bottles (d) the water temperature
33. 33.⚖️ 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
34. 34.⚖️ 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
35. 35.True or false: sugar is something yeast does not need. (a) False (b) True
36. 36.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
37. 37.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
38. 38.🍞 Which of these is something yeast does not need? (a) salt (b) sugar (c) time (d) warm water
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) dry yeast (d) sugar
40. 40.True or false: sugar is needed for the yeast balloon. (a) True (b) False

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