Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 302 · 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) sugar (b) a magnet (c) a small bottle (d) warm water
2. 2.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a balloon (c) a paper clip (d) a comb
5. 5.True or false: vinegar is something yeast does not need. (a) False (b) True
6. 6.🍞 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
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) dry yeast (c) turmeric powder (d) a mirror
8. 8.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
9. 9.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
10. 10.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
11. 11.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) salt (d) sugar
12. 12.🔮 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 bigger (d) the balloon is smaller
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) carbon dioxide gas (d) air from outside
14. 14.True or false: a comb is needed for the yeast balloon. (a) False (b) True
15. 15.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
16. 16.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) a magnet
17. 17.⚖️ 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
18. 18.⚖️ 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
19. 19.⚖️ 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
20. 20.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
22. 22.⚖️ 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) True (b) False
23. 23.True or false: time is something yeast needs. (a) True (b) False
24. 24.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to clean floors (d) to colour rice
25. 25.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) False (b) True
27. 27.True or false: warm water is something yeast does not need. (a) False (b) True
28. 28.⚖️ 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 keep it the same (b) we change it (c) we measure it
29. 29.True or false: sugar is something yeast does not need. (a) True (b) False
30. 30.True or false: warm water is needed for the yeast balloon. (a) False (b) True
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) a mirror (d) a small bottle
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) True (b) False
33. 33.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) salt (d) sunlight
35. 35.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a small bottle (c) a mirror (d) a paper clip
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) warm water (d) a paper clip
38. 38.🔍 Which is the odd one out? (a) time (b) sunlight (c) warm water (d) sugar
39. 39.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) vinegar
40. 40.⚖️ 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

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