Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 589 · 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? True or false: size of the balloon is the one thing we change. (a) True (b) False
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) False (b) True
3. 3.🍞 Which of these is something yeast does not need? (a) warm water (b) sunlight (c) sugar (d) time
4. 4.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) salt
5. 5.⚖️ 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
6. 6.⚖️ 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 yeast (c) the same bottles (d) the water temperature
7. 7.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) the yeast is killed (d) it glows
8. 8.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) salt (d) sugar
9. 9.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) salt (d) time
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) keep it for a month (d) pour it down the sink
12. 12.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) salt (d) time
13. 13.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) warm water (d) a paper clip
15. 15.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) vinegar
16. 16.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
17. 17.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) turmeric powder (c) a battery cell (d) warm water
18. 18.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a tiny living fungus (d) a kind of stone
19. 19.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to make bread rise (d) to clean floors
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 kept the same. (a) False (b) True
21. 21.⚖️ 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) True (b) False
22. 22.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) sugar (d) time
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a comb (d) warm water
24. 24.🍞 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
25. 25.🔍 Which is the odd one out? (a) time (b) sugar (c) sunlight (d) warm water
26. 26.⚖️ 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 keep it the same (b) we change it (c) we measure it
27. 27.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
28. 28.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
29. 29.True or false: warm water is something yeast needs. (a) True (b) False
30. 30.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we measure it (b) we keep it the same (c) we change it
32. 32.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) dry yeast (c) a comb (d) a mirror
33. 33.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) vinegar (d) warm water
35. 35.⚖️ 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) True (b) False
36. 36.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it grows much faster (d) it bursts at once
37. 37.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) time (d) warm water
38. 38.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
39. 39.True or false: warm water is something yeast does not need. (a) True (b) False
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) a balloon (d) a battery cell

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