Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 437 · 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.True or false: sugar is something yeast does not need. (a) False (b) True
2. 2.True or false: salt is something yeast needs. (a) True (b) False
3. 3.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) keep it for a month (d) put it in your mouth
4. 4.🍞 Which of these is something yeast does not need? (a) sunlight (b) sugar (c) time (d) warm water
5. 5.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) warm water (d) turmeric powder
7. 7.🔍 Which is the odd one out? (a) sunlight (b) time (c) vinegar (d) a magnet
8. 8.⚖️ 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
9. 9.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) vinegar (d) sugar
10. 10.⚖️ 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 keep it the same (b) we measure it (c) we change it
11. 11.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
12. 12.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a tiny living fungus (d) a kind of stone
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) warm water (c) a small bottle (d) a balloon
14. 14.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) warm water (d) sunlight
15. 15.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) time (d) vinegar
16. 16.⚖️ 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 change it (b) we measure it (c) we keep it the same
17. 17.True or false: salt is something yeast does not need. (a) False (b) True
18. 18.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
19. 19.🍞 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
20. 20.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to colour rice (d) to make bread rise
22. 22.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
23. 23.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
24. 24.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
25. 25.⚖️ 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
26. 26.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
27. 27.🍞 Which of these is something yeast does not need? (a) vinegar (b) time (c) sugar (d) warm water
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
29. 29.⚖️ 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
30. 30.⚖️ 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 change it (b) we keep it the same (c) we measure it
31. 31.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster
32. 32.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
33. 33.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) it is food for yeast (d) to make it heavy
34. 34.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) sugar (d) sunlight
35. 35.True or false: time is something yeast needs. (a) False (b) True
36. 36.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
37. 37.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it turns to bread (d) it shrinks to nothing
38. 38.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
39. 39.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
40. 40.⚖️ 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 keep it the same (c) we change it

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