Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 556 · 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 is the odd one out? (a) a magnet (b) sugar (c) vinegar (d) salt
2. 2.True or false: time is something yeast needs. (a) False (b) True
3. 3.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a small bottle (c) warm water (d) a balloon
5. 5.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) a magnet
6. 6.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) time (d) sunlight
7. 7.⚖️ 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
8. 8.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a tiny living fungus (d) a kind of sugar
9. 9.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
10. 10.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it grows much faster (d) it turns yellow
11. 11.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
13. 13.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
14. 14.⚖️ 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
15. 15.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the same bottles (c) the water temperature
16. 16.🔍 Which is the odd one out? (a) time (b) vinegar (c) a magnet (d) salt
17. 17.True or false: a comb is needed for the yeast balloon. (a) False (b) True
18. 18.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
19. 19.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
20. 20.True or false: sugar is needed for the yeast balloon. (a) False (b) True
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a balloon (d) turmeric powder
22. 22.True or false: time is something yeast does not need. (a) True (b) False
23. 23.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to clean floors (d) to make bread rise
24. 24.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) the balloon is smaller (d) it turns to bread
25. 25.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) warm water (c) a battery cell (d) a magnet
26. 26.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
27. 27.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) time (d) sugar
28. 28.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
29. 29.⚖️ 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
30. 30.⚖️ 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 keep it the same (c) we measure it
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) size of the balloon (c) the amount of water
32. 32.⚖️ 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 measure it (c) we change it
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a paper clip (d) a small bottle
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) warm water (c) a balloon (d) dry yeast
35. 35.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
36. 36.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) sunlight (d) warm water
37. 37.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
38. 38.True or false: vinegar is something yeast does not need. (a) False (b) True
39. 39.⚖️ 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 same bottles (b) the water temperature (c) size of the balloon (d) the amount of yeast
40. 40.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it

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