Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 363 · 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) a balloon (b) warm water (c) a mirror (d) a small bottle
2. 2.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a comb (d) a small bottle
4. 4.⚖️ 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
5. 5.True or false: sugar is something yeast does not need. (a) True (b) False
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) a comb (d) a balloon
7. 7.True or false: a magnet is something yeast does not need. (a) True (b) False
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) True (b) False
9. 9.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to colour rice (d) to clean floors
10. 10.True or false: warm water is needed for the yeast balloon. (a) False (b) True
11. 11.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a tiny living fungus (d) a kind of salt
12. 12.⚖️ 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 measure it (b) we change it (c) we keep it the same
13. 13.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it bursts at once (d) it grows much faster
14. 14.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold slows yeast down (d) cold makes it pink
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) the water temperature (b) size of the balloon (c) the amount of yeast
16. 16.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
17. 17.🔍 Which is the odd one out? (a) time (b) salt (c) sugar (d) warm water
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a battery cell (d) a balloon
19. 19.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) a magnet (d) vinegar
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the same bottles (c) the amount of sugar (d) the amount of yeast
21. 21.True or false: sunlight is something yeast does not need. (a) False (b) True
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) False (b) True
23. 23.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to colour it (d) to make it sweet
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) sugar (c) warm water (d) dry yeast
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 kept the same. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) vinegar (b) time (c) sugar (d) warm water
27. 27.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) sunlight
28. 28.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) it shrinks to nothing (d) the balloon is smaller
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) turmeric powder (c) dry yeast (d) a small bottle
30. 30.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
31. 31.True or false: sugar is something yeast needs. (a) False (b) True
32. 32.True or false: a magnet is something yeast needs. (a) True (b) False
33. 33.⚖️ 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
34. 34.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) vinegar (d) warm water
35. 35.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
36. 36.🛟 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
37. 37.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
39. 39.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
40. 40.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) a mirror (d) sugar

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