Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 103 · 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.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
2. 2.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to wash dishes (d) to clean floors
3. 3.True or false: sugar is something yeast does not need. (a) False (b) True
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a balloon (c) dry yeast (d) turmeric powder
5. 5.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
6. 6.⚖️ 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) the amount of water (c) size of the balloon
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) dry yeast (d) a comb
8. 8.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) salt
9. 9.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
10. 10.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it grows very little (d) it turns yellow
11. 11.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
12. 12.⚖️ 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 change it (b) we keep it the same (c) we measure it
13. 13.⚖️ 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
14. 14.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) to make it sweet (d) it is food for yeast
15. 15.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) the balloon is bigger (d) it shrinks to nothing
16. 16.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
17. 17.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) time (d) warm water
18. 18.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
19. 19.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) salt
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a mirror (c) sugar (d) dry yeast
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) the water temperature (c) size of the balloon
22. 22.⚖️ 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
23. 23.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) sugar (d) salt
24. 24.⚖️ 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) True (b) False
25. 25.⚖️ 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
26. 26.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
27. 27.True or false: a comb is needed for the yeast balloon. (a) True (b) False
28. 28.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a magnet (c) warm water (d) a small bottle
29. 29.True or false: sugar is needed for the yeast balloon. (a) True (b) False
30. 30.True or false: warm water is something yeast does not need. (a) True (b) False
31. 31.🍞 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
32. 32.⚖️ 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 amount of yeast (b) the amount of water (c) size of the balloon (d) the water temperature
33. 33.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
34. 34.⚖️ 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) True (b) False
35. 35.⚖️ 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) the amount of sugar (c) size of the balloon
36. 36.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
37. 37.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) sugar (d) a mirror
39. 39.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) a battery cell (d) dry yeast

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