Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 448 · 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 vinegar to make gas? (a) yeast does not need it (b) yeast needs it
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.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to wash dishes (d) to make bread rise
4. 4.True or false: vinegar is something yeast needs. (a) True (b) False
5. 5.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it bursts at once (d) it turns yellow
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) a mirror (d) dry yeast
7. 7.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) sunlight (d) warm water
8. 8.⚖️ 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 measure it (b) we change it (c) we keep it the same
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a magnet (c) sugar (d) dry yeast
10. 10.⚖️ 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 sugar (b) the water temperature (c) the same bottles (d) size of the balloon
11. 11.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) sugar (d) a paper clip
13. 13.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
14. 14.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a battery cell (c) warm water (d) sugar
16. 16.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
17. 17.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
18. 18.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
19. 19.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) a magnet (d) sugar
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) dry yeast (d) a comb
21. 21.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a battery cell (c) a magnet (d) a small bottle
22. 22.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold slows yeast down (d) cold makes it pink
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the water temperature (c) size of the balloon (d) the amount of water
24. 24.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
25. 25.🔍 Which is the odd one out? (a) salt (b) vinegar (c) sunlight (d) warm water
26. 26.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) to make it sweet (d) it is food for yeast
27. 27.⚖️ 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
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) dry yeast (c) warm water (d) sugar
29. 29.⚖️ 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
30. 30.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
31. 31.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it turns to sugar (d) it grows faster
32. 32.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
33. 33.🛟 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
34. 34.True or false: warm water is needed for the yeast balloon. (a) True (b) False
35. 35.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
36. 36.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) turmeric powder (c) sugar (d) warm water
38. 38.True or false: sunlight is something yeast does not need. (a) True (b) False
39. 39.⚖️ 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) False (b) True
40. 40.🔮 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

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