Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 311 · 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.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) keep it for a month (d) throw it at a wall
2. 2.⚖️ 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
3. 3.⚖️ 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
4. 4.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) time (b) sunlight (c) warm water (d) sugar
6. 6.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
7. 7.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a magnet (c) sugar (d) dry yeast
9. 9.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) warm water (d) salt
10. 10.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) warm water (d) a battery cell
12. 12.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) time (d) salt
14. 14.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
15. 15.⚖️ 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) False (b) True
16. 16.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) time (d) sugar
17. 17.⚖️ 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
18. 18.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) it turns to sugar (d) the yeast is killed
19. 19.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a kind of stone (d) a tiny living fungus
20. 20.⚖️ 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
21. 21.⚖️ 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
22. 22.True or false: sugar is something yeast needs. (a) True (b) False
23. 23.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
24. 24.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
25. 25.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) salt (d) sugar
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
27. 27.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
28. 28.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a magnet (c) a battery cell (d) a paper clip
29. 29.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a mirror (c) a magnet (d) a comb
30. 30.⚖️ 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) size of the balloon (b) the water temperature (c) the amount of sugar (d) the amount of water
31. 31.True or false: sugar is something yeast does not need. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) a magnet (d) sugar
33. 33.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
34. 34.True or false: vinegar is something yeast needs. (a) False (b) True
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a battery cell (d) dry yeast
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) warm water (d) turmeric powder
37. 37.🍞 Which of these is something yeast needs? (a) warm water (b) sunlight (c) vinegar (d) a magnet
38. 38.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
39. 39.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of yeast (b) the water temperature (c) size of the balloon (d) the amount of water

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