Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 880 · 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.True or false: time is something yeast does not need. (a) False (b) True
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a comb (c) dry yeast (d) sugar
3. 3.📘 What is yeast? (a) a kind of salt (b) a tiny living fungus (c) a kind of sugar (d) a kind of stone
4. 4.🔮 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
5. 5.True or false: vinegar is something yeast does not need. (a) False (b) True
6. 6.⚖️ 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 measure it (c) we keep it the same
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a battery cell (c) sugar (d) warm water
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) sugar (c) a small bottle (d) warm water
9. 9.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
10. 10.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
11. 11.🍞 Which of these is something yeast needs? (a) sugar (b) vinegar (c) salt (d) sunlight
12. 12.⚖️ 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
13. 13.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
15. 15.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
16. 16.True or false: sunlight is something yeast does not need. (a) True (b) False
17. 17.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a balloon (c) turmeric powder (d) a magnet
18. 18.True or false: sugar is something yeast needs. (a) False (b) True
19. 19.True or false: a magnet is something yeast does not need. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) vinegar (d) salt
21. 21.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) throw it at a wall (d) keep it for a month
22. 22.⚖️ 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 keep it the same (c) we measure it
23. 23.⚖️ 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 water temperature (b) the amount of sugar (c) size of the balloon (d) the amount of yeast
24. 24.⚖️ 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 change it (c) we measure it
25. 25.🔍 Which is the odd one out? (a) warm water (b) time (c) salt (d) sugar
26. 26.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
27. 27.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) dry yeast (c) a mirror (d) a comb
29. 29.⚖️ 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 water temperature (c) the same bottles
30. 30.⚖️ 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 sugar (b) size of the balloon (c) the amount of yeast (d) the amount of water
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a paper clip (c) sugar (d) a small bottle
32. 32.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
33. 33.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a paper clip (d) dry yeast
35. 35.⚖️ 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) False (b) True
36. 36.True or false: time is something yeast needs. (a) True (b) False
37. 37.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.⚖️ 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 keep it the same (b) we change it (c) we measure it
39. 39.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
40. 40.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) a magnet (d) sunlight

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