Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 327 · 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) turmeric powder (b) sugar (c) dry yeast (d) a balloon
2. 2.⚖️ 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 keep it the same (c) we change it
3. 3.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) keep it for a month (d) throw it at a wall
4. 4.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
5. 5.True or false: a comb is needed for the yeast balloon. (a) False (b) True
6. 6.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) warm water (d) time
7. 7.⚖️ 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
8. 8.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) sugar (d) a paper clip
10. 10.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) it grows faster (d) the yeast is killed
11. 11.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a balloon (c) turmeric powder (d) a battery cell
13. 13.True or false: a magnet is something yeast does not need. (a) True (b) False
14. 14.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a battery cell (c) sugar (d) dry yeast
16. 16.True or false: vinegar is something yeast needs. (a) True (b) False
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) a comb (d) sugar
18. 18.⚖️ 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
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) warm water (c) sugar (d) a small bottle
20. 20.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) a comb (d) sugar
22. 22.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
23. 23.🍞 Which of these is something yeast does not need? (a) a magnet (b) sugar (c) time (d) warm water
24. 24.🔍 Which is the odd one out? (a) a magnet (b) salt (c) sugar (d) sunlight
25. 25.🔍 Which is the odd one out? (a) vinegar (b) time (c) salt (d) sunlight
26. 26.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) sunlight (d) warm water
27. 27.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
28. 28.True or false: sugar is something yeast needs. (a) True (b) False
29. 29.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
30. 30.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) steam (d) air from outside
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a magnet (c) dry yeast (d) a balloon
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) a paper clip (d) a balloon
33. 33.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
34. 34.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
35. 35.⚖️ 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) the same bottles (c) the amount of yeast (d) size of the balloon
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) True (b) False
37. 37.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
38. 38.⚖️ 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 water
39. 39.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True

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