Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 618 · 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.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) sugar (d) time
2. 2.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) throw it at a wall (d) put it in your mouth
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) a magnet (d) dry yeast
5. 5.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) a magnet
6. 6.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it turns to sugar (d) it glows
7. 7.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) sunlight (d) warm water
9. 9.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) a small bottle (c) a balloon (d) dry yeast
10. 10.🍞 Which of these is something yeast does not need? (a) sugar (b) a magnet (c) time (d) warm water
11. 11.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) smoke (d) air from outside
13. 13.True or false: warm water is needed for the yeast balloon. (a) False (b) True
14. 14.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a mirror (c) sugar (d) a paper clip
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a balloon (d) a comb
16. 16.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
17. 17.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
18. 18.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
19. 19.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it bursts at once (d) it grows very little
20. 20.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) sunlight (d) warm water
21. 21.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) sugar (d) time
22. 22.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a battery cell (d) sugar
24. 24.🔍 Which is the odd one out? (a) warm water (b) sugar (c) salt (d) time
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) True (b) False
26. 26.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
27. 27.⚖️ 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 measure it (b) we keep it the same (c) we change it
28. 28.🔍 Which is the odd one out? (a) salt (b) sunlight (c) vinegar (d) sugar
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) dry yeast (c) warm water (d) a small bottle
30. 30.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
31. 31.⚖️ 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 water (b) the amount of sugar (c) the water temperature (d) the same bottles
32. 32.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
33. 33.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
34. 34.True or false: dry yeast is not 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a magnet (c) sugar (d) a balloon
37. 37.True or false: a small bottle is 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? What do we do with “the amount of yeast”? (a) we measure it (b) we change it (c) we keep it the same
39. 39.⚖️ 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) size of the balloon (c) the same bottles (d) the water temperature
40. 40.True or false: sunlight is something yeast needs. (a) False (b) True

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