Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 267 · 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 of these is something yeast does not need? (a) warm water (b) salt (c) sugar (d) time
2. 2.⚖️ 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 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) put it in your mouth (b) pour it down the sink (c) keep it for a month (d) throw it at a wall
4. 4.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
5. 5.True or false: sunlight is something yeast needs. (a) False (b) True
6. 6.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True
8. 8.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a comb (c) a small bottle (d) dry yeast
9. 9.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it turns yellow (d) it bursts at once
10. 10.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) air from outside (d) smoke
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) warm water (c) a small bottle (d) sugar
12. 12.⚖️ 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 keep it the same (b) we measure it (c) we change it
13. 13.⚖️ 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 change it (b) we keep it the same (c) we measure it
14. 14.True or false: sunlight is something yeast does not need. (a) True (b) False
15. 15.⚖️ 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) size of the balloon (c) the water temperature (d) the amount of water
16. 16.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a battery cell (c) a paper clip (d) a small bottle
17. 17.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) time (d) warm water
18. 18.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) warm water (d) a magnet
19. 19.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) vinegar
20. 20.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
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 measure it (b) we change it (c) we keep it the same
22. 22.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) a magnet (d) sunlight
23. 23.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) ice cold (d) boiling hot
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) sugar (d) a balloon
25. 25.True or false: warm water is something yeast needs. (a) False (b) True
26. 26.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) dry yeast (d) a battery cell
27. 27.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.True or false: a magnet is something yeast needs. (a) False (b) True
29. 29.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
30. 30.⚖️ 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
31. 31.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold water is heavy (c) cold makes it pink (d) cold kills sugar
32. 32.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to colour it (d) to make it sweet
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) dry yeast (c) a balloon (d) sugar
34. 34.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) vinegar (d) salt
35. 35.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a balloon (c) turmeric powder (d) a mirror
37. 37.True or false: salt is something yeast needs. (a) True (b) False
38. 38.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
39. 39.True or false: sugar is something yeast needs. (a) False (b) True
40. 40.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed

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