Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 598 · 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) warm water (b) vinegar (c) sunlight (d) salt
2. 2.⚖️ 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) the same bottles (c) size of the balloon (d) the water temperature
3. 3.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a comb (c) a small bottle (d) a balloon
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 “the amount of sugar”? (a) we measure it (b) we keep it the same (c) we change it
7. 7.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
8. 8.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) salt (d) warm water
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) turmeric powder (c) a mirror (d) a small bottle
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a comb (c) a magnet (d) a mirror
11. 11.True or false: sugar is something yeast does not need. (a) False (b) True
12. 12.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of salt (d) a kind of sugar
13. 13.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
14. 14.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) sunlight
15. 15.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
16. 16.⚖️ 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
17. 17.⚖️ 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 change it (b) we keep it the same (c) we measure it
18. 18.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
19. 19.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a mirror (d) a small bottle
21. 21.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
22. 22.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster
23. 23.🍞 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
24. 24.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) it shrinks to nothing (d) the balloon is bigger
25. 25.🔍 Which is the odd one out? (a) time (b) warm water (c) salt (d) sugar
26. 26.True or false: a comb is needed for the yeast balloon. (a) False (b) True
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the water temperature (c) the amount of yeast (d) the amount of water
28. 28.True or false: a magnet is something yeast needs. (a) True (b) False
29. 29.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) warm water (c) dry yeast (d) sugar
31. 31.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
32. 32.⚖️ 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
33. 33.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
34. 34.🔮 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
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) True (b) False
36. 36.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a comb (c) turmeric powder (d) a mirror
37. 37.⚖️ 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
38. 38.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) smoke (d) steam
39. 39.⚖️ 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) True (b) False
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) sugar (d) a paper clip

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