Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 691 · 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: sunlight is something yeast does not need. (a) True (b) False
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) turmeric powder (c) a small bottle (d) dry yeast
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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) turmeric powder (d) a balloon
5. 5.🔮 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
6. 6.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
7. 7.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) warm water (c) a balloon (d) dry yeast
9. 9.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it grows faster (d) it turns to sugar
10. 10.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
11. 11.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) a balloon (c) warm water (d) dry yeast
13. 13.True or false: salt is something yeast does not need. (a) True (b) False
14. 14.⚖️ 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 change it (b) we keep it the same (c) we measure it
15. 15.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) vinegar
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a magnet (d) a balloon
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a small bottle (d) a battery cell
18. 18.⚖️ 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
19. 19.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
20. 20.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold slows yeast down (d) cold kills sugar
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a comb (c) a balloon (d) a mirror
22. 22.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a magnet (c) dry yeast (d) a mirror
23. 23.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
24. 24.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
25. 25.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
26. 26.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) carbon dioxide gas (d) smoke
27. 27.True or false: time is something yeast does not need. (a) True (b) False
28. 28.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) dry yeast (d) a battery cell
29. 29.🔍 Which is the odd one out? (a) vinegar (b) salt (c) sunlight (d) time
30. 30.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
31. 31.True or false: salt is something yeast needs. (a) False (b) True
32. 32.⚖️ 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) size of the balloon (c) the amount of water (d) the amount of sugar
33. 33.⚖️ 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 yeast
34. 34.⚖️ 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
35. 35.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
36. 36.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) sunlight
37. 37.True or false: vinegar is something yeast does not need. (a) True (b) False
38. 38.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
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) size of the balloon (b) the amount of yeast (c) the same bottles (d) the amount of sugar
40. 40.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed

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