Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 405 · 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.⚖️ 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) False (b) True
2. 2.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) False (b) True
4. 4.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
5. 5.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
6. 6.⚖️ 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 amount of yeast
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) True (b) False
8. 8.🍞 Which of these is something yeast needs? (a) sunlight (b) sugar (c) a magnet (d) salt
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) the water temperature (c) size of the balloon
10. 10.True or false: vinegar is something yeast does not need. (a) False (b) True
11. 11.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
12. 12.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) it glows (d) the yeast is killed
14. 14.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold kills sugar (c) cold water is heavy (d) cold makes it pink
15. 15.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) dry yeast (d) a paper clip
17. 17.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) put it in your mouth (d) keep it for a month
18. 18.True or false: salt is something yeast needs. (a) True (b) False
19. 19.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
20. 20.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
21. 21.⚖️ 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
22. 22.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the amount of water (c) the same bottles (d) size of the balloon
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) a balloon (c) sugar (d) a small bottle
25. 25.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
26. 26.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a mirror (d) a small bottle
28. 28.🔍 Which is the odd one out? (a) sunlight (b) time (c) vinegar (d) a magnet
29. 29.⚖️ 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 yeast (b) the amount of water (c) the same bottles (d) the water temperature
30. 30.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
32. 32.🍞 Which of these is something yeast does not need? (a) sunlight (b) warm water (c) sugar (d) time
33. 33.True or false: warm water is needed for the yeast balloon. (a) True (b) False
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) sugar (c) a small bottle (d) dry yeast
35. 35.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a tiny living fungus (d) a kind of sugar
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) False (b) True
37. 37.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
38. 38.🔍 Which is the odd one out? (a) a magnet (b) time (c) warm water (d) sugar
39. 39.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) carbon dioxide gas (d) steam

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