Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 139 · 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 needs? (a) sunlight (b) a magnet (c) time (d) salt
2. 2.True or false: a magnet is something yeast does not need. (a) False (b) True
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) put it in your mouth (d) throw it at a wall
4. 4.⚖️ 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 sugar
5. 5.📘 What is yeast? (a) a kind of salt (b) a tiny living fungus (c) a kind of stone (d) a kind of sugar
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) dry yeast (c) a balloon (d) a small bottle
7. 7.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.⚖️ 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 amount of yeast (c) the water temperature
9. 9.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
10. 10.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas
11. 11.⚖️ 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 change it (b) we measure it (c) we keep it the same
12. 12.⚖️ 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
13. 13.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) boiling hot (d) very salty
14. 14.True or false: sugar is something yeast does not need. (a) True (b) False
15. 15.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it turns to sugar (d) it glows
16. 16.True or false: a magnet is something yeast needs. (a) True (b) False
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) sugar (c) a small bottle (d) warm water
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) sugar (c) dry yeast (d) a small bottle
19. 19.🔮 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
20. 20.True or false: a comb is needed for the yeast balloon. (a) True (b) False
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) True (b) False
22. 22.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
23. 23.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
24. 24.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
25. 25.⚖️ 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 water temperature (c) the amount of sugar (d) size of the balloon
26. 26.🍞 Which of these is something yeast does not need? (a) vinegar (b) warm water (c) time (d) sugar
27. 27.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
28. 28.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
29. 29.⚖️ 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 change it (c) we keep it the same
30. 30.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
31. 31.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) turmeric powder (c) a paper clip (d) sugar
32. 32.True or false: sugar is something yeast needs. (a) True (b) False
33. 33.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) it shrinks to nothing (d) the balloon is smaller
34. 34.⚖️ 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
35. 35.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold water is heavy (c) cold kills sugar (d) cold makes it pink
36. 36.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) False (b) True
38. 38.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
39. 39.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) sugar (d) vinegar
40. 40.🍞 Which of these is something yeast does not need? (a) salt (b) time (c) sugar (d) warm water

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