Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 745 · 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.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) carbon dioxide gas (d) steam
2. 2.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a magnet (c) dry yeast (d) a balloon
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) size of the balloon (b) the water temperature (c) the amount of yeast
5. 5.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
6. 6.⚖️ 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) the same bottles (c) the amount of sugar (d) the amount of yeast
7. 7.True or false: a magnet is something yeast needs. (a) False (b) True
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) warm water (d) time
10. 10.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
11. 11.True or false: warm water is something yeast does not need. (a) True (b) False
12. 12.⚖️ 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 same bottles (c) the water temperature
13. 13.⚖️ 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
14. 14.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it grows much faster (d) it bursts at once
15. 15.🧺 Do we need a paper clip 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? Which of these is kept the same? (a) size of the balloon (b) the amount of water (c) the water temperature
17. 17.🔍 Which is the odd one out? (a) a magnet (b) salt (c) warm water (d) vinegar
18. 18.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
19. 19.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
20. 20.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
21. 21.🍞 Which of these is something yeast needs? (a) warm water (b) sunlight (c) salt (d) a magnet
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a paper clip (d) a small bottle
23. 23.True or false: vinegar is something yeast needs. (a) False (b) True
24. 24.🔮 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
25. 25.⚖️ 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 change it (c) we keep it the same
26. 26.🛟 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
27. 27.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) sugar (d) sunlight
28. 28.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a mirror (c) dry yeast (d) warm water
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) a magnet (d) dry yeast
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) False (b) True
31. 31.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
32. 32.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) a paper clip (d) a balloon
33. 33.True or false: sugar is something yeast does not need. (a) True (b) False
34. 34.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
35. 35.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
36. 36.True or false: sugar is needed for the yeast balloon. (a) True (b) False
37. 37.True or false: time is something yeast does not need. (a) True (b) False
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) True (b) False
39. 39.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) salt
40. 40.🔍 Which is the odd one out? (a) warm water (b) sugar (c) salt (d) time

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