Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 205 · 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? Which of these is what we measure? (a) the same bottles (b) the water temperature (c) size of the balloon (d) the amount of yeast
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a battery cell (c) sugar (d) warm water
3. 3.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) time (d) warm water
4. 4.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
5. 5.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold water is heavy (d) cold slows yeast down
6. 6.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a balloon (d) a comb
8. 8.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a small bottle (d) a mirror
10. 10.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
11. 11.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
12. 12.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
13. 13.True or false: time is something yeast needs. (a) False (b) True
14. 14.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it bursts at once (d) it grows very little
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a magnet (d) a balloon
16. 16.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) sugar (d) a paper clip
17. 17.⚖️ 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
18. 18.True or false: warm water is something yeast does not need. (a) True (b) False
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) dry yeast (d) a paper clip
20. 20.⚖️ 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) False (b) True
21. 21.True or false: warm water is needed for the yeast balloon. (a) True (b) False
22. 22.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
23. 23.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
24. 24.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
25. 25.🔍 Which is the odd one out? (a) sugar (b) time (c) a magnet (d) warm water
26. 26.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) throw it at a wall (d) put it in your mouth
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) a mirror (d) dry yeast
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) turmeric powder (c) warm water (d) dry yeast
29. 29.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
30. 30.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) vinegar (d) sugar
32. 32.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) sugar (d) time
33. 33.True or false: salt is something yeast does not need. (a) True (b) False
34. 34.⚖️ 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 keep it the same (b) we change it (c) we measure it
35. 35.⚖️ 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 amount of water (c) the amount of yeast (d) size of the balloon
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.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) time (b) vinegar (c) sugar (d) warm water
39. 39.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) sunlight (d) time
40. 40.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) a magnet (d) sugar

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