Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 733 · 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: a mirror is needed for the yeast balloon. (a) True (b) False
2. 2.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
3. 3.⚖️ 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) True (b) False
4. 4.⚖️ 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
5. 5.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a magnet (c) a mirror (d) a paper clip
6. 6.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
7. 7.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) vinegar (d) warm water
8. 8.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
9. 9.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) a magnet (d) salt
11. 11.⚖️ 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 measure it (b) we keep it the same (c) we change it
12. 12.🔮 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
13. 13.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) it shrinks to nothing (d) the balloon is bigger
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) a comb (d) dry yeast
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a balloon (d) a mirror
16. 16.True or false: warm water is something yeast needs. (a) False (b) True
17. 17.True or false: sunlight is something yeast needs. (a) False (b) True
18. 18.True or false: vinegar is something yeast needs. (a) False (b) True
19. 19.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) throw it at a wall (d) pour it down the sink
20. 20.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a magnet (c) a small bottle (d) a balloon
22. 22.True or false: a magnet is something yeast needs. (a) True (b) False
23. 23.⚖️ 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 sugar (b) the water temperature (c) the amount of water (d) the same bottles
24. 24.True or false: warm water is something yeast does not need. (a) True (b) False
25. 25.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
26. 26.⚖️ 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 keep it the same (c) we change it
27. 27.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) sunlight (d) time
28. 28.🍞 Which of these is something yeast needs? (a) time (b) a magnet (c) salt (d) sunlight
29. 29.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) time (d) sugar
30. 30.⚖️ 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
31. 31.🔍 Which is the odd one out? (a) salt (b) vinegar (c) a magnet (d) sugar
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of yeast (b) the water temperature (c) size of the balloon (d) the amount of sugar
33. 33.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
34. 34.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold water is heavy (c) cold makes it pink (d) cold kills sugar
36. 36.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) it grows faster (d) the yeast is killed
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) dry yeast (c) sugar (d) a balloon
38. 38.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a tiny living fungus (d) a kind of salt
39. 39.⚖️ 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
40. 40.⚖️ 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 keep it the same (b) we measure it (c) we change it

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