Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 158 · 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? What do we do with “the water temperature”? (a) we measure it (b) we change it (c) we keep it the same
2. 2.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
3. 3.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a paper clip (d) dry yeast
5. 5.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) pour it down the sink (d) put it in your mouth
6. 6.True or false: time is something yeast does not need. (a) True (b) False
7. 7.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) ice cold (d) very salty
8. 8.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
9. 9.🍞 Which of these is something yeast does not need? (a) sunlight (b) warm water (c) sugar (d) time
10. 10.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
11. 11.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
12. 12.True or false: vinegar is something yeast needs. (a) True (b) False
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we keep it the same (b) we measure it (c) we change it
14. 14.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of salt (d) a kind of stone
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a battery cell (c) a comb (d) a mirror
16. 16.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) a magnet
17. 17.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it bursts at once (d) it grows much faster
18. 18.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
19. 19.🍞 Which of these is something yeast needs? (a) warm water (b) a magnet (c) vinegar (d) salt
20. 20.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
21. 21.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) sugar (d) vinegar
22. 22.⚖️ 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
23. 23.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a small bottle (d) a battery cell
26. 26.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.🍞 Which of these is something yeast does not need? (a) salt (b) sugar (c) time (d) warm water
28. 28.🍞 Which of these is something yeast does not need? (a) vinegar (b) warm water (c) time (d) sugar
29. 29.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
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 the one thing we change. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) a magnet (b) salt (c) warm water (d) vinegar
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) dry yeast (c) a balloon (d) a small bottle
33. 33.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
34. 34.True or false: a magnet is something yeast needs. (a) False (b) True
35. 35.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.⚖️ 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 change it (c) we keep it the same
37. 37.⚖️ 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
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) sugar (d) a magnet
39. 39.🍞 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
40. 40.True or false: a mirror is needed for the yeast balloon. (a) True (b) False

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