Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 772 · 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? True or false: size of the balloon is what we measure. (a) True (b) False
2. 2.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) put it in your mouth (d) keep it for a month
3. 3.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) warm water (d) time
4. 4.⚖️ 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 measure it (b) we change it (c) we keep it the same
5. 5.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
6. 6.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
7. 7.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
8. 8.⚖️ 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 keep it the same (b) we measure it (c) we change it
9. 9.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
11. 11.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
12. 12.⚖️ 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 water (b) size of the balloon (c) the amount of yeast (d) the water temperature
13. 13.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
14. 14.🔍 Which is the odd one out? (a) vinegar (b) time (c) sunlight (d) salt
15. 15.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) air from outside (d) steam
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a magnet (c) sugar (d) a small bottle
18. 18.True or false: sunlight is something yeast needs. (a) True (b) False
19. 19.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
20. 20.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
21. 21.True or false: vinegar is something yeast does not need. (a) False (b) True
22. 22.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows much faster (d) it grows very little
23. 23.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) a magnet (d) salt
24. 24.True or false: sugar is something yeast does not need. (a) False (b) True
25. 25.True or false: warm water is something yeast needs. (a) False (b) True
26. 26.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) the yeast is killed (d) it grows faster
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) size of the balloon (c) the water temperature
28. 28.🍞 Which of these is something yeast does not need? (a) time (b) a magnet (c) sugar (d) warm water
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a battery cell (c) sugar (d) dry yeast
30. 30.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
31. 31.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) salt (d) warm water
32. 32.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold water is heavy (d) cold slows yeast down
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a comb (d) a small bottle
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.⚖️ 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 sugar
36. 36.⚖️ 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 change it (b) we measure it (c) we keep it the same
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a battery cell (d) a balloon
38. 38.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
39. 39.True or false: time is something yeast needs. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) vinegar (d) salt

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