Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 142 · 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 the one thing we change? (a) the amount of sugar (b) the amount of water (c) the water temperature (d) the same bottles
2. 2.⚖️ 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 measure it (b) we change it (c) we keep it the same
3. 3.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) a magnet (d) sugar
4. 4.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
5. 5.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
6. 6.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
7. 7.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold water is heavy (d) cold kills sugar
8. 8.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) a magnet (d) salt
10. 10.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
11. 11.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) pour it down the sink (d) throw it at a wall
13. 13.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) turmeric powder (c) dry yeast (d) a balloon
15. 15.⚖️ 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
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a battery cell (d) a small bottle
17. 17.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
18. 18.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
19. 19.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
20. 20.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) boiling hot (d) very salty
21. 21.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) the yeast is killed (c) it glows (d) it grows faster
22. 22.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) to make it heavy (d) it is food for yeast
23. 23.True or false: warm water is needed for the yeast balloon. (a) True (b) False
24. 24.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) True (b) False
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) False (b) True
27. 27.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
28. 28.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
29. 29.⚖️ 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) True (b) False
30. 30.⚖️ 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 sugar (b) the water temperature (c) size of the balloon
31. 31.⚖️ 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
32. 32.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
35. 35.🍞 Which of these is something yeast needs? (a) vinegar (b) sugar (c) salt (d) a magnet
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a paper clip (c) a balloon (d) dry yeast
37. 37.True or false: warm water 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 same bottles is the one thing we change. (a) True (b) False
39. 39.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a comb (c) a battery cell (d) a magnet
40. 40.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed

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