Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 592 · 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 kept the same? (a) the water temperature (b) the amount of yeast (c) size of the balloon
2. 2.True or false: sugar is something yeast does not need. (a) False (b) True
3. 3.🍞 Which of these is something yeast needs? (a) time (b) sunlight (c) vinegar (d) salt
4. 4.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
5. 5.True or false: sugar is something yeast needs. (a) False (b) True
6. 6.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
7. 7.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of salt (d) a kind of stone
8. 8.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
9. 9.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) warm water (d) sunlight
10. 10.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
11. 11.⚖️ 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) False (b) True
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a mirror (d) a small bottle
13. 13.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a small bottle (c) a balloon (d) a magnet
15. 15.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) time (d) sugar
16. 16.🔮 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 bigger (d) the balloon is smaller
17. 17.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
18. 18.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
19. 19.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
20. 20.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
21. 21.⚖️ 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) False (b) True
22. 22.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
23. 23.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) salt
25. 25.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it turns to sugar (d) it grows faster
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) sugar (d) a battery cell
27. 27.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
29. 29.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) a comb (d) a balloon
30. 30.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) dry yeast (d) turmeric powder
32. 32.⚖️ 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 amount of water (c) the water temperature
33. 33.⚖️ 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 keep it the same (b) we change it (c) we measure it
34. 34.🍞 Which of these is something yeast needs? (a) sugar (b) vinegar (c) a magnet (d) salt
35. 35.🔮 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
36. 36.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) time (d) sugar
37. 37.⚖️ 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 same bottles
38. 38.⚖️ 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) True (b) False
39. 39.🔍 Which is the odd one out? (a) time (b) warm water (c) vinegar (d) sugar
40. 40.True or false: a comb is not needed for the yeast balloon. (a) True (b) False

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