Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 4 · 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.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) a mirror (d) a balloon
2. 2.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) salt (d) time
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) a mirror (d) warm water
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) warm water (d) a comb
5. 5.🔍 Which is the odd one out? (a) salt (b) sunlight (c) a magnet (d) time
6. 6.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a mirror (c) a magnet (d) dry yeast
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) a magnet (d) a balloon
8. 8.🔍 Which is the odd one out? (a) sunlight (b) salt (c) vinegar (d) sugar
9. 9.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
10. 10.⚖️ 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
11. 11.⚖️ 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) the amount of sugar (d) size of the balloon
12. 12.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
13. 13.⚖️ 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
14. 14.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) warm water (d) sunlight
15. 15.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a comb (c) a magnet (d) turmeric powder
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) the water temperature (c) size of the balloon
17. 17.⚖️ 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 yeast (b) size of the balloon (c) the amount of sugar (d) the water temperature
18. 18.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
19. 19.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) salt (d) time
20. 20.True or false: salt is something yeast needs. (a) False (b) True
21. 21.⚖️ 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) False (b) True
22. 22.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
23. 23.🔮 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
24. 24.True or false: a magnet is something yeast needs. (a) True (b) False
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) turmeric powder (d) sugar
26. 26.⚖️ 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 change it (b) we measure it (c) we keep it the same
27. 27.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) sunlight
28. 28.🍞 Which of these is something yeast does not need? (a) a magnet (b) time (c) sugar (d) warm water
29. 29.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
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) size of the balloon (b) the water temperature (c) the amount of water
31. 31.⚖️ 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 yeast
32. 32.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
33. 33.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
35. 35.⚖️ 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 change it (b) we measure it (c) we keep it the same
36. 36.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a kind of sugar (d) a tiny living fungus
37. 37.⚖️ 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
38. 38.🔮 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
39. 39.🔮 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
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 change it (c) we measure it

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