Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 349 · 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.True or false: a comb is needed for the yeast balloon. (a) False (b) True
2. 2.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
3. 3.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) carbon dioxide gas (d) smoke
4. 4.True or false: sugar is something yeast does not need. (a) False (b) True
5. 5.True or false: vinegar is something yeast does not need. (a) True (b) False
6. 6.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it grows very little (d) it turns yellow
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) False (b) True
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a paper clip (d) dry yeast
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) dry yeast (c) turmeric powder (d) a battery cell
10. 10.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
11. 11.⚖️ 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
12. 12.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a balloon (c) sugar (d) warm water
14. 14.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) boiling hot (d) very salty
15. 15.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
16. 16.⚖️ 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
17. 17.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) vinegar (d) sunlight
18. 18.⚖️ 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 same bottles (c) the water temperature
19. 19.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
20. 20.⚖️ 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 water temperature (b) size of the balloon (c) the amount of sugar (d) the amount of water
21. 21.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
22. 22.🍞 Which of these is something yeast needs? (a) time (b) sunlight (c) salt (d) vinegar
23. 23.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
24. 24.True or false: salt is something yeast needs. (a) False (b) True
25. 25.⚖️ 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 keep it the same (b) we measure it (c) we change it
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 keep it the same (c) we measure it
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) a small bottle (d) a comb
28. 28.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
30. 30.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) turmeric powder (c) a small bottle (d) a comb
31. 31.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) vinegar
32. 32.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
33. 33.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) the balloon is bigger (d) it turns to bread
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the amount of sugar (c) the amount of yeast (d) size of the balloon
36. 36.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a comb (c) sugar (d) a small bottle
38. 38.⚖️ 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
39. 39.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a tiny living fungus (d) a kind of stone
40. 40.True or false: a magnet is something yeast needs. (a) False (b) True

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