Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 615 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a comb (c) warm water (d) sugar
2. 2.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it bursts at once (d) it turns yellow
3. 3.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) throw it at a wall (d) put it in your mouth
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) sugar (d) a paper clip
5. 5.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
6. 6.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the same bottles (c) the water temperature (d) the amount of sugar
7. 7.⚖️ 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
8. 8.True or false: a magnet is something yeast needs. (a) True (b) False
9. 9.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a magnet (d) dry yeast
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “size of the balloon”? (a) we change it (b) we keep it the same (c) we measure it
12. 12.⚖️ 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
13. 13.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) warm water (d) a battery cell
14. 14.🔍 Which is the odd one out? (a) time (b) sugar (c) sunlight (d) warm water
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 sugar”? (a) we keep it the same (b) we change it (c) we measure it
16. 16.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
17. 17.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
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) the water temperature (b) size of the balloon (c) the amount of yeast
19. 19.True or false: sugar is something yeast needs. (a) False (b) True
20. 20.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) sugar (d) salt
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) a battery cell (d) dry yeast
22. 22.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) sugar (c) a mirror (d) a battery cell
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a magnet (c) a small bottle (d) sugar
24. 24.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) salt (b) time (c) warm water (d) sugar
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 sugar (b) size of the balloon (c) the water temperature
28. 28.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
29. 29.🍞 Which of these is something yeast needs? (a) sunlight (b) warm water (c) salt (d) a magnet
30. 30.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
31. 31.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) sunlight (d) time
32. 32.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
34. 34.⚖️ 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) True (b) False
35. 35.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) the balloon is smaller (d) it turns to bread
36. 36.⚖️ 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) size of the balloon (b) the water temperature (c) the amount of yeast (d) the amount of water
37. 37.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to wash dishes (d) to colour rice
38. 38.⚖️ 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
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a battery cell (d) a small bottle
40. 40.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True

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