Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 140 · 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.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to clean floors (d) to colour rice
2. 2.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
3. 3.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) salt (d) time
4. 4.⚖️ 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 sugar (c) the water temperature
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
6. 6.🔮 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
7. 7.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) vinegar (d) time
8. 8.⚖️ 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 measure it (c) we keep it the same
9. 9.⚖️ 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 water (b) the water temperature (c) the amount of yeast (d) size of the balloon
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the water temperature”? (a) we keep it the same (b) we measure it (c) we change it
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 water (b) the amount of sugar (c) size of the balloon (d) the water temperature
12. 12.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
14. 14.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.🔍 Which is the odd one out? (a) salt (b) sugar (c) time (d) warm water
16. 16.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) salt (d) sunlight
17. 17.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) put it in your mouth (d) pour it down the sink
18. 18.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) sugar (d) time
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a balloon (c) sugar (d) a small bottle
20. 20.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) sugar (c) a mirror (d) a paper clip
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a comb (d) dry yeast
22. 22.True or false: warm water is needed for the yeast balloon. (a) False (b) True
23. 23.🍞 Which of these is something yeast does not need? (a) a magnet (b) time (c) sugar (d) warm water
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) a magnet (d) a balloon
25. 25.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
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) size of the balloon (b) the same bottles (c) the water temperature
28. 28.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it bursts at once (d) it grows very little
29. 29.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) time (d) salt
30. 30.⚖️ 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
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a battery cell (c) a small bottle (d) a balloon
32. 32.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
33. 33.🔍 Which is the odd one out? (a) salt (b) vinegar (c) sunlight (d) sugar
34. 34.⚖️ 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 keep it the same (c) we change it
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) True (b) False
36. 36.True or false: sunlight is something yeast does not need. (a) False (b) True
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.⚖️ 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) True (b) False
39. 39.True or false: warm water is something yeast does not need. (a) False (b) True
40. 40.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) smoke (d) steam

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