Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 84 · 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.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it turns yellow (d) it grows much faster
2. 2.⚖️ 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
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a balloon (d) a magnet
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a small bottle (c) turmeric powder (d) a paper clip
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a comb (c) a small bottle (d) sugar
6. 6.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to colour rice (c) to clean floors (d) to make bread rise
7. 7.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold water is heavy (c) cold makes it pink (d) cold kills sugar
8. 8.⚖️ 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
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) turmeric powder (c) warm water (d) dry yeast
10. 10.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
11. 11.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sunlight (d) sugar
12. 12.⚖️ 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
13. 13.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) a magnet (d) warm water
14. 14.🛟 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
15. 15.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
16. 16.True or false: salt is something yeast needs. (a) False (b) True
17. 17.True or false: time is something yeast does not need. (a) False (b) True
18. 18.⚖️ 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 keep it the same (b) we measure it (c) we change it
19. 19.True or false: a magnet is something yeast does not need. (a) True (b) False
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) False (b) True
21. 21.🍞 Which of these is something yeast needs? (a) vinegar (b) time (c) sunlight (d) a magnet
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
23. 23.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a paper clip (d) a balloon
26. 26.🔍 Which is the odd one out? (a) salt (b) warm water (c) sugar (d) time
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) True (b) False
28. 28.⚖️ 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
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a mirror (c) a small bottle (d) a balloon
30. 30.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
31. 31.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a comb (c) a paper clip (d) a battery cell
32. 32.⚖️ 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) size of the balloon (c) the water temperature (d) the amount of yeast
33. 33.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
34. 34.🔮 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
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a comb (c) dry yeast (d) sugar
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) the amount of yeast (b) the water temperature (c) size of the balloon (d) the amount of sugar
37. 37.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) salt (d) time
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 what we measure. (a) False (b) True
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) a paper clip (d) sugar
40. 40.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) sugar (d) a magnet

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