Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 713 · 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 is the odd one out? (a) vinegar (b) sunlight (c) a magnet (d) time
2. 2.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a magnet (c) a mirror (d) a paper clip
4. 4.⚖️ 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 measure it (b) we change it (c) we keep it the same
5. 5.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
6. 6.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
7. 7.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) very salty (d) boiling hot
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 keep it the same (c) we measure it
9. 9.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) sugar (c) dry yeast (d) warm water
11. 11.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
12. 12.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
13. 13.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) turmeric powder (d) a small bottle
14. 14.⚖️ 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 measure it (b) we keep it the same (c) we change it
15. 15.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) to colour it (d) it is food for yeast
16. 16.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) time (d) sugar
17. 17.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
18. 18.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) salt (d) sugar
19. 19.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
20. 20.True or false: warm water is something yeast needs. (a) False (b) True
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a small bottle (d) a paper clip
22. 22.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) the balloon is bigger (d) it shrinks to nothing
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) size of the balloon (c) the amount of water (d) the amount of yeast
24. 24.⚖️ 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) size of the balloon (c) the water temperature
25. 25.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) time (d) vinegar
26. 26.⚖️ 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
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a small bottle (c) dry yeast (d) sugar
28. 28.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a comb (c) a battery cell (d) a magnet
29. 29.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold kills sugar (d) cold water is heavy
30. 30.⚖️ 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 same bottles (b) the amount of water (c) the amount of yeast (d) the water temperature
31. 31.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) put it in your mouth (d) throw it at a wall
32. 32.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
33. 33.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) a small bottle (c) warm water (d) dry yeast
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) turmeric powder (c) dry yeast (d) warm water
36. 36.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
37. 37.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster
38. 38.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
39. 39.True or false: sunlight is something yeast needs. (a) False (b) True
40. 40.True or false: salt is something yeast needs. (a) True (b) False

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