Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 465 · 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 battery cell (b) a small bottle (c) a balloon (d) dry yeast
2. 2.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.⚖️ 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 change it (b) we keep it the same (c) we measure it
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a mirror (d) sugar
5. 5.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
6. 6.⚖️ 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 same bottles (c) the amount of water (d) the water temperature
7. 7.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
8. 8.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) sugar (d) a battery cell
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) True (b) False
10. 10.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
11. 11.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
12. 12.⚖️ 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 amount of water (d) the water temperature
13. 13.⚖️ 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 keep it the same (c) we change it
14. 14.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a balloon (c) a magnet (d) a comb
16. 16.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
17. 17.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
18. 18.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
19. 19.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
20. 20.⚖️ 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 change it (c) we measure it
21. 21.🔍 Which is the odd one out? (a) warm water (b) sunlight (c) sugar (d) time
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) turmeric powder (d) warm water
23. 23.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
24. 24.📘 What is yeast? (a) a tiny living fungus (b) a kind of salt (c) a kind of stone (d) a kind of sugar
25. 25.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold slows yeast down (c) cold makes it pink (d) cold kills sugar
26. 26.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
27. 27.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) it shrinks to nothing (d) the balloon is smaller
28. 28.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) dry yeast (c) a small bottle (d) sugar
30. 30.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
31. 31.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
32. 32.True or false: salt is something yeast needs. (a) False (b) True
33. 33.True or false: vinegar is something yeast needs. (a) True (b) False
34. 34.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) a comb (d) warm water
36. 36.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows very little (d) it grows much faster
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a mirror (c) a small bottle (d) warm water
38. 38.🔍 Which is the odd one out? (a) a magnet (b) sugar (c) time (d) warm water
39. 39.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) salt
40. 40.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) steam (d) carbon dioxide gas

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