Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 541 · 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 of these is something yeast does not need? (a) time (b) vinegar (c) warm water (d) sugar
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a comb (c) warm water (d) dry yeast
3. 3.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) smoke (d) air from outside
4. 4.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
5. 5.⚖️ 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
6. 6.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we change it (b) we keep it the same (c) we measure it
7. 7.⚖️ 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
8. 8.True or false: warm water is something yeast does not need. (a) True (b) False
9. 9.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of stone (d) a kind of salt
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) turmeric powder (d) a balloon
11. 11.True or false: sugar is something yeast needs. (a) True (b) False
12. 12.⚖️ 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 sugar
13. 13.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
14. 14.True or false: sugar is needed for the yeast balloon. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) salt (b) warm water (c) a magnet (d) vinegar
16. 16.🍞 Which of these is something yeast needs? (a) vinegar (b) warm water (c) sunlight (d) a magnet
17. 17.⚖️ 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 measure it (b) we keep it the same (c) we change it
18. 18.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) a small bottle (c) warm water (d) dry yeast
19. 19.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
20. 20.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) dry yeast (d) a mirror
22. 22.🔮 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
23. 23.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) sunlight (d) time
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a magnet (c) warm water (d) dry yeast
25. 25.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
26. 26.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold kills sugar (d) cold slows yeast down
27. 27.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
28. 28.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
29. 29.True or false: time is something yeast needs. (a) True (b) False
30. 30.True or false: vinegar is something yeast needs. (a) True (b) False
31. 31.True or false: a magnet is something yeast needs. (a) False (b) True
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) False (b) True
33. 33.🔮 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
34. 34.🍞 Does yeast need vinegar 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) a small bottle (b) warm water (c) a battery cell (d) a balloon
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a battery cell (d) dry yeast
37. 37.⚖️ 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) False (b) True
38. 38.⚖️ 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
39. 39.🔍 Which is the odd one out? (a) time (b) sugar (c) vinegar (d) warm water
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True

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