Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 829 · 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.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas
2. 2.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) turmeric powder (d) dry yeast
5. 5.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
6. 6.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
7. 7.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) keep it for a month (d) put it in your mouth
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) False (b) True
9. 9.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold slows yeast down (c) cold kills sugar (d) cold makes it pink
10. 10.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
11. 11.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it grows very little (d) it bursts at once
12. 12.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) sugar (d) warm water
14. 14.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to clean floors (d) to wash dishes
15. 15.True or false: sunlight is something yeast needs. (a) True (b) False
16. 16.⚖️ 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 measure it (b) we change it (c) we keep it the same
17. 17.⚖️ 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
18. 18.⚖️ 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) the same bottles
19. 19.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
20. 20.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
21. 21.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) a magnet
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a mirror (d) warm water
23. 23.🍞 Which of these is something yeast does not need? (a) time (b) vinegar (c) warm water (d) sugar
24. 24.True or false: sugar is something yeast needs. (a) True (b) False
25. 25.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
26. 26.⚖️ 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
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) sugar (d) a balloon
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a magnet (c) sugar (d) warm water
29. 29.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) time (d) sunlight
30. 30.🍞 Which of these is something yeast needs? (a) sunlight (b) sugar (c) vinegar (d) salt
31. 31.⚖️ 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
32. 32.True or false: time is something yeast does not need. (a) False (b) True
33. 33.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) size of the balloon (c) the amount of yeast
35. 35.⚖️ 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
36. 36.True or false: warm water is needed for the yeast balloon. (a) False (b) True
37. 37.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
38. 38.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
39. 39.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a magnet (c) turmeric powder (d) a mirror
40. 40.True or false: salt is something yeast does not need. (a) True (b) False

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