Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 911 · 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) sugar (b) time (c) salt (d) warm water
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) False (b) True
3. 3.⚖️ 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 sugar (b) the water temperature (c) the amount of yeast (d) size of the balloon
4. 4.True or false: warm water is something yeast does not need. (a) True (b) False
5. 5.⚖️ 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 measure 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 yeast”? (a) we change it (b) we keep it the same (c) we measure it
7. 7.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
8. 8.⚖️ 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
9. 9.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it glows (d) it turns to sugar
10. 10.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it grows much faster (d) it turns yellow
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) put it in your mouth (d) pour it down the sink
12. 12.⚖️ 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
13. 13.⚖️ 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 amount of yeast (c) the same bottles (d) the water temperature
14. 14.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
15. 15.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of salt (d) a kind of sugar
16. 16.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a battery cell (d) warm water
18. 18.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
19. 19.⚖️ 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) True (b) False
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) dry yeast (d) a battery cell
21. 21.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to wash dishes (d) to clean floors
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) dry yeast (c) a balloon (d) warm water
23. 23.🔮 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 smaller (d) the balloon is bigger
24. 24.🔍 Which is the odd one out? (a) salt (b) time (c) warm water (d) sugar
25. 25.True or false: sunlight is something yeast needs. (a) False (b) True
26. 26.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) sugar (c) a magnet (d) a comb
27. 27.True or false: sunlight is something yeast does not need. (a) False (b) True
28. 28.True or false: warm water is something yeast needs. (a) False (b) True
29. 29.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) smoke (d) steam
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) sugar (d) turmeric powder
31. 31.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) warm water (d) a balloon
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) sugar (c) dry yeast (d) a balloon
34. 34.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) vinegar (d) a magnet
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) True (b) False
36. 36.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
37. 37.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a comb (c) dry yeast (d) sugar
39. 39.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
40. 40.True or false: sugar is something yeast does not need. (a) False (b) True

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