Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 979 · 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.⚖️ 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 keep it the same (b) we change it (c) we measure it
2. 2.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
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 keep it the same (b) we measure it (c) we change it
4. 4.🔮 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
5. 5.🍞 Which of these is something yeast needs? (a) sugar (b) sunlight (c) a magnet (d) vinegar
6. 6.True or false: sugar is something yeast does not need. (a) True (b) False
7. 7.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a small bottle (c) a battery cell (d) a mirror
8. 8.⚖️ 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 sugar
9. 9.True or false: time is something yeast needs. (a) True (b) False
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) False (b) True
11. 11.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) smoke (c) steam (d) carbon dioxide gas
14. 14.⚖️ 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 water temperature (c) the same bottles (d) size of the balloon
15. 15.⚖️ 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
16. 16.⚖️ 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 change it (c) we keep it the same
17. 17.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
18. 18.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) warm water (d) a battery cell
20. 20.⚖️ 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) True (b) False
21. 21.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
22. 22.📘 What is yeast? (a) a tiny living fungus (b) a kind of salt (c) a kind of stone (d) a kind of sugar
23. 23.⚖️ 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 keep it the same (b) we measure it (c) we change it
24. 24.True or false: salt is something yeast needs. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) sugar (d) time
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) False (b) True
27. 27.True or false: salt is something yeast does not need. (a) False (b) True
28. 28.True or false: time is something yeast does not need. (a) False (b) True
29. 29.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
30. 30.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) vinegar (d) warm water
31. 31.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) keep it for a month (d) throw it at a wall
32. 32.True or false: warm water is something yeast does not need. (a) True (b) False
33. 33.True or false: sugar is something yeast needs. (a) True (b) False
34. 34.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
35. 35.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) salt (d) a magnet
36. 36.⚖️ 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) False (b) True
37. 37.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) warm water (d) a paper clip
39. 39.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) the yeast is killed (d) it glows
40. 40.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False

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