Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 769 · 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 is the odd one out? (a) sunlight (b) sugar (c) warm water (d) time
2. 2.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) time (d) salt
3. 3.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) boiling hot (d) very salty
4. 4.⚖️ 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 keep it the same (b) we measure it (c) we change it
5. 5.⚖️ 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) True (b) False
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) dry yeast (d) a mirror
7. 7.⚖️ 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
8. 8.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) sugar (d) a comb
9. 9.⚖️ 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 amount of yeast (c) the water temperature (d) the same bottles
10. 10.⚖️ 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
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) turmeric powder (d) a balloon
12. 12.🔍 Which is the odd one out? (a) time (b) sugar (c) vinegar (d) warm water
13. 13.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
14. 14.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
15. 15.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
16. 16.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
17. 17.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) dry yeast (d) a small bottle
19. 19.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) salt (d) warm water
20. 20.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
21. 21.⚖️ 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
22. 22.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) pour it down the sink (d) put it in your mouth
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) a small bottle (d) turmeric powder
24. 24.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) the water temperature (c) size of the balloon
26. 26.True or false: sunlight is something yeast needs. (a) False (b) True
27. 27.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it grows faster (d) it turns to sugar
28. 28.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
30. 30.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
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) False (b) True
32. 32.True or false: a comb is needed for the yeast balloon. (a) False (b) True
33. 33.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) vinegar
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) warm water (d) a magnet
35. 35.⚖️ 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
36. 36.True or false: a magnet is something yeast does not need. (a) False (b) True
37. 37.🔍 Which is the odd one out? (a) sugar (b) time (c) a magnet (d) warm water
38. 38.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) salt (d) sugar
39. 39.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
40. 40.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed

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