Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 386 · 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? Which of these is the one thing we change? (a) the same bottles (b) the water temperature (c) the amount of yeast (d) the amount of water
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a paper clip (d) a balloon
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) a balloon (d) a paper clip
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) True (b) False
5. 5.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.True or false: time is something yeast does not need. (a) True (b) False
7. 7.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
8. 8.⚖️ 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 measure it (c) we keep it the same
9. 9.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a mirror (d) a small bottle
11. 11.⚖️ 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 change it (c) we measure it
12. 12.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a comb (c) sugar (d) a mirror
14. 14.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) turmeric powder (c) warm water (d) a small bottle
16. 16.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
17. 17.True or false: warm water is something yeast does not need. (a) True (b) False
18. 18.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
19. 19.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
20. 20.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) keep it for a month (d) pour it down the sink
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) sugar (d) a magnet
22. 22.🍞 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
23. 23.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) sunlight
24. 24.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) it glows (d) the yeast is killed
25. 25.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) it is food for yeast (d) to colour it
26. 26.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
27. 27.🍞 Which of these is something yeast needs? (a) warm water (b) vinegar (c) sunlight (d) salt
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the amount of sugar (c) size of the balloon (d) the amount of water
29. 29.True or false: sunlight is something yeast does not need. (a) True (b) False
30. 30.⚖️ 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 change it (b) we measure it (c) we keep it the same
31. 31.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) dry yeast (d) turmeric powder
33. 33.True or false: sugar is something yeast needs. (a) True (b) False
34. 34.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
35. 35.True or false: vinegar is something yeast needs. (a) False (b) True
36. 36.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
37. 37.⚖️ 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) True (b) False
38. 38.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to wash dishes (d) to colour rice
39. 39.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) sugar (d) salt
40. 40.True or false: warm water is needed for the yeast balloon. (a) False (b) True

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