Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 129 · 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 kept the same? (a) the water temperature (b) the amount of water (c) size of the balloon
2. 2.🛟 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
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of sugar”? (a) we measure it (b) we change it (c) we keep it the same
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) dry yeast (c) sugar (d) a balloon
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a paper clip (c) sugar (d) a small bottle
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a magnet (d) a small bottle
7. 7.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
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.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
10. 10.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
11. 11.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold kills sugar (d) cold water is heavy
12. 12.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) ice cold (d) very salty
13. 13.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
14. 14.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) smoke (d) steam
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 the one thing we change. (a) True (b) False
16. 16.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a battery cell (c) a magnet (d) warm water
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a balloon (d) a comb
18. 18.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
19. 19.True or false: a comb is needed for the yeast balloon. (a) False (b) True
20. 20.🍞 Which of these is something yeast needs? (a) sugar (b) vinegar (c) salt (d) sunlight
21. 21.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) vinegar (d) warm water
22. 22.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
23. 23.⚖️ 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
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) a balloon (c) sugar (d) dry yeast
25. 25.🔍 Which is the odd one out? (a) time (b) sugar (c) sunlight (d) warm water
26. 26.⚖️ 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) True (b) False
27. 27.⚖️ 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
28. 28.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “size of the balloon”? (a) we change it (b) we measure it (c) we keep it the same
30. 30.⚖️ 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 amount of sugar (c) the water temperature (d) the amount of water
31. 31.🔍 Which is the odd one out? (a) time (b) vinegar (c) sunlight (d) salt
32. 32.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
33. 33.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to make bread rise (d) to wash dishes
34. 34.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) a magnet (d) a battery cell
35. 35.🍞 Which of these is something yeast does not need? (a) sugar (b) sunlight (c) warm water (d) time
36. 36.True or false: warm water is something yeast does not need. (a) True (b) False
37. 37.True or false: vinegar is something yeast needs. (a) True (b) False
38. 38.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) it shrinks to nothing (d) the balloon is smaller
39. 39.⚖️ 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
40. 40.⚖️ 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

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