Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 473 · 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 what we measure? (a) size of the balloon (b) the water temperature (c) the amount of water (d) the amount of sugar
2. 2.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
3. 3.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a battery cell (d) a balloon
5. 5.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
6. 6.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) ice cold (d) boiling hot
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) a balloon (d) a magnet
8. 8.🍞 Which of these is something yeast does not need? (a) time (b) vinegar (c) warm water (d) sugar
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) sugar (d) turmeric powder
10. 10.True or false: sugar is something yeast needs. (a) True (b) False
11. 11.True or false: time is something yeast needs. (a) True (b) False
12. 12.⚖️ 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
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) dry yeast (d) a paper clip
14. 14.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) a small bottle (d) a paper clip
16. 16.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a magnet (c) dry yeast (d) warm water
18. 18.🔍 Which is the odd one out? (a) sugar (b) warm water (c) salt (d) time
19. 19.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) sugar (c) a comb (d) a mirror
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) turmeric powder (d) dry yeast
21. 21.⚖️ 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
22. 22.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
23. 23.⚖️ 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 keep it the same (c) we measure it
24. 24.⚖️ 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
25. 25.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
26. 26.⚖️ 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 change it (b) we keep it the same (c) we measure it
27. 27.⚖️ 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 water temperature (b) the amount of yeast (c) size of the balloon (d) the same bottles
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a paper clip (c) a mirror (d) a magnet
29. 29.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) keep it for a month (d) pour it down the sink
30. 30.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) it is food for yeast (d) to colour it
31. 31.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) a magnet (d) warm water
32. 32.⚖️ 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 sugar (c) size of the balloon
33. 33.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
34. 34.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold makes it pink (d) cold water is heavy
35. 35.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
36. 36.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
37. 37.True or false: warm water is needed for the yeast balloon. (a) True (b) False
38. 38.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
39. 39.⚖️ 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
40. 40.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) the balloon is bigger (d) it turns to bread

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