Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 209 · 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.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) to make it heavy (d) it is food for yeast
2. 2.⚖️ 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
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) a small bottle (c) dry yeast (d) a balloon
4. 4.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a magnet (c) a paper clip (d) dry yeast
6. 6.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
7. 7.True or false: time is something yeast does not need. (a) True (b) False
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) sugar (d) a balloon
9. 9.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows much faster (d) it grows very little
11. 11.⚖️ 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
12. 12.⚖️ 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 measure it (b) we keep it the same (c) we change it
13. 13.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
14. 14.🍞 Which of these is something yeast needs? (a) time (b) salt (c) vinegar (d) a magnet
15. 15.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
16. 16.🍞 Which of these is something yeast needs? (a) vinegar (b) warm water (c) salt (d) a magnet
17. 17.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a battery cell (d) a small bottle
19. 19.🍞 Which of these is something yeast needs? (a) sugar (b) a magnet (c) vinegar (d) salt
20. 20.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
21. 21.🔮 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
22. 22.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
23. 23.True or false: sunlight is something yeast needs. (a) True (b) False
24. 24.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of yeast (b) the amount of sugar (c) the water temperature (d) size of the balloon
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) warm water (c) a balloon (d) sugar
27. 27.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
28. 28.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) throw it at a wall (d) keep it for a month
29. 29.⚖️ 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
30. 30.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
31. 31.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
32. 32.True or false: salt is something yeast needs. (a) False (b) True
33. 33.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
34. 34.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
35. 35.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) sunlight
36. 36.⚖️ 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 sugar (b) the water temperature (c) size of the balloon
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a small bottle (c) sugar (d) a comb
38. 38.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) warm water (c) sugar (d) a small bottle
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) a balloon (c) sugar (d) warm water

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