Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 445 · 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) warm water (c) sugar (d) time
2. 2.⚖️ 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
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 yeast”? (a) we keep it the same (b) we measure it (c) we change it
4. 4.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold slows yeast down (c) cold makes it pink (d) cold kills sugar
5. 5.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) turmeric powder (c) a mirror (d) a battery cell
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) dry yeast (d) turmeric powder
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a balloon (c) dry yeast (d) warm water
8. 8.⚖️ 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
9. 9.True or false: vinegar is something yeast needs. (a) True (b) False
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the water temperature (c) the amount of yeast
11. 11.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it turns to sugar (d) it glows
12. 12.🍞 Which of these is something yeast needs? (a) salt (b) warm water (c) a magnet (d) sunlight
13. 13.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) salt (d) sugar
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a comb (c) dry yeast (d) a small bottle
15. 15.🔮 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
16. 16.⚖️ 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) False (b) True
17. 17.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
18. 18.⚖️ 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 measure it (c) we keep it the same
19. 19.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
20. 20.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) time (d) sugar
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True
22. 22.🍞 Which of these is something yeast needs? (a) time (b) sunlight (c) salt (d) a magnet
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) size of the balloon (c) the water temperature
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
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 sugar (b) size of the balloon (c) the amount of water (d) the same bottles
26. 26.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
27. 27.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
28. 28.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
29. 29.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
30. 30.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
31. 31.True or false: time is something yeast does not need. (a) False (b) True
32. 32.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) a magnet (d) sugar
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a small bottle (c) sugar (d) a mirror
35. 35.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) salt (d) sugar
36. 36.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) very salty (d) boiling hot
37. 37.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to make it sweet (d) to colour it
38. 38.True or false: sugar is something yeast needs. (a) False (b) True
39. 39.True or false: sugar is something yeast does not need. (a) True (b) False
40. 40.True or false: a comb is not needed for the yeast balloon. (a) True (b) False

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