Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 86 · 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? What do we do with “the amount of water”? (a) we measure it (b) we keep it the same (c) we change it
2. 2.True or false: sugar is something yeast does not need. (a) True (b) False
3. 3.⚖️ 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) True (b) False
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.True or false: a magnet is something yeast needs. (a) True (b) False
6. 6.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) dry yeast (c) warm water (d) a balloon
8. 8.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
9. 9.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
10. 10.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) salt (d) time
11. 11.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
13. 13.⚖️ 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 sugar (d) the amount of yeast
14. 14.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a comb (d) a small bottle
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) sugar (d) a paper clip
17. 17.True or false: sugar is needed for the yeast balloon. (a) False (b) True
18. 18.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) the yeast is killed (d) it grows faster
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a balloon (c) sugar (d) dry yeast
20. 20.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold water is heavy (d) cold makes it pink
21. 21.🔮 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
22. 22.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
23. 23.🔮 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
24. 24.⚖️ 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 measure it (b) we keep it the same (c) we change it
25. 25.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
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 keep it the same (b) we measure it (c) we change it
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a mirror (c) a small bottle (d) a balloon
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
29. 29.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) turmeric powder (c) a balloon (d) a magnet
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) dry yeast (d) sugar
31. 31.🍞 Which of these is something yeast does not need? (a) time (b) sugar (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) size of the balloon (b) the water temperature (c) the amount of sugar
33. 33.⚖️ 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 same bottles (c) the water temperature
34. 34.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
35. 35.⚖️ 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 measure it (b) we change it (c) we keep it the same
36. 36.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) it is food for yeast (d) to make it sweet
37. 37.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) salt
38. 38.⚖️ 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
39. 39.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
40. 40.⚖️ 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 measure it (b) we keep it the same (c) we change it

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