Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 578 · 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 of these is something yeast needs? (a) sunlight (b) a magnet (c) salt (d) time
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a small bottle (d) a mirror
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a mirror (d) warm water
4. 4.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) boiling hot (d) very salty
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) dry yeast (d) a paper clip
6. 6.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it bursts at once (d) it grows much faster
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) sugar (d) a battery cell
8. 8.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
9. 9.⚖️ 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 amount of yeast (c) the water temperature
10. 10.True or false: a magnet is something yeast does not need. (a) False (b) True
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) sugar (c) warm water (d) dry yeast
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a balloon (d) a magnet
13. 13.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a magnet (c) a small bottle (d) dry yeast
15. 15.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) to colour it (d) it is food for yeast
16. 16.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
17. 17.⚖️ 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
18. 18.⚖️ 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
19. 19.⚖️ 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 water (c) the amount of sugar (d) the amount of yeast
20. 20.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
21. 21.🔮 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
22. 22.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
23. 23.True or false: sunlight is something yeast does not need. (a) False (b) True
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) turmeric powder (c) warm water (d) sugar
25. 25.🔍 Which is the odd one out? (a) sugar (b) warm water (c) a magnet (d) time
26. 26.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) warm water (d) vinegar
27. 27.🍞 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
28. 28.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) it turns to sugar (d) the yeast is killed
29. 29.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
30. 30.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
31. 31.True or false: salt is something yeast needs. (a) False (b) True
32. 32.⚖️ 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 same bottles (d) the amount of yeast
33. 33.⚖️ 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 keep it the same (b) we change it (c) we measure it
34. 34.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) turmeric powder (d) a balloon
35. 35.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
36. 36.True or false: vinegar is something yeast needs. (a) False (b) True
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
38. 38.⚖️ 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 measure it (c) we change it
39. 39.True or false: time is something yeast does not need. (a) True (b) False
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) True (b) False

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