Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 325 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) sugar (d) a mirror
2. 2.True or false: salt is something yeast needs. (a) False (b) True
3. 3.⚖️ 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
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) size of the balloon (c) the amount of sugar (d) the amount of yeast
5. 5.⚖️ 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) size of the balloon (c) the amount of yeast
6. 6.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
7. 7.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
8. 8.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
9. 9.⚖️ 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 change it (c) we measure it
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
11. 11.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a paper clip (c) sugar (d) a balloon
13. 13.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
14. 14.True or false: sugar is something yeast does not need. (a) True (b) False
15. 15.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it glows (d) it grows faster
16. 16.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
17. 17.🔍 Which is the odd one out? (a) salt (b) sugar (c) warm water (d) time
18. 18.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold slows yeast down (c) cold water is heavy (d) cold kills sugar
19. 19.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) it is food for yeast (d) to colour it
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) a paper clip (d) a small bottle
21. 21.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
22. 22.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
23. 23.True or false: sugar is something yeast needs. (a) False (b) True
24. 24.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
25. 25.⚖️ 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
26. 26.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
27. 27.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) salt (d) a magnet
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) dry yeast (d) turmeric powder
30. 30.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) time (d) a magnet
31. 31.⚖️ 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
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) a small bottle (c) sugar (d) dry yeast
33. 33.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) it shrinks to nothing (d) the balloon is smaller
34. 34.⚖️ 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) size of the balloon (c) the amount of water (d) the amount of yeast
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) False (b) True
36. 36.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
37. 37.⚖️ 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) size of the balloon (c) the amount of sugar
38. 38.⚖️ 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
39. 39.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) turmeric powder (c) a magnet (d) a mirror
40. 40.🔍 Which is the odd one out? (a) time (b) warm water (c) vinegar (d) sugar

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