Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 88 · 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.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
2. 2.⚖️ 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 change it (b) we measure it (c) we keep it the same
3. 3.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
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) size of the balloon (b) the water temperature (c) the same bottles
6. 6.🍞 Which of these is something yeast does not need? (a) sugar (b) sunlight (c) warm water (d) time
7. 7.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a tiny living fungus (d) a kind of sugar
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the water temperature”? (a) we change it (b) we keep it the same (c) we measure it
9. 9.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) the yeast is killed (c) it grows faster (d) it glows
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) a comb (d) dry yeast
11. 11.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
12. 12.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it turns yellow (d) it bursts at once
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) warm water (d) sugar
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) turmeric powder (c) a mirror (d) a balloon
15. 15.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) salt (d) warm water
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) a magnet (d) salt
18. 18.⚖️ 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) the water temperature (c) size of the balloon (d) the amount of yeast
19. 19.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to colour it (d) to make it sweet
20. 20.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) sugar (d) a comb
22. 22.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
23. 23.True or false: sugar is needed for the yeast balloon. (a) False (b) True
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a small bottle (d) a paper clip
25. 25.⚖️ 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 sugar
26. 26.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
27. 27.True or false: vinegar is something yeast needs. (a) False (b) True
28. 28.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) warm water (d) a battery cell
29. 29.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
30. 30.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) the balloon is bigger (d) it shrinks to nothing
31. 31.🍞 Which of these is something yeast needs? (a) vinegar (b) sugar (c) sunlight (d) salt
32. 32.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) salt (d) a magnet
34. 34.True or false: warm water is something yeast does not need. (a) True (b) False
35. 35.True or false: a magnet is something yeast needs. (a) True (b) False
36. 36.True or false: a comb is needed for the yeast balloon. (a) True (b) False
37. 37.🍞 Which of these is something yeast does not need? (a) sugar (b) vinegar (c) warm water (d) time
38. 38.True or false: sunlight is something yeast does not need. (a) False (b) True
39. 39.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold slows yeast down (d) cold water is heavy
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a comb (c) dry yeast (d) sugar

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