Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 379 · 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 water temperature”? (a) we keep it the same (b) we measure it (c) we change it
2. 2.⚖️ 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
3. 3.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
4. 4.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
5. 5.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) sugar (d) salt
6. 6.⚖️ 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
7. 7.⚖️ 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) True (b) False
8. 8.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) warm water (d) a paper clip
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a balloon (d) a mirror
10. 10.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold makes it pink (d) cold slows yeast down
11. 11.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) air from outside (d) smoke
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
13. 13.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
14. 14.🔮 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
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a balloon (d) a paper clip
16. 16.⚖️ 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 amount of sugar (b) the water temperature (c) the same bottles (d) size of the balloon
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 what we measure. (a) True (b) False
18. 18.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) sunlight (d) salt
20. 20.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
21. 21.⚖️ 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) the same bottles (c) size of the balloon
22. 22.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) vinegar
23. 23.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) a magnet (d) warm water
24. 24.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) vinegar (d) time
25. 25.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of salt (d) a kind of stone
26. 26.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
27. 27.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) ice cold (d) warm, not hot
28. 28.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a magnet (d) a small bottle
30. 30.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) throw it at a wall (d) keep it for a month
31. 31.True or false: time is something yeast needs. (a) False (b) True
32. 32.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a battery cell (c) a small bottle (d) a comb
33. 33.True or false: sugar is something yeast needs. (a) True (b) False
34. 34.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.True or false: sunlight is something yeast needs. (a) True (b) False
36. 36.⚖️ 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
37. 37.True or false: sunlight is something yeast does not need. (a) True (b) False
38. 38.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) a magnet (d) sugar
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) sugar (c) dry yeast (d) warm water
40. 40.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a battery cell (c) a small bottle (d) warm water

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