Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 509 · 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 does not need? (a) time (b) salt (c) sugar (d) warm water
2. 2.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a paper clip (c) dry yeast (d) a mirror
3. 3.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) a small bottle (d) a mirror
5. 5.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
6. 6.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
7. 7.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a mirror (c) a magnet (d) a paper clip
8. 8.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) put it in your mouth (d) throw it at a wall
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 water”? (a) we keep it the same (b) we measure it (c) we change it
10. 10.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
11. 11.⚖️ 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
12. 12.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
13. 13.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
14. 14.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
15. 15.🍞 Which of these is something yeast does not need? (a) a magnet (b) warm water (c) sugar (d) time
16. 16.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a comb (c) a balloon (d) sugar
17. 17.⚖️ 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) False (b) True
18. 18.⚖️ 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
19. 19.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) sugar (d) a magnet
20. 20.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
21. 21.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
22. 22.⚖️ 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 keep it the same (c) we measure it
23. 23.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
24. 24.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a battery cell (c) a balloon (d) a magnet
25. 25.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
26. 26.🍞 Which of these is something yeast does not need? (a) vinegar (b) sugar (c) warm water (d) time
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) size of the balloon (c) the water temperature
28. 28.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
29. 29.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) salt (d) sugar
30. 30.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
31. 31.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) time (d) vinegar
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) a balloon (c) sugar (d) dry yeast
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a battery cell (d) a balloon
34. 34.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
35. 35.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
36. 36.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) it shrinks to nothing (d) the balloon is bigger
37. 37.⚖️ 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 yeast (b) the amount of sugar (c) the amount of water (d) the water temperature
38. 38.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.True or false: warm water is needed for the yeast balloon. (a) False (b) True
40. 40.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it glows (d) it turns to sugar

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