Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 689 · 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.True or false: a magnet is something yeast needs. (a) False (b) True
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) True (b) False
3. 3.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
4. 4.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
5. 5.True or false: sunlight is something yeast needs. (a) True (b) False
6. 6.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) it shrinks to nothing (d) the balloon is bigger
7. 7.🔍 Which is the odd one out? (a) sugar (b) salt (c) time (d) warm water
8. 8.True or false: a comb is needed for the yeast balloon. (a) False (b) True
9. 9.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) sugar (d) vinegar
10. 10.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) turmeric powder (d) a balloon
12. 12.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
13. 13.⚖️ 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
14. 14.🍞 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
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) turmeric powder (d) sugar
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of water (c) the same bottles (d) the amount of yeast
17. 17.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a mirror (c) a battery cell (d) dry yeast
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 what we measure. (a) True (b) False
19. 19.True or false: sugar is something yeast does not need. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) time (d) sugar
21. 21.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it grows much faster (d) it bursts at once
22. 22.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to colour rice (d) to clean floors
23. 23.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) throw it at a wall (d) put it in your mouth
24. 24.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
25. 25.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) sunlight (d) time
26. 26.True or false: warm water is something yeast does not need. (a) False (b) True
27. 27.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
29. 29.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
30. 30.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) True (b) False
32. 32.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
33. 33.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold makes it pink (d) cold slows yeast down
34. 34.⚖️ 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
35. 35.🔍 Which is the odd one out? (a) vinegar (b) salt (c) a magnet (d) warm water
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) warm water (d) a comb
37. 37.True or false: warm water is something yeast needs. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) salt (d) vinegar
39. 39.True or false: salt is something yeast needs. (a) True (b) False
40. 40.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it

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