Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 961 · 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? Which of these is what we measure? (a) the water temperature (b) the amount of yeast (c) the amount of sugar (d) size of the balloon
2. 2.True or false: time is something yeast needs. (a) False (b) True
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) dry yeast (d) a paper clip
4. 4.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) carbon dioxide gas (d) smoke
5. 5.⚖️ 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
6. 6.⚖️ 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
7. 7.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
8. 8.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) a mirror (d) dry yeast
9. 9.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it grows much faster (d) it turns yellow
10. 10.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
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 water temperature (c) the amount of sugar
12. 12.🍞 Which of these is something yeast does not need? (a) sugar (b) a magnet (c) time (d) warm water
13. 13.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
14. 14.🔍 Which is the odd one out? (a) a magnet (b) time (c) sugar (d) warm water
15. 15.⚖️ 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 change it (b) we measure it (c) we keep it the same
16. 16.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to wash dishes (d) to clean floors
17. 17.True or false: vinegar is something yeast needs. (a) True (b) False
18. 18.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) time (d) sugar
19. 19.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
20. 20.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) warm water (d) a magnet
22. 22.⚖️ 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) True (b) False
23. 23.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
24. 24.🍞 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
25. 25.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a comb (c) dry yeast (d) a small bottle
27. 27.True or false: sugar is something yeast needs. (a) False (b) True
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a mirror (c) dry yeast (d) sugar
29. 29.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) salt (d) vinegar
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) dry yeast (d) a battery cell
31. 31.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) vinegar (d) sugar
32. 32.⚖️ 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 water (c) the water temperature
33. 33.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) a magnet (d) time
34. 34.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
35. 35.⚖️ 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 measure it (b) we keep it the same (c) we change it
36. 36.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
37. 37.🔍 Which is the odd one out? (a) salt (b) a magnet (c) sunlight (d) time
38. 38.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
39. 39.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
40. 40.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a mirror (c) warm water (d) a comb

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