Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 194 · 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: vinegar is something yeast needs. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) salt (b) vinegar (c) sunlight (d) sugar
3. 3.⚖️ 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
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a mirror (c) dry yeast (d) a small bottle
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a magnet (d) a small bottle
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) warm water (c) a battery cell (d) a paper clip
7. 7.⚖️ 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
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “size of the balloon”? (a) we change it (b) we keep it the same (c) we measure it
9. 9.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) time (d) salt
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a mirror (d) a small bottle
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) warm water (d) a magnet
12. 12.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
13. 13.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to wash dishes (d) to make bread rise
14. 14.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
15. 15.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) carbon dioxide gas (d) smoke
16. 16.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
17. 17.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a battery cell (c) dry yeast (d) a magnet
18. 18.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
19. 19.🔮 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
20. 20.⚖️ 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) False (b) True
21. 21.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
22. 22.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
23. 23.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) it is food for yeast (d) to colour it
24. 24.⚖️ 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 same bottles (b) the amount of yeast (c) the water temperature (d) the amount of water
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) a paper clip (d) dry yeast
26. 26.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
27. 27.True or false: sugar is something yeast does not need. (a) False (b) True
28. 28.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a comb (c) warm water (d) dry yeast
29. 29.⚖️ 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 yeast (b) size of the balloon (c) the same bottles (d) the water temperature
30. 30.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
31. 31.🔍 Which is the odd one out? (a) time (b) a magnet (c) warm water (d) sugar
32. 32.⚖️ 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) True (b) False
33. 33.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) vinegar (d) sunlight
34. 34.True or false: warm water is something yeast needs. (a) False (b) True
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) False (b) True
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) turmeric powder (c) warm water (d) a balloon
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) warm water (d) a comb
38. 38.⚖️ 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
39. 39.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) ice cold (d) very salty
40. 40.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed

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