Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 726 · 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? True or false: the same bottles is kept the same. (a) False (b) True
2. 2.True or false: a magnet is something yeast does not need. (a) True (b) False
3. 3.⚖️ 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 change it (c) we keep it the same
4. 4.⚖️ 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 water temperature (b) the amount of water (c) size of the balloon (d) the same bottles
5. 5.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) the yeast is killed (d) it grows faster
6. 6.True or false: vinegar is something yeast needs. (a) False (b) True
7. 7.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
8. 8.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
9. 9.⚖️ 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) True (b) False
10. 10.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
11. 11.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
12. 12.True or false: warm water is something yeast does not need. (a) False (b) True
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) dry yeast (d) turmeric powder
14. 14.True or false: salt is something yeast needs. (a) False (b) True
15. 15.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
16. 16.True or false: a magnet is something yeast needs. (a) False (b) True
17. 17.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) air from outside (d) smoke
18. 18.⚖️ 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 keep it the same (b) we change it (c) we measure it
19. 19.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
20. 20.🔮 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
21. 21.🔍 Which is the odd one out? (a) time (b) salt (c) sunlight (d) vinegar
22. 22.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
23. 23.⚖️ 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
24. 24.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
25. 25.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) a small bottle (c) sugar (d) a balloon
27. 27.⚖️ 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 same bottles (c) size of the balloon (d) the water temperature
28. 28.🔍 Which is the odd one out? (a) sunlight (b) time (c) sugar (d) warm water
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a paper clip (d) a balloon
30. 30.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to make bread rise (d) to wash dishes
31. 31.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) sugar (d) a magnet
32. 32.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
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 comb (d) warm water
34. 34.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
35. 35.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) turmeric powder (c) a paper clip (d) a comb
37. 37.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
38. 38.True or false: sugar is needed for the yeast balloon. (a) False (b) True
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) True (b) False
40. 40.⚖️ 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 keep it the same (c) we measure it

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