Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 865 · 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.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
2. 2.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) the yeast is killed (d) it glows
3. 3.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to colour rice (d) to wash dishes
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 amount of yeast (b) the same bottles (c) size of the balloon (d) the water temperature
5. 5.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) warm, not hot (d) boiling hot
6. 6.🛟 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
7. 7.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
9. 9.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a magnet (c) a mirror (d) a paper clip
10. 10.True or false: warm water is something yeast does not need. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) warm water (d) vinegar
12. 12.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) warm water (d) sunlight
13. 13.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) the balloon is bigger (d) it shrinks to nothing
14. 14.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
15. 15.🍞 Which of these is something yeast does not need? (a) sunlight (b) warm water (c) sugar (d) time
16. 16.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
17. 17.True or false: sugar is needed for the yeast balloon. (a) True (b) False
18. 18.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a comb (c) sugar (d) a paper clip
19. 19.⚖️ 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
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) sugar (d) a magnet
21. 21.True or false: time is something yeast needs. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) time (b) sunlight (c) warm water (d) sugar
23. 23.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
24. 24.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
25. 25.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
27. 27.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
28. 28.True or false: salt is something yeast needs. (a) False (b) True
29. 29.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we change it (b) we keep it the same (c) we measure it
31. 31.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) salt
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a mirror (d) a small bottle
33. 33.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.⚖️ 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
35. 35.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
36. 36.True or false: vinegar is something yeast does not need. (a) False (b) True
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) False (b) True
38. 38.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it bursts at once (d) it grows much faster
39. 39.⚖️ 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
40. 40.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) sugar (d) time

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