Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 122 · 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 kept the same? (a) size of the balloon (b) the water temperature (c) the amount of yeast
2. 2.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) sunlight (d) warm water
3. 3.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) salt (d) time
4. 4.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a mirror (c) a magnet (d) turmeric powder
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) True (b) False
6. 6.True or false: time is something yeast does not need. (a) False (b) True
7. 7.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
8. 8.⚖️ 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 water temperature (c) the amount of yeast (d) size of the balloon
9. 9.True or false: vinegar is something yeast needs. (a) False (b) True
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) warm water (c) a comb (d) turmeric powder
11. 11.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.True or false: warm water is something yeast does not need. (a) True (b) False
13. 13.⚖️ 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
14. 14.⚖️ 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 same bottles
15. 15.⚖️ 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) True (b) False
16. 16.⚖️ 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 amount of water (c) the same bottles (d) the water temperature
17. 17.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to make bread rise (d) to clean floors
18. 18.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) sugar (d) time
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 water”? (a) we change it (b) we measure it (c) we keep it the same
20. 20.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
21. 21.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) the balloon is smaller (d) it shrinks to nothing
22. 22.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) a magnet (d) salt
23. 23.🛟 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
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a small bottle (d) a paper clip
25. 25.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
26. 26.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it glows (d) it turns to sugar
27. 27.True or false: salt is something yeast needs. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) a magnet (b) time (c) sunlight (d) salt
29. 29.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
30. 30.🔮 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
31. 31.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) a magnet
32. 32.True or false: warm water is something yeast needs. (a) True (b) False
33. 33.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a balloon (d) a mirror
34. 34.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
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 keep it the same (b) we change it (c) we measure it
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a balloon (c) a small bottle (d) dry yeast
37. 37.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
38. 38.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) sunlight
39. 39.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
40. 40.🔍 Which is the odd one out? (a) time (b) salt (c) warm water (d) sugar

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