Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 610 · 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.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
2. 2.⚖️ 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) False (b) True
3. 3.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) sugar (d) salt
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a balloon (d) a comb
5. 5.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
6. 6.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of salt (d) a kind of sugar
7. 7.⚖️ 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) size of the balloon (c) the same bottles (d) the amount of yeast
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) False (b) True
9. 9.True or false: sunlight is something yeast does not need. (a) False (b) True
10. 10.🔮 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
11. 11.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
12. 12.⚖️ 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) True (b) False
13. 13.🍞 Which of these is something yeast does not need? (a) sugar (b) sunlight (c) warm water (d) time
14. 14.⚖️ 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 water (b) size of the balloon (c) the water temperature (d) the amount of yeast
15. 15.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
16. 16.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) sugar (c) a small bottle (d) a balloon
18. 18.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
19. 19.⚖️ 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
20. 20.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) steam (d) smoke
21. 21.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) the same bottles (c) size of the balloon
23. 23.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
24. 24.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) a paper clip (d) dry yeast
25. 25.True or false: warm water is something yeast needs. (a) False (b) True
26. 26.🍞 Which of these is something yeast needs? (a) sunlight (b) sugar (c) a magnet (d) salt
27. 27.🔍 Which is the odd one out? (a) warm water (b) sugar (c) time (d) salt
28. 28.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) False (b) True
30. 30.⚖️ 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
31. 31.True or false: a magnet is something yeast needs. (a) True (b) False
32. 32.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
33. 33.🍞 Which of these is something yeast does not need? (a) vinegar (b) time (c) sugar (d) warm water
34. 34.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
35. 35.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) sunlight
36. 36.True or false: sugar is something yeast does not need. (a) True (b) False
37. 37.True or false: vinegar is something yeast does not need. (a) False (b) True
38. 38.True or false: warm water is needed for the yeast balloon. (a) False (b) True
39. 39.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
40. 40.🔮 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

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