Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 233 · 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 wash dishes (b) to clean floors (c) to colour rice (d) to make bread rise
2. 2.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
4. 4.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) smoke (d) air from outside
5. 5.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) time (d) sugar
6. 6.True or false: sugar is something yeast does not need. (a) False (b) True
7. 7.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a tiny living fungus (d) a kind of salt
8. 8.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) a magnet
9. 9.⚖️ 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
10. 10.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) sunlight
11. 11.⚖️ 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 sugar
12. 12.⚖️ 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 water (b) the amount of sugar (c) the same bottles (d) the water temperature
13. 13.⚖️ 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
14. 14.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) sugar (d) a battery cell
16. 16.⚖️ 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 keep it the same (c) we change it
17. 17.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) the yeast is killed (c) it glows (d) it grows faster
18. 18.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
19. 19.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (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? Which of these is what we measure? (a) the same bottles (b) the amount of sugar (c) the amount of water (d) size of the balloon
21. 21.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
22. 22.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
23. 23.True or false: vinegar is something yeast needs. (a) True (b) False
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a mirror (c) a small bottle (d) warm water
25. 25.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
26. 26.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it grows much faster (d) it bursts at once
27. 27.⚖️ 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
28. 28.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) sunlight
29. 29.⚖️ 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 amount of yeast (c) size of the balloon
30. 30.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) salt (d) time
31. 31.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a battery cell (c) a comb (d) a balloon
32. 32.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a magnet (c) a small bottle (d) sugar
34. 34.🍞 Which of these is something yeast needs? (a) warm water (b) vinegar (c) salt (d) a magnet
35. 35.⚖️ 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 measure it (c) we change it
36. 36.⚖️ 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
37. 37.True or false: sugar is something yeast needs. (a) True (b) False
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) a mirror (d) dry yeast
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a magnet (d) sugar
40. 40.🍞 Which of these is something yeast does not need? (a) vinegar (b) time (c) sugar (d) warm water

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