Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 428 · 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: size of the balloon is the one thing we change. (a) False (b) True
2. 2.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) dry yeast (c) sugar (d) a balloon
4. 4.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) steam (d) smoke
5. 5.🍞 Which of these is something yeast does not need? (a) sugar (b) sunlight (c) warm water (d) time
6. 6.⚖️ 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
7. 7.⚖️ 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
8. 8.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
9. 9.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) sugar (d) time
11. 11.🔮 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
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) False (b) True
13. 13.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a small bottle (c) dry yeast (d) a battery cell
15. 15.⚖️ 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 water temperature (c) the amount of sugar (d) the amount of yeast
16. 16.⚖️ 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 water (c) size of the balloon
17. 17.True or false: vinegar is something yeast needs. (a) False (b) True
18. 18.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it turns to sugar (d) it grows faster
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 measure it (b) we change it (c) we keep it the same
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) warm water (c) dry yeast (d) a balloon
21. 21.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
22. 22.🔮 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
23. 23.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
24. 24.⚖️ 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 change it (b) we keep it the same (c) we measure it
25. 25.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
26. 26.🛟 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
27. 27.📘 What is yeast? (a) a kind of salt (b) a tiny living fungus (c) a kind of sugar (d) a kind of stone
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) turmeric powder (d) warm water
29. 29.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) time (d) sunlight
30. 30.True or false: a magnet is something yeast does not need. (a) False (b) True
31. 31.True or false: time is something yeast does not need. (a) False (b) True
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a balloon (c) a mirror (d) dry yeast
33. 33.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a comb (c) warm water (d) a paper clip
34. 34.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to make bread rise (d) to clean floors
35. 35.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
36. 36.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
37. 37.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
38. 38.⚖️ 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 water temperature (c) size of the balloon (d) the amount of sugar
39. 39.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
40. 40.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed

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