Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 686 · 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.True or false: sugar is needed for the yeast balloon. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) sugar (b) warm water (c) a magnet (d) time
3. 3.True or false: a magnet is something yeast does not need. (a) True (b) False
4. 4.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it grows faster (d) it turns to sugar
5. 5.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) salt (d) warm water
6. 6.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
7. 7.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) sugar (d) time
8. 8.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
9. 9.🍞 Which of these is something yeast does not need? (a) vinegar (b) sugar (c) warm water (d) time
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) a magnet (d) a balloon
11. 11.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
13. 13.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
14. 14.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
15. 15.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
16. 16.⚖️ 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
17. 17.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
18. 18.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) warm water (d) a comb
20. 20.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
21. 21.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
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) size of the balloon (b) the water temperature (c) the amount of sugar
23. 23.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) turmeric powder (d) a small bottle
24. 24.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) vinegar (d) sugar
25. 25.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) a balloon (c) sugar (d) warm water
26. 26.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
27. 27.⚖️ 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 same bottles (c) the water temperature (d) size of the balloon
28. 28.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) air from outside (d) steam
29. 29.⚖️ 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
30. 30.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a magnet (d) a balloon
32. 32.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows very little (d) it grows much faster
33. 33.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) throw it at a wall (d) keep it for a month
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the same bottles (c) size of the balloon (d) the amount of sugar
35. 35.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) a mirror (d) dry yeast
37. 37.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) sunlight
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a paper clip (c) dry yeast (d) warm water
39. 39.⚖️ 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
40. 40.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False

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