Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 958 · 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.🔍 Which is the odd one out? (a) a magnet (b) sugar (c) warm water (d) time
2. 2.🔮 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
3. 3.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) sugar (d) a magnet
4. 4.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of stone (d) a kind of salt
5. 5.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
6. 6.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) turmeric powder (c) a balloon (d) warm water
7. 7.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
8. 8.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) boiling hot (d) very salty
9. 9.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold slows yeast down (d) cold water is heavy
10. 10.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
11. 11.🍞 Which of these is something yeast does not need? (a) sugar (b) salt (c) warm water (d) time
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of yeast”? (a) we keep it the same (b) we change it (c) we measure it
13. 13.True or false: sugar is needed for the yeast balloon. (a) False (b) True
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) turmeric powder (d) a balloon
15. 15.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) pour it down the sink (d) throw it at a wall
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a magnet (d) dry yeast
17. 17.True or false: sunlight is something yeast needs. (a) True (b) False
18. 18.True or false: warm water is something yeast needs. (a) True (b) False
19. 19.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
20. 20.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) warm water (d) time
21. 21.⚖️ 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 change it (b) we measure it (c) we keep it the same
22. 22.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
23. 23.True or false: vinegar is something yeast does not need. (a) True (b) False
24. 24.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
26. 26.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it grows much faster (d) it turns yellow
27. 27.🍞 Which of these is something yeast does not need? (a) sunlight (b) time (c) warm water (d) sugar
28. 28.🔍 Which is the odd one out? (a) a magnet (b) vinegar (c) salt (d) sugar
29. 29.⚖️ 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
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) the water temperature (c) size of the balloon
31. 31.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of yeast (b) size of the balloon (c) the water temperature
33. 33.True or false: vinegar is something yeast needs. (a) False (b) True
34. 34.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) steam (d) smoke
35. 35.True or false: dry yeast 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 balloon (b) dry yeast (c) a mirror (d) warm water
37. 37.⚖️ 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
38. 38.⚖️ 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 keep it the same (c) we measure it
39. 39.⚖️ 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 change it (b) we keep it the same (c) we measure it
40. 40.⚖️ 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) size of the balloon (b) the water temperature (c) the same bottles (d) the amount of water

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