Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 612 · 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.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) steam (d) smoke
2. 2.⚖️ 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 keep it the same (c) we change it
3. 3.⚖️ 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
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) a battery cell (d) dry yeast
5. 5.True or false: warm water is something yeast needs. (a) False (b) True
6. 6.⚖️ 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 sugar (b) the amount of yeast (c) size of the balloon (d) the water temperature
7. 7.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) ice cold (d) boiling hot
8. 8.⚖️ 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
9. 9.🔮 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
10. 10.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold makes it pink (d) cold slows yeast down
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 same bottles (c) the water temperature
12. 12.⚖️ 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 keep it the same (b) we change it (c) we measure it
13. 13.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) the balloon is smaller (d) it turns to bread
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a small bottle (c) dry yeast (d) turmeric powder
16. 16.True or false: vinegar is something yeast needs. (a) True (b) False
17. 17.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) a balloon (d) a magnet
18. 18.⚖️ 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) size of the balloon (c) the amount of water (d) the same bottles
19. 19.True or false: sunlight is something yeast does not need. (a) True (b) False
20. 20.True or false: sugar is something yeast does not need. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) salt (b) sugar (c) time (d) warm water
22. 22.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) a small bottle (c) dry yeast (d) a balloon
23. 23.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) turmeric powder (c) a comb (d) a mirror
24. 24.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) a paper clip (d) sugar
26. 26.🔍 Which is the odd one out? (a) vinegar (b) salt (c) sunlight (d) time
27. 27.⚖️ 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
28. 28.⚖️ 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 measure it (c) we keep it the same
29. 29.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) it is food for yeast (d) to colour it
30. 30.True or false: warm water is something yeast does not need. (a) True (b) False
31. 31.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) put it in your mouth (d) keep it for a month
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 water temperature (b) the amount of sugar (c) size of the balloon
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) turmeric powder (c) sugar (d) a balloon
34. 34.⚖️ 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
35. 35.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it turns to sugar (d) it glows
36. 36.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) a magnet
37. 37.🔍 Which is the odd one out? (a) salt (b) a magnet (c) warm water (d) vinegar
38. 38.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) a small bottle (d) sugar
40. 40.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed

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