Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 421 · 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: the amount of sugar is the one thing we change. (a) False (b) True
2. 2.⚖️ 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 same bottles (b) size of the balloon (c) the amount of sugar (d) the water temperature
3. 3.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a tiny living fungus (d) a kind of sugar
4. 4.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
5. 5.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) the yeast is killed (d) it glows
6. 6.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) steam (d) smoke
7. 7.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
8. 8.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
9. 9.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a battery cell (c) a comb (d) turmeric powder
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) turmeric powder (c) a small bottle (d) dry yeast
11. 11.True or false: vinegar is something yeast does not need. (a) True (b) False
12. 12.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
13. 13.True or false: time is something yeast needs. (a) False (b) True
14. 14.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
16. 16.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) sunlight (d) warm water
17. 17.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
18. 18.⚖️ 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 keep it the same (b) we measure it (c) we change it
19. 19.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
20. 20.⚖️ 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 measure it (b) we change it (c) we keep it the same
21. 21.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) a magnet
22. 22.True or false: sunlight is something yeast needs. (a) False (b) True
23. 23.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) sunlight
24. 24.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
25. 25.True or false: sugar is something yeast does not need. (a) False (b) True
26. 26.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a small bottle (c) a balloon (d) dry yeast
28. 28.🔍 Which is the odd one out? (a) a magnet (b) salt (c) vinegar (d) warm water
29. 29.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) put it in your mouth (d) throw it at a wall
30. 30.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a battery cell (c) sugar (d) dry yeast
31. 31.🔍 Which is the odd one out? (a) sugar (b) time (c) salt (d) warm water
32. 32.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a mirror (c) a comb (d) a magnet
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a paper clip (d) a balloon
35. 35.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) to colour it (d) it is food for yeast
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
37. 37.⚖️ 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
38. 38.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
39. 39.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a paper clip (c) turmeric powder (d) a battery cell
40. 40.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True

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