Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 127 · 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 not needed for the yeast balloon. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) salt (d) sunlight
3. 3.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) carbon dioxide gas (d) smoke
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a paper clip (c) a magnet (d) sugar
5. 5.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
6. 6.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of yeast (b) size of the balloon (c) the amount of water (d) the water temperature
8. 8.True or false: vinegar is something yeast does not need. (a) False (b) True
9. 9.⚖️ 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 amount of water (c) the water temperature
10. 10.⚖️ 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) size of the balloon (c) the same bottles
11. 11.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) warm water (d) vinegar
12. 12.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) vinegar
13. 13.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
14. 14.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
15. 15.True or false: sugar is something yeast does not need. (a) False (b) True
16. 16.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
18. 18.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) sunlight (d) time
19. 19.⚖️ 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) False (b) True
20. 20.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
21. 21.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a comb (c) a balloon (d) sugar
23. 23.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) vinegar (d) time
24. 24.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
25. 25.⚖️ 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
26. 26.True or false: sunlight is something yeast needs. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) time (d) warm water
28. 28.True or false: a magnet is something yeast does not need. (a) False (b) True
29. 29.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it glows (d) it grows faster
30. 30.🍞 Which of these is something yeast does not need? (a) salt (b) sugar (c) time (d) warm water
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
32. 32.True or false: sunlight is something yeast does not need. (a) True (b) False
33. 33.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a small bottle (c) a comb (d) a paper clip
34. 34.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False
36. 36.⚖️ 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 yeast (b) the amount of sugar (c) the water temperature (d) size of the balloon
37. 37.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a paper clip (d) a small bottle
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a magnet (c) dry yeast (d) sugar
39. 39.True or false: warm water is needed for the yeast balloon. (a) False (b) True
40. 40.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it

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