Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 380 · 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? What do we do with “the amount of water”? (a) we change it (b) we keep it the same (c) we measure it
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
3. 3.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it bursts at once (d) it grows much faster
4. 4.🛟 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
5. 5.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.⚖️ 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 change it (b) we keep it the same (c) we measure it
7. 7.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) air from outside (c) smoke (d) carbon dioxide gas
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a comb (d) a balloon
9. 9.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a tiny living fungus (d) a kind of sugar
10. 10.True or false: time is something yeast does not need. (a) True (b) False
11. 11.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
12. 12.🔮 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
13. 13.True or false: warm water is something yeast does not need. (a) False (b) True
14. 14.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) vinegar (d) sugar
15. 15.🔍 Which is the odd one out? (a) salt (b) sunlight (c) sugar (d) a magnet
16. 16.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) dry yeast (c) a small bottle (d) sugar
18. 18.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
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) True (b) False
20. 20.⚖️ 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 change it (c) we measure it
21. 21.⚖️ 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 sugar (c) the water temperature
22. 22.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
23. 23.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) salt
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) a magnet (b) time (c) vinegar (d) salt
26. 26.🍞 Which of these is something yeast needs? (a) sunlight (b) a magnet (c) salt (d) time
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a paper clip (d) sugar
28. 28.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
29. 29.🔮 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
30. 30.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
31. 31.⚖️ 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 amount of yeast (c) size of the balloon (d) the amount of sugar
32. 32.⚖️ 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 change it (b) we keep it the same (c) we measure it
33. 33.⚖️ 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
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a comb (c) a small bottle (d) warm water
35. 35.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
36. 36.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) True (b) False
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
39. 39.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) sunlight
40. 40.True or false: vinegar is something yeast needs. (a) False (b) True

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