Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 763 · 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: size of the balloon is what we measure. (a) True (b) False
2. 2.⚖️ 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 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? What do we do with “size of the balloon”? (a) we keep it the same (b) we change it (c) we measure it
4. 4.True or false: salt is something yeast needs. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) sugar (d) salt
6. 6.True or false: sunlight is something yeast needs. (a) False (b) True
7. 7.True or false: a comb is needed for the yeast balloon. (a) False (b) True
8. 8.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) warm water (c) a battery cell (d) a paper clip
9. 9.True or false: sugar is something yeast needs. (a) True (b) False
10. 10.True or false: sugar is needed for the yeast balloon. (a) True (b) False
11. 11.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) warm water (c) a small bottle (d) sugar
14. 14.🔍 Which is the odd one out? (a) salt (b) sunlight (c) a magnet (d) warm water
15. 15.⚖️ 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) False (b) True
16. 16.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a small bottle (c) turmeric powder (d) a magnet
17. 17.⚖️ 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
18. 18.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
19. 19.⚖️ 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 keep it the same (c) we change it
20. 20.⚖️ 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
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) a mirror (d) dry yeast
22. 22.🛟 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
23. 23.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.⚖️ 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 measure it (b) we keep it the same (c) we change it
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of water (c) the amount of yeast (d) the same bottles
26. 26.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
27. 27.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) salt (d) time
28. 28.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
29. 29.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
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 water temperature (b) the amount of sugar (c) size of the balloon
31. 31.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) a mirror (d) sugar
32. 32.⚖️ 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) the amount of water (d) the water temperature
33. 33.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
34. 34.⚖️ 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) False (b) True
35. 35.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
36. 36.⚖️ 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) True (b) False
37. 37.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
38. 38.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold slows yeast down (c) cold makes it pink (d) cold kills sugar
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) a small bottle (c) warm water (d) dry yeast
40. 40.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed

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