Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 679 · 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.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) throw it at a wall (d) keep it for a month
2. 2.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
3. 3.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is bigger (c) the balloon is smaller (d) it shrinks to nothing
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) dry yeast (d) a magnet
5. 5.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
7. 7.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold slows yeast down (d) cold water is heavy
8. 8.⚖️ 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
9. 9.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) vinegar (d) sunlight
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) a balloon (d) a magnet
11. 11.True or false: a magnet is something yeast does not need. (a) True (b) False
12. 12.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
13. 13.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) a battery cell (d) dry yeast
15. 15.True or false: sunlight is something yeast needs. (a) True (b) False
16. 16.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
17. 17.True or false: salt is something yeast needs. (a) False (b) True
18. 18.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a kind of sugar (d) a tiny living fungus
19. 19.⚖️ 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 water temperature (c) the amount of sugar (d) the amount of water
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.⚖️ 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 amount of sugar
22. 22.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) a battery cell (d) a balloon
23. 23.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) warm water (c) a balloon (d) dry yeast
25. 25.⚖️ 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
26. 26.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
27. 27.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
28. 28.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
29. 29.True or false: salt is something yeast does not need. (a) False (b) True
30. 30.⚖️ 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
31. 31.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) smoke (d) steam
32. 32.🔍 Which is the odd one out? (a) time (b) warm water (c) salt (d) sugar
33. 33.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
35. 35.⚖️ 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 keep it the same (b) we change it (c) we measure it
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a comb (d) a balloon
37. 37.🔍 Which is the odd one out? (a) vinegar (b) salt (c) time (d) sunlight
38. 38.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) sunlight
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a battery cell (c) a balloon (d) warm water
40. 40.⚖️ 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 water (b) the water temperature (c) the amount of sugar (d) size of the balloon

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