Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 939 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) sugar (d) a mirror
2. 2.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a tiny living fungus (d) a kind of stone
3. 3.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
4. 4.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
5. 5.True or false: a magnet is something yeast does not need. (a) False (b) True
6. 6.⚖️ 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
7. 7.⚖️ 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
8. 8.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it grows much faster (d) it bursts at once
9. 9.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
10. 10.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
11. 11.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a balloon (d) a battery cell
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) air from outside (d) smoke
14. 14.⚖️ 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 change it (b) we keep it the same (c) we measure it
15. 15.True or false: vinegar is something yeast needs. (a) False (b) True
16. 16.🍞 Which of these is something yeast does not need? (a) sugar (b) salt (c) time (d) warm water
17. 17.🔍 Which is the odd one out? (a) sugar (b) warm water (c) sunlight (d) time
18. 18.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) salt
19. 19.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
20. 20.🍞 Which of these is something yeast does not need? (a) warm water (b) sunlight (c) sugar (d) time
21. 21.⚖️ 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) size of the balloon (d) the water temperature
22. 22.🔍 Which is the odd one out? (a) salt (b) a magnet (c) sunlight (d) time
23. 23.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a small bottle (c) turmeric powder (d) a battery cell
24. 24.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) it shrinks to nothing (d) the balloon is smaller
25. 25.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold slows yeast down (d) cold kills sugar
26. 26.🍞 Which of these is something yeast needs? (a) vinegar (b) sugar (c) sunlight (d) salt
27. 27.⚖️ 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
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a small bottle (d) a comb
29. 29.⚖️ 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 measure it (c) we change it
30. 30.⚖️ 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
31. 31.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
32. 32.⚖️ 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 amount of sugar (c) size of the balloon (d) the water temperature
33. 33.🔍 Which is the odd one out? (a) a magnet (b) salt (c) sugar (d) sunlight
34. 34.⚖️ 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) True (b) False
35. 35.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to wash dishes (d) to colour rice
36. 36.🍞 Which of these is something yeast does not need? (a) warm water (b) a magnet (c) time (d) sugar
37. 37.🔍 Which is the odd one out? (a) sugar (b) time (c) a magnet (d) warm water
38. 38.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
39. 39.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
40. 40.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed

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