Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 137 · 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 yeast”? (a) we measure it (b) we change it (c) we keep it the same
2. 2.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
3. 3.⚖️ 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) True (b) False
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a comb (c) dry yeast (d) a small bottle
5. 5.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) steam (d) smoke
6. 6.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
7. 7.True or false: time is something yeast needs. (a) True (b) False
8. 8.⚖️ 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 measure it (b) we change it (c) we keep it the same
9. 9.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it shrinks to nothing (d) it turns to bread
10. 10.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold slows yeast down (c) cold makes it pink (d) cold water is heavy
11. 11.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
12. 12.⚖️ 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 water (b) the amount of sugar (c) size of the balloon (d) the water temperature
13. 13.🔍 Which is the odd one out? (a) a magnet (b) salt (c) sugar (d) vinegar
14. 14.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) turmeric powder (c) a small bottle (d) sugar
16. 16.🍞 Which of these is something yeast needs? (a) sugar (b) vinegar (c) salt (d) sunlight
17. 17.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) warm water (d) a paper clip
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a magnet (d) a small bottle
19. 19.🔍 Which is the odd one out? (a) warm water (b) salt (c) sugar (d) time
20. 20.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) True (b) False
22. 22.⚖️ 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
23. 23.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
24. 24.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
25. 25.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to wash dishes (d) to clean floors
27. 27.🍞 Which of these is something yeast does not need? (a) warm water (b) sunlight (c) time (d) sugar
28. 28.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) warm water (c) sugar (d) a balloon
30. 30.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
31. 31.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) put it in your mouth (d) pour it down the sink
32. 32.True or false: salt is something yeast needs. (a) False (b) True
33. 33.⚖️ 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
34. 34.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of salt (d) a kind of stone
35. 35.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a balloon (c) a magnet (d) a small bottle
37. 37.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
38. 38.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
39. 39.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a comb (c) turmeric powder (d) a battery cell
40. 40.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it

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