Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 580 · 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.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) salt (d) sugar
2. 2.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
3. 3.⚖️ 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
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.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) a balloon (d) a paper clip
6. 6.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
7. 7.🔍 Which is the odd one out? (a) warm water (b) time (c) sunlight (d) sugar
8. 8.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it grows much faster (d) it bursts at once
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) False (b) True
10. 10.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
11. 11.True or false: warm water is something yeast needs. (a) True (b) False
12. 12.⚖️ 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 keep it the same (b) we change it (c) we measure it
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a battery cell (c) dry yeast (d) a small bottle
14. 14.True or false: sugar is something yeast does not need. (a) True (b) False
15. 15.⚖️ 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
16. 16.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
17. 17.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
18. 18.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
19. 19.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) turmeric powder (c) a small bottle (d) a comb
20. 20.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a balloon (d) a magnet
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) warm water (c) dry yeast (d) a small bottle
23. 23.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
24. 24.⚖️ 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
25. 25.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a mirror (c) a paper clip (d) turmeric powder
26. 26.True or false: warm water is needed for the yeast balloon. (a) False (b) True
27. 27.True or false: time is something yeast needs. (a) False (b) True
28. 28.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold slows yeast down (d) cold water is heavy
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a mirror (c) a balloon (d) a small bottle
30. 30.⚖️ 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 keep it the same (b) we change it (c) we measure it
31. 31.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to colour rice (d) to wash dishes
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 water (b) the amount of sugar (c) the amount of yeast (d) the water temperature
33. 33.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a balloon (c) a battery cell (d) a comb
34. 34.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) ice cold (d) very salty
35. 35.🔍 Which is the odd one out? (a) salt (b) warm water (c) time (d) sugar
36. 36.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of salt (d) a kind of stone
37. 37.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) salt (d) time
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 kept the same. (a) True (b) False
39. 39.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
40. 40.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger

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