Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 106 · 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 needs? (a) sugar (b) sunlight (c) vinegar (d) salt
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a small bottle (d) turmeric powder
3. 3.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to clean floors (d) to wash dishes
4. 4.⚖️ 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) size of the balloon (b) the water temperature (c) the amount of sugar (d) the amount of yeast
5. 5.🔍 Which is the odd one out? (a) salt (b) a magnet (c) vinegar (d) sugar
6. 6.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a comb (d) a small bottle
7. 7.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it turns yellow (d) it bursts at once
8. 8.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
9. 9.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) False (b) True
11. 11.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
12. 12.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
14. 14.⚖️ 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) True (b) False
15. 15.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
16. 16.🔍 Which is the odd one out? (a) vinegar (b) salt (c) sunlight (d) warm water
17. 17.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
18. 18.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) sugar (d) a small bottle
20. 20.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) to make it heavy (d) it is food for yeast
21. 21.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
22. 22.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a tiny living fungus (d) a kind of sugar
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
24. 24.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
25. 25.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) a balloon (d) a paper clip
26. 26.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.True or false: sunlight is something yeast needs. (a) True (b) False
28. 28.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) sugar (d) time
29. 29.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) it turns to bread (d) the balloon is smaller
30. 30.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) smoke (d) air from outside
31. 31.🧺 Do we need sugar 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? True or false: size of the balloon is kept the same. (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 amount of sugar”? (a) we keep it the same (b) we change it (c) we measure it
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a magnet (c) sugar (d) dry yeast
35. 35.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) sugar (b) time (c) sunlight (d) warm water
37. 37.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) salt
38. 38.True or false: vinegar is something yeast does not need. (a) False (b) True
39. 39.⚖️ 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
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) a balloon (c) warm water (d) sugar

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