Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 877 · 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.True or false: vinegar is something yeast does not need. (a) False (b) True
2. 2.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
3. 3.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it bursts at once (d) it turns yellow
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a battery cell (d) sugar
5. 5.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) it turns to sugar (d) the yeast is killed
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 kept the same. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) warm water (b) salt (c) vinegar (d) a magnet
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the same bottles (c) the water temperature
9. 9.🛟 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
10. 10.⚖️ 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
11. 11.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) salt
12. 12.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) to make it heavy (d) it is food for yeast
13. 13.True or false: warm water is something yeast does not need. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) salt (b) sunlight (c) vinegar (d) time
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) a magnet (d) dry yeast
16. 16.True or false: warm water is something yeast needs. (a) False (b) True
17. 17.⚖️ 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) False (b) True
18. 18.🍞 Which of these is something yeast needs? (a) a magnet (b) sugar (c) salt (d) sunlight
19. 19.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
20. 20.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to clean floors (d) to wash dishes
21. 21.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a comb (d) a balloon
23. 23.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
24. 24.True or false: salt is something yeast needs. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) vinegar
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) False (b) True
27. 27.⚖️ 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 change it (b) we measure it (c) we keep it the same
28. 28.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
29. 29.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of sugar (d) a kind of salt
30. 30.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
31. 31.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) the balloon is smaller (d) it turns to bread
32. 32.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) salt (d) a magnet
34. 34.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) ice cold (d) very salty
35. 35.True or false: sunlight is something yeast needs. (a) False (b) True
36. 36.⚖️ 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 measure it (c) we keep it the same
37. 37.⚖️ 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 water temperature (b) the same bottles (c) the amount of sugar (d) the amount of yeast
38. 38.⚖️ 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) False (b) True
39. 39.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) warm water (d) a mirror

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