Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 692 · 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) a mirror (b) warm water (c) sugar (d) dry yeast
2. 2.True or false: a magnet is something yeast needs. (a) False (b) True
3. 3.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it turns to bread (d) it shrinks to nothing
4. 4.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
5. 5.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
6. 6.🔍 Which is the odd one out? (a) warm water (b) sugar (c) a magnet (d) time
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) turmeric powder (c) a balloon (d) sugar
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) the water temperature (b) size of the balloon (c) the amount of sugar
9. 9.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a kind of sugar (d) a tiny living fungus
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
11. 11.🔮 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
12. 12.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a mirror (c) a balloon (d) a magnet
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) a battery cell (d) dry yeast
14. 14.🍞 Which of these is something yeast needs? (a) salt (b) sugar (c) sunlight (d) vinegar
15. 15.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
16. 16.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
17. 17.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
18. 18.🔍 Which is the odd one out? (a) time (b) sunlight (c) salt (d) vinegar
19. 19.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) time (d) sugar
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) warm water (c) a balloon (d) dry yeast
21. 21.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of yeast (c) the same bottles (d) the water temperature
23. 23.⚖️ 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
24. 24.⚖️ 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 change it (b) we keep it the same (c) we measure it
25. 25.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
26. 26.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) steam (d) smoke
27. 27.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
28. 28.True or false: sunlight is something yeast does not need. (a) True (b) False
29. 29.⚖️ 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 same bottles (c) the amount of sugar (d) the water temperature
30. 30.True or false: salt is something yeast does not need. (a) False (b) True
31. 31.True or false: sunlight is something yeast needs. (a) True (b) False
32. 32.True or false: sugar is needed for the yeast balloon. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) sugar (b) salt (c) time (d) warm water
34. 34.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🛟 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
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) dry yeast (c) sugar (d) warm water
37. 37.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) to make it sweet (d) it is food for yeast
38. 38.🔍 Which is the odd one out? (a) salt (b) a magnet (c) warm water (d) vinegar
39. 39.True or false: vinegar is something yeast does not need. (a) True (b) False
40. 40.⚖️ 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 water temperature (c) the amount of water

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