Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 199 · 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.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) throw it at a wall (d) put it in your mouth
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) dry yeast (c) sugar (d) a small bottle
3. 3.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) sunlight
4. 4.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
5. 5.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
7. 7.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) the yeast is killed (d) it glows
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 water temperature (c) the same bottles
9. 9.⚖️ 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
10. 10.True or false: time is something yeast does not need. (a) False (b) True
11. 11.True or false: vinegar is something yeast needs. (a) False (b) True
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) sugar (c) a magnet (d) turmeric powder
13. 13.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) time (d) sugar
14. 14.⚖️ 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) True (b) False
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a paper clip (c) a balloon (d) sugar
16. 16.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
17. 17.⚖️ 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) True (b) False
18. 18.⚖️ 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
19. 19.⚖️ 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 keep it the same (b) we change it (c) we measure it
20. 20.🍞 Which of these is something yeast does not need? (a) time (b) a magnet (c) sugar (d) warm water
21. 21.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) time (b) vinegar (c) warm water (d) sugar
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) dry yeast (d) a battery cell
24. 24.⚖️ 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 measure it (b) we keep it the same (c) we change it
25. 25.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
26. 26.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.⚖️ 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 same bottles (b) the amount of sugar (c) the amount of water (d) the water temperature
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a magnet (c) warm water (d) dry yeast
29. 29.⚖️ 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 change it (b) we measure it (c) we keep it the same
30. 30.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
31. 31.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) a magnet (d) sunlight
32. 32.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) salt (d) sunlight
33. 33.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
34. 34.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) it shrinks to nothing (d) the balloon is bigger
35. 35.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
36. 36.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) air from outside (d) carbon dioxide gas
37. 37.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) it is food for yeast (d) to make it heavy
38. 38.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
39. 39.True or false: warm water is something yeast does not need. (a) False (b) True
40. 40.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True

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