Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 355 · 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.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a magnet (d) sugar
3. 3.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) a magnet
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) warm water (c) a battery cell (d) a paper clip
5. 5.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) sugar (d) sunlight
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a paper clip (c) sugar (d) a balloon
7. 7.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it turns yellow (d) it grows much faster
8. 8.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) warm water (d) time
9. 9.🔮 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
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) sugar (c) a small bottle (d) dry yeast
11. 11.⚖️ 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 water
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) True (b) False
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a balloon (d) a battery cell
14. 14.⚖️ 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) False (b) True
15. 15.True or false: warm water is needed for the yeast balloon. (a) False (b) True
16. 16.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) turmeric powder (d) dry yeast
17. 17.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) salt
18. 18.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
19. 19.True or false: time is something yeast needs. (a) True (b) False
20. 20.⚖️ 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) True (b) False
21. 21.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
22. 22.⚖️ 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 amount of water (c) the water temperature
23. 23.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
24. 24.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
25. 25.True or false: warm water is something yeast does not need. (a) True (b) False
26. 26.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) it is food for yeast (d) to make it heavy
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 sugar”? (a) we measure it (b) we change it (c) we keep it the same
28. 28.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.🔮 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
30. 30.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
31. 31.⚖️ 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 sugar
32. 32.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) time (d) sugar
33. 33.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) boiling hot (d) ice cold
34. 34.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) a balloon (c) warm water (d) a small bottle
35. 35.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to clean floors (d) to wash dishes
36. 36.True or false: sugar is something yeast does not need. (a) True (b) False
37. 37.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
38. 38.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
39. 39.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) a battery cell (d) sugar
40. 40.True or false: sunlight is something yeast does not need. (a) True (b) False

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