Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 995 · 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) dry yeast (b) sugar (c) a small bottle (d) turmeric powder
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) a balloon (d) a small bottle
3. 3.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) it shrinks to nothing (d) the balloon is bigger
4. 4.True or false: sugar is needed for the yeast balloon. (a) True (b) False
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a battery cell (d) a small bottle
6. 6.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to clean floors (d) to wash dishes
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
8. 8.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
9. 9.⚖️ 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 yeast (b) size of the balloon (c) the water temperature (d) the amount of water
10. 10.True or false: a magnet is something yeast does not need. (a) False (b) True
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) put it in your mouth (d) pour it down the sink
12. 12.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
13. 13.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
14. 14.⚖️ 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 sugar (c) the water temperature (d) the amount of yeast
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) a paper clip (d) dry yeast
16. 16.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
17. 17.🍞 Which of these is something yeast needs? (a) warm water (b) a magnet (c) sunlight (d) salt
18. 18.🍞 Which of these is something yeast needs? (a) a magnet (b) sugar (c) sunlight (d) salt
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) a balloon (d) a magnet
20. 20.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it turns to sugar (d) it grows faster
21. 21.⚖️ 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
22. 22.⚖️ 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 measure it (b) we keep it the same (c) we change it
23. 23.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
24. 24.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
25. 25.⚖️ 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) False (b) True
26. 26.🔍 Which is the odd one out? (a) warm water (b) salt (c) sugar (d) time
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) False (b) True
28. 28.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
29. 29.True or false: warm water is something yeast does not need. (a) False (b) True
30. 30.⚖️ 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) False (b) True
31. 31.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
32. 32.🍞 Which of these is something yeast does not need? (a) time (b) vinegar (c) warm water (d) sugar
33. 33.True or false: sunlight is something yeast does not need. (a) False (b) True
34. 34.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a mirror (c) sugar (d) a balloon
36. 36.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) time (d) a magnet
37. 37.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
38. 38.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
39. 39.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
40. 40.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it

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