Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 557 · 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: sugar is something yeast does not need. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) vinegar (d) salt
3. 3.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) sunlight
4. 4.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
5. 5.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.⚖️ 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
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) a comb (d) dry yeast
8. 8.🔍 Which is the odd one out? (a) warm water (b) sugar (c) a magnet (d) time
9. 9.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) throw it at a wall (d) put it in your mouth
10. 10.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) vinegar
11. 11.⚖️ 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
12. 12.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
13. 13.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
14. 14.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.True or false: sunlight is something yeast does not need. (a) True (b) False
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a balloon (d) a comb
17. 17.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
18. 18.⚖️ 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
19. 19.⚖️ 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 keep it the same (b) we measure it (c) we change it
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 the one thing we change. (a) True (b) False
21. 21.True or false: vinegar is something yeast needs. (a) True (b) False
22. 22.🍞 Which of these is something yeast does not need? (a) sugar (b) a magnet (c) time (d) warm water
23. 23.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) to colour it (d) it is food for yeast
24. 24.⚖️ 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 amount of yeast (c) the same bottles (d) the amount of sugar
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True
26. 26.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold slows yeast down (d) cold water is heavy
27. 27.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) boiling hot (d) very salty
28. 28.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
29. 29.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a mirror (d) a small bottle
31. 31.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
32. 32.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a magnet (c) dry yeast (d) warm water
34. 34.⚖️ 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 same bottles (c) the amount of water (d) the amount of yeast
35. 35.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
36. 36.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) the yeast is killed (d) it turns to sugar
37. 37.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to wash dishes (d) to make bread rise
38. 38.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
39. 39.True or false: a balloon 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) dry yeast (c) sugar (d) a battery cell

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