Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 246 · 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.🧺 Which of these is not needed for the yeast balloon? (a) a battery cell (b) sugar (c) dry yeast (d) warm water
2. 2.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
4. 4.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
5. 5.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
6. 6.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) time (d) sugar
7. 7.⚖️ 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
8. 8.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it grows faster (d) it turns to sugar
9. 9.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
10. 10.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold water is heavy (d) cold kills sugar
11. 11.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) salt (d) sugar
12. 12.⚖️ 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 measure it (b) we change it (c) we keep it the same
13. 13.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
14. 14.🔍 Which is the odd one out? (a) vinegar (b) salt (c) a magnet (d) sugar
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) turmeric powder (d) sugar
16. 16.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to colour it (d) to make it sweet
17. 17.⚖️ 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 change it (b) we measure it (c) we keep it the same
18. 18.⚖️ 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 keep it the same (c) we change it
19. 19.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a kind of salt (d) a tiny living fungus
20. 20.🔍 Which is the odd one out? (a) salt (b) vinegar (c) sunlight (d) warm water
21. 21.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
22. 22.True or false: vinegar is something yeast needs. (a) True (b) False
23. 23.True or false: sugar is something yeast does not need. (a) False (b) True
24. 24.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
25. 25.⚖️ 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) False (b) True
26. 26.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) a balloon (c) a small bottle (d) dry yeast
28. 28.True or false: sugar is something yeast needs. (a) True (b) False
29. 29.True or false: a comb is needed for the yeast balloon. (a) True (b) False
30. 30.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
31. 31.⚖️ 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) False (b) True
32. 32.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it shrinks to nothing (d) it turns to bread
33. 33.⚖️ 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) size of the balloon
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of yeast (b) size of the balloon (c) the water temperature
35. 35.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) a magnet
36. 36.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) vinegar (d) warm water
37. 37.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) sunlight
38. 38.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to colour rice (d) to clean floors
39. 39.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) time (d) a magnet
40. 40.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False

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