Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 271 · 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 something yeast does not need? (a) salt (b) time (c) sugar (d) warm water
2. 2.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
3. 3.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
4. 4.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
5. 5.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) throw it at a wall (d) keep it for a month
6. 6.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) salt (d) sugar
7. 7.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
8. 8.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) salt (b) sugar (c) time (d) warm water
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a mirror (c) warm water (d) a small bottle
11. 11.⚖️ 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 measure it (c) we change it
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 change it (b) we keep it the same (c) we measure it
13. 13.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
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 kept the same. (a) False (b) True
15. 15.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) sugar (c) a mirror (d) turmeric powder
16. 16.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a comb (c) a small bottle (d) a battery cell
17. 17.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a magnet (d) warm water
19. 19.⚖️ 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 water (b) the amount of sugar (c) the water temperature (d) the amount of yeast
20. 20.🍞 Which of these is something yeast needs? (a) warm water (b) salt (c) vinegar (d) a magnet
21. 21.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a tiny living fungus (d) a kind of stone
22. 22.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) time (d) sunlight
23. 23.True or false: warm water is something yeast needs. (a) False (b) True
24. 24.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True
25. 25.⚖️ 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
26. 26.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
27. 27.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) turmeric powder (d) a magnet
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) turmeric powder (c) sugar (d) dry yeast
30. 30.⚖️ 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 keep it the same (b) we change it (c) we measure it
31. 31.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to make bread rise (c) to wash dishes (d) to clean floors
32. 32.True or false: a magnet is something yeast does not need. (a) False (b) True
33. 33.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False
34. 34.True or false: sugar is something yeast needs. (a) True (b) False
35. 35.True or false: vinegar is something yeast needs. (a) True (b) False
36. 36.True or false: sunlight is something yeast does not need. (a) False (b) True
37. 37.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
38. 38.🍞 Which of these is something yeast needs? (a) a magnet (b) time (c) vinegar (d) salt
39. 39.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) warm water (d) salt
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of yeast (b) the amount of water (c) size of the balloon (d) the same bottles

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