Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 607 · 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) a balloon (b) a mirror (c) sugar (d) warm water
2. 2.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) to colour it (d) it is food for yeast
3. 3.True or false: sugar is something yeast does not need. (a) True (b) False
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a mirror (c) dry yeast (d) warm water
5. 5.True or false: a comb is needed for the yeast balloon. (a) True (b) False
6. 6.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
7. 7.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) the yeast is killed (d) it glows
8. 8.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
9. 9.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) a balloon (d) a magnet
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) dry yeast (c) sugar (d) a small bottle
11. 11.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a battery cell (c) a paper clip (d) turmeric powder
12. 12.⚖️ 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
13. 13.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
14. 14.🔮 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
15. 15.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) time (d) vinegar
16. 16.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of salt (d) a kind of sugar
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) turmeric powder (c) a small bottle (d) a balloon
18. 18.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
19. 19.🍞 Which of these is something yeast does not need? (a) time (b) vinegar (c) warm water (d) sugar
20. 20.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
21. 21.⚖️ 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 amount of water (c) the amount of yeast (d) the water temperature
22. 22.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
23. 23.⚖️ 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) True (b) False
24. 24.⚖️ 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 keep it the same (b) we measure it (c) we change it
25. 25.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) keep it for a month (d) throw it at a wall
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) True (b) False
27. 27.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
28. 28.⚖️ 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 change it (c) we keep it the same
29. 29.⚖️ 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
30. 30.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) vinegar (b) sugar (c) sunlight (d) salt
32. 32.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to wash dishes (d) to clean floors
33. 33.True or false: sunlight is something yeast does not need. (a) True (b) False
34. 34.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) sugar (d) warm water
35. 35.⚖️ 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 change it (b) we keep it the same (c) we measure it
36. 36.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) vinegar (d) a magnet
37. 37.True or false: salt is something yeast needs. (a) False (b) True
38. 38.True or false: sugar is something yeast needs. (a) False (b) True
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) a paper clip (d) sugar
40. 40.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it

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