Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 846 · 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.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
2. 2.True or false: warm water is something yeast needs. (a) True (b) False
3. 3.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is bigger (d) the balloon is smaller
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
5. 5.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.⚖️ 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
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) turmeric powder (c) a balloon (d) a small bottle
8. 8.⚖️ 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 measure it (b) we change it (c) we keep it the same
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 same bottles (b) the water temperature (c) size of the balloon (d) the amount of water
10. 10.⚖️ 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
11. 11.True or false: a magnet is something yeast needs. (a) False (b) True
12. 12.True or false: vinegar is something yeast does not need. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) salt (b) a magnet (c) vinegar (d) warm water
14. 14.True or false: salt is something yeast does not need. (a) False (b) True
15. 15.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
16. 16.⚖️ 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 measure it (b) we change it (c) we keep it the same
17. 17.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) salt
18. 18.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a magnet (c) warm water (d) sugar
20. 20.⚖️ 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
21. 21.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) time (d) salt
22. 22.⚖️ 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
23. 23.🔍 Which is the odd one out? (a) time (b) warm water (c) vinegar (d) sugar
24. 24.🍞 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
25. 25.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) warm water (c) a balloon (d) a small bottle
26. 26.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) it is food for yeast (d) to make it heavy
27. 27.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
28. 28.⚖️ 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
29. 29.🔍 Which is the odd one out? (a) vinegar (b) salt (c) sugar (d) sunlight
30. 30.⚖️ 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 sugar (b) the water temperature (c) size of the balloon
31. 31.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
32. 32.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a kind of stone (d) a tiny living fungus
33. 33.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a magnet (c) a mirror (d) sugar
34. 34.True or false: sugar is something yeast does not need. (a) True (b) False
35. 35.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it bursts at once (d) it turns yellow
36. 36.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) it glows (d) the yeast is killed
37. 37.True or false: warm water is something yeast does not need. (a) False (b) True
38. 38.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) True (b) False

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