Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 54 · 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) turmeric powder (b) dry yeast (c) a balloon (d) warm water
2. 2.True or false: sugar is something yeast does not need. (a) False (b) True
3. 3.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
4. 4.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) the yeast is killed (d) it grows faster
5. 5.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) sunlight (d) sugar
6. 6.🔮 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
7. 7.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
8. 8.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
9. 9.⚖️ 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) False (b) True
10. 10.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) keep it for a month (d) pour it down the sink
11. 11.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a small bottle (c) a magnet (d) a mirror
13. 13.🍞 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
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) dry yeast (d) turmeric powder
15. 15.True or false: salt is something yeast needs. (a) True (b) False
16. 16.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
17. 17.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to colour rice (d) to make bread rise
18. 18.⚖️ 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 amount of water (c) the water temperature (d) the amount of sugar
19. 19.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of salt (d) a kind of sugar
20. 20.🍞 Which of these is something yeast does not need? (a) a magnet (b) warm water (c) sugar (d) time
21. 21.⚖️ 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 yeast
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a magnet (d) warm water
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) warm water (d) a mirror
24. 24.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
25. 25.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it grows much faster (d) it bursts at once
26. 26.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
27. 27.🔍 Which is the odd one out? (a) sugar (b) salt (c) warm water (d) time
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) a balloon (d) a comb
29. 29.🔍 Which is the odd one out? (a) salt (b) a magnet (c) sugar (d) sunlight
30. 30.⚖️ 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
31. 31.⚖️ 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
32. 32.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a battery cell (c) turmeric powder (d) a magnet
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) dry yeast (d) a comb
34. 34.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
35. 35.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
36. 36.True or false: warm water is needed for the yeast balloon. (a) True (b) False
37. 37.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
38. 38.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) time (d) sunlight
40. 40.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False

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