Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 770 · 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 is the odd one out? (a) vinegar (b) warm water (c) sugar (d) time
2. 2.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
3. 3.🍞 Which of these is something yeast needs? (a) a magnet (b) sugar (c) sunlight (d) salt
4. 4.🛟 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
5. 5.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
6. 6.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) warm water (d) sunlight
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) sugar (c) warm water (d) turmeric powder
8. 8.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) the balloon is smaller (d) it turns to bread
9. 9.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
10. 10.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it turns to sugar (d) it grows faster
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) sugar (c) a small bottle (d) dry yeast
12. 12.True or false: time is something yeast needs. (a) False (b) True
13. 13.🔮 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
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) False (b) True
15. 15.⚖️ 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) False (b) True
16. 16.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a tiny living fungus (d) a kind of salt
17. 17.True or false: sugar is something yeast needs. (a) False (b) True
18. 18.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
19. 19.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
20. 20.⚖️ 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
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) the water temperature (b) size of the balloon (c) the amount of water
22. 22.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
23. 23.⚖️ 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 measure it (b) we keep it the same (c) we change it
24. 24.⚖️ 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
25. 25.⚖️ 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 keep it the same (b) we measure it (c) we change it
26. 26.True or false: warm water is something yeast does not need. (a) True (b) False
27. 27.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) a battery cell (d) sugar
28. 28.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
29. 29.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) True (b) False
31. 31.⚖️ 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 amount of sugar (c) the water temperature
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the amount of water (c) the amount of sugar (d) size of the balloon
33. 33.⚖️ 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
34. 34.True or false: warm water is something yeast needs. (a) True (b) False
35. 35.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) a paper clip (d) a small bottle
37. 37.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) vinegar (d) time
39. 39.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) a balloon (d) a battery cell
40. 40.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False

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