Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 341 · 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) dry yeast (b) a balloon (c) a magnet (d) warm water
2. 2.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) it grows faster (d) the yeast is killed
3. 3.🔍 Which is the odd one out? (a) a magnet (b) salt (c) warm water (d) vinegar
4. 4.True or false: salt is something yeast does not need. (a) False (b) True
5. 5.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
6. 6.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
7. 7.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) the balloon is smaller (d) it turns to bread
8. 8.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) False (b) True
10. 10.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a paper clip (c) a comb (d) dry yeast
11. 11.⚖️ 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
12. 12.⚖️ 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
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) sugar (d) turmeric powder
14. 14.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
15. 15.⚖️ 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 same bottles
16. 16.True or false: salt is something yeast needs. (a) True (b) False
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) warm water (d) a mirror
18. 18.⚖️ 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) False (b) True
19. 19.⚖️ 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 sugar (b) the amount of yeast (c) the amount of water (d) size of the balloon
20. 20.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a battery cell (c) a paper clip (d) a magnet
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a battery cell (c) sugar (d) warm water
23. 23.⚖️ 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 keep it the same (c) we measure it
24. 24.True or false: warm water is something yeast does not need. (a) True (b) False
25. 25.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
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 the one thing we change. (a) False (b) True
27. 27.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
28. 28.⚖️ 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
29. 29.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
30. 30.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) warm water (d) a battery cell
31. 31.⚖️ 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) False (b) True
32. 32.True or false: warm water is needed for the yeast balloon. (a) False (b) True
33. 33.True or false: sugar is needed for the yeast balloon. (a) False (b) True
34. 34.True or false: time is something yeast needs. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) a magnet (b) sugar (c) time (d) warm water
36. 36.🔍 Which is the odd one out? (a) warm water (b) sugar (c) sunlight (d) time
37. 37.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) pour it down the sink (d) throw it at a wall
38. 38.True or false: a battery cell is needed for the yeast balloon. (a) False (b) True
39. 39.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
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 kept the same. (a) True (b) False

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