Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 231 · 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 comb (b) warm water (c) dry yeast (d) a balloon
2. 2.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
3. 3.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) steam (d) smoke
4. 4.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
5. 5.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
6. 6.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) boiling hot (d) very salty
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) turmeric powder (c) a small bottle (d) dry yeast
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the amount of yeast (c) size of the balloon (d) the same bottles
10. 10.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) a magnet (d) a small bottle
12. 12.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) sunlight
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a small bottle (c) a battery cell (d) warm water
14. 14.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a small bottle (d) a mirror
16. 16.⚖️ 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 keep it the same (c) we measure it
17. 17.⚖️ 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 yeast
18. 18.⚖️ 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 change it (b) we keep it the same (c) we measure it
19. 19.⚖️ 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) False (b) True
20. 20.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
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 amount of water (c) the water temperature
22. 22.🔍 Which is the odd one out? (a) vinegar (b) time (c) sugar (d) warm water
23. 23.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
25. 25.True or false: salt is something yeast needs. (a) False (b) True
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) sugar (d) a battery cell
27. 27.⚖️ 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) True (b) False
28. 28.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
29. 29.⚖️ 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 amount of yeast (b) the amount of water (c) the water temperature (d) the amount of sugar
30. 30.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
31. 31.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
32. 32.🍞 Which of these is something yeast needs? (a) vinegar (b) time (c) a magnet (d) sunlight
33. 33.True or false: vinegar is something yeast needs. (a) True (b) False
34. 34.True or false: sunlight is something yeast needs. (a) False (b) True
35. 35.🔮 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
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a small bottle (c) turmeric powder (d) dry yeast
37. 37.True or false: warm water is something yeast needs. (a) False (b) True
38. 38.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
39. 39.True or false: a magnet is something yeast does not need. (a) False (b) True
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) sugar (c) dry yeast (d) warm water

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