Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 972 · 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) boiling hot (b) warm, not hot (c) very salty (d) ice cold
2. 2.⚖️ 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
3. 3.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
4. 4.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
5. 5.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
6. 6.True or false: sunlight is something yeast needs. (a) True (b) False
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a small bottle (d) turmeric powder
8. 8.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
9. 9.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
10. 10.⚖️ 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 keep it the same (b) we change it (c) we measure it
11. 11.⚖️ 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 measure it (b) we change it (c) we keep it the same
12. 12.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) the yeast is killed (c) it grows faster (d) it glows
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) smoke (d) steam
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) turmeric powder (c) a comb (d) dry yeast
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a comb (c) dry yeast (d) sugar
16. 16.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
18. 18.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) turmeric powder (d) a small bottle
20. 20.⚖️ 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 change it (b) we keep it the same (c) we measure it
21. 21.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) dry yeast (c) a balloon (d) a small bottle
23. 23.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a comb (c) a paper clip (d) sugar
24. 24.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
25. 25.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows very little (d) it grows much faster
26. 26.🔍 Which is the odd one out? (a) a magnet (b) salt (c) warm water (d) vinegar
27. 27.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) sunlight
28. 28.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
29. 29.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) salt
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) warm water (d) a magnet
31. 31.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
32. 32.🍞 Which of these is something yeast needs? (a) salt (b) vinegar (c) a magnet (d) warm water
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) sugar (d) a battery cell
34. 34.⚖️ 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) size of the balloon (b) the amount of sugar (c) the same bottles (d) the water temperature
35. 35.True or false: vinegar is something yeast needs. (a) True (b) False
36. 36.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
37. 37.⚖️ 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
38. 38.True or false: salt is something yeast does not need. (a) False (b) True
39. 39.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) warm water (c) a battery cell (d) a magnet
40. 40.⚖️ 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

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