Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 673 · 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.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) the yeast is killed (d) it grows faster
2. 2.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) it is food for yeast (d) to make it heavy
3. 3.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) dry yeast (c) a balloon (d) sugar
5. 5.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) vinegar (d) time
6. 6.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
7. 7.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
8. 8.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) throw it at a wall (d) pour it down the sink
9. 9.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a mirror (c) sugar (d) a small bottle
11. 11.⚖️ 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 sugar (b) the water temperature (c) size of the balloon (d) the same bottles
12. 12.🔍 Which is the odd one out? (a) vinegar (b) time (c) sunlight (d) a magnet
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) air from outside (d) carbon dioxide gas
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a battery cell (c) dry yeast (d) a magnet
15. 15.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) salt (d) time
16. 16.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
18. 18.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) turmeric powder (c) a balloon (d) a small bottle
19. 19.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
20. 20.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
21. 21.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
22. 22.True or false: vinegar is something yeast needs. (a) False (b) True
23. 23.⚖️ 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
24. 24.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it grows very little (d) it turns yellow
25. 25.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) a magnet
26. 26.⚖️ 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 yeast (b) the water temperature (c) size of the balloon
27. 27.True or false: sugar is something yeast needs. (a) True (b) False
28. 28.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a battery cell (c) a mirror (d) sugar
29. 29.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) warm water (d) salt
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 keep it the same (c) we measure it
31. 31.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.⚖️ 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 water
33. 33.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
35. 35.True or false: salt is something yeast does not need. (a) False (b) True
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) sugar (c) a small bottle (d) a balloon
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a mirror (c) sugar (d) a balloon
38. 38.⚖️ 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 change it (c) we measure it
39. 39.True or false: salt is something yeast needs. (a) False (b) True
40. 40.True or false: warm water is not needed for the yeast balloon. (a) True (b) False

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