Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 419 · 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.⚖️ 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
2. 2.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
4. 4.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) time (d) warm water
5. 5.True or false: a comb is needed for the yeast balloon. (a) False (b) True
6. 6.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) sunlight (d) time
7. 7.⚖️ 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 water (b) size of the balloon (c) the amount of yeast (d) the same bottles
8. 8.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) sunlight
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) dry yeast (c) warm water (d) sugar
10. 10.⚖️ 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
11. 11.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it turns yellow (d) it grows very little
13. 13.⚖️ 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) True (b) False
14. 14.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
15. 15.True or false: time is something yeast needs. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) sunlight (b) sugar (c) a magnet (d) vinegar
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a mirror (b) a balloon (c) dry yeast (d) a small bottle
18. 18.⚖️ 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) False (b) True
19. 19.🛟 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
20. 20.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
21. 21.⚖️ 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 keep it the same (b) we measure it (c) we change it
22. 22.🍞 Which of these is something yeast needs? (a) sugar (b) salt (c) sunlight (d) a magnet
23. 23.True or false: vinegar is something yeast needs. (a) False (b) True
24. 24.⚖️ 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 water temperature (b) size of the balloon (c) the amount of water (d) the amount of yeast
25. 25.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
26. 26.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
27. 27.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) time (d) salt
30. 30.⚖️ 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 keep it the same (b) we measure it (c) we change it
31. 31.⚖️ 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
32. 32.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) a comb (d) warm water
33. 33.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
34. 34.⚖️ 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 measure it (c) we keep it the same
35. 35.True or false: sugar is something yeast does not need. (a) True (b) False
36. 36.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
37. 37.True or false: vinegar is something yeast does not need. (a) False (b) True
38. 38.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to colour it (c) it is food for yeast (d) to make it heavy
39. 39.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) salt
40. 40.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a paper clip (c) a comb (d) a balloon

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