Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 684 · 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.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
2. 2.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) keep it for a month (d) put it in your mouth
3. 3.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) a magnet (d) warm water
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) sugar (d) a magnet
5. 5.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a magnet (c) a paper clip (d) a comb
6. 6.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
7. 7.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) ice cold (d) warm, not hot
8. 8.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
9. 9.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it grows faster (d) it glows
10. 10.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
11. 11.⚖️ 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 water temperature (c) the amount of yeast (d) size of the balloon
12. 12.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) turmeric powder (d) warm water
14. 14.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
15. 15.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of sugar”? (a) we keep it the same (b) we measure it (c) we change it
16. 16.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
17. 17.⚖️ 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 change it (c) we measure it
18. 18.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
19. 19.True or false: a magnet is something yeast needs. (a) True (b) False
20. 20.⚖️ 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
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a mirror (c) sugar (d) a small bottle
22. 22.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
23. 23.True or false: time is something yeast needs. (a) True (b) False
24. 24.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it grows much faster (d) it bursts at once
25. 25.🔍 Which is the odd one out? (a) vinegar (b) time (c) a magnet (d) salt
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a magnet (d) warm water
27. 27.True or false: vinegar is something yeast needs. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) vinegar (b) time (c) warm water (d) sugar
29. 29.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a magnet (c) a mirror (d) turmeric powder
30. 30.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) warm water (d) a comb
31. 31.⚖️ 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
32. 32.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) it shrinks to nothing (d) the balloon is smaller
33. 33.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) it is food for yeast (d) to make it sweet
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) the amount of sugar (b) the amount of yeast (c) size of the balloon (d) the water temperature
35. 35.⚖️ 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
36. 36.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
37. 37.⚖️ 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
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) sugar (d) a comb
39. 39.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it

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