Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 319 · 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) ice cold (b) very salty (c) boiling hot (d) warm, not hot
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a magnet (c) a balloon (d) dry yeast
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a small bottle (c) warm water (d) a mirror
4. 4.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) sugar (d) a magnet
5. 5.⚖️ 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
6. 6.⚖️ 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 water temperature (c) the amount of water (d) the same bottles
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) a comb (d) warm water
8. 8.⚖️ 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
9. 9.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a comb (d) sugar
11. 11.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is bigger (d) the balloon is smaller
12. 12.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) steam (c) smoke (d) air from outside
14. 14.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
15. 15.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
16. 16.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) it is food for yeast (c) to colour it (d) to make it sweet
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 sugar”? (a) we measure it (b) we keep it the same (c) we change it
18. 18.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
19. 19.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it turns yellow (d) it grows much faster
20. 20.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a battery cell (c) a paper clip (d) turmeric powder
21. 21.True or false: a magnet is something yeast does not need. (a) True (b) False
22. 22.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) turmeric powder (c) a comb (d) sugar
23. 23.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
24. 24.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a mirror (c) a paper clip (d) a comb
25. 25.⚖️ 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
26. 26.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
27. 27.⚖️ 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
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) sunlight (b) warm water (c) sugar (d) time
30. 30.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
31. 31.True or false: vinegar is something yeast does not need. (a) False (b) True
32. 32.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
33. 33.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) it glows (d) the yeast is killed
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of water (c) the amount of sugar (d) the water temperature
35. 35.⚖️ 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 measure it (b) we keep it the same (c) we change it
36. 36.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) time (d) salt
37. 37.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) put it in your mouth (d) keep it for a month
38. 38.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
39. 39.🔍 Which is the odd one out? (a) warm water (b) sugar (c) a magnet (d) time
40. 40.⚖️ 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

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