Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 438 · 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: vinegar is something yeast does not need. (a) True (b) False
2. 2.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
3. 3.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
4. 4.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) salt
5. 5.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.⚖️ 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 measure it (b) we keep it the same (c) we change it
7. 7.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
8. 8.⚖️ 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 sugar (c) the water temperature
9. 9.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) carbon dioxide gas (d) air from outside
10. 10.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) the balloon is smaller (d) it shrinks to nothing
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a battery cell (c) warm water (d) a balloon
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) a mirror (d) dry yeast
13. 13.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) put it in your mouth (d) throw it at a wall
14. 14.True or false: sugar is something yeast does not need. (a) True (b) False
15. 15.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
16. 16.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a paper clip (c) turmeric powder (d) a mirror
17. 17.⚖️ 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 yeast (b) the same bottles (c) size of the balloon (d) the water temperature
18. 18.⚖️ 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) False (b) True
19. 19.🍞 Which of these is something yeast needs? (a) a magnet (b) time (c) vinegar (d) salt
20. 20.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold water is heavy (d) cold kills sugar
21. 21.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) sunlight (d) warm water
22. 22.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
23. 23.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it grows much faster (d) it turns yellow
24. 24.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
25. 25.⚖️ 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 measure it (b) we change it (c) we keep it the same
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) size of the balloon (b) the same bottles (c) the water temperature
27. 27.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) the yeast is killed (d) it glows
28. 28.⚖️ 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
29. 29.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a balloon (c) a comb (d) sugar
31. 31.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) sugar (c) turmeric powder (d) a small bottle
33. 33.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
34. 34.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) vinegar
35. 35.🔍 Which is the odd one out? (a) salt (b) sunlight (c) time (d) a magnet
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the amount of yeast (c) size of the balloon (d) the water temperature
37. 37.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) warm water (c) a comb (d) a paper clip
38. 38.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
39. 39.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) it is food for yeast (d) to make it sweet
40. 40.⚖️ 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) False (b) True

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