Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 952 · 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 needed for the yeast balloon. (a) True (b) False
2. 2.⚖️ 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 change it (b) we measure it (c) we keep it the same
3. 3.True or false: warm water is something yeast needs. (a) False (b) True
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) turmeric powder (c) sugar (d) a mirror
5. 5.🍞 Which of these is something yeast needs? (a) sunlight (b) sugar (c) salt (d) a magnet
6. 6.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
7. 7.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
8. 8.⚖️ 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 change it (b) we measure it (c) we keep it the same
9. 9.True or false: sunlight is something yeast does not need. (a) False (b) True
10. 10.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
11. 11.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) sugar (d) a small bottle
13. 13.🔍 Which is the odd one out? (a) sugar (b) warm water (c) sunlight (d) time
14. 14.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
16. 16.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
17. 17.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
18. 18.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it bursts at once (d) it grows very little
19. 19.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold slows yeast down (d) cold water is heavy
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) warm water (c) dry yeast (d) a small bottle
21. 21.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it shrinks to nothing (d) it turns to bread
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the same bottles (b) size of the balloon (c) the water temperature
23. 23.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we measure it (b) we change it (c) we keep it the same
25. 25.⚖️ 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) False (b) True
26. 26.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) turmeric powder (c) sugar (d) a balloon
28. 28.⚖️ 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) False (b) True
29. 29.⚖️ 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 yeast (b) the water temperature (c) size of the balloon (d) the amount of water
30. 30.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) salt
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) True (b) False
32. 32.🍞 Which of these is something yeast does not need? (a) sugar (b) salt (c) time (d) warm water
33. 33.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) salt (d) sugar
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) dry yeast (d) turmeric powder
35. 35.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a tiny living fungus (d) a kind of sugar
36. 36.⚖️ 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
37. 37.⚖️ 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 amount of sugar
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) sugar (d) a comb
39. 39.True or false: a mirror is not needed for the yeast balloon. (a) False (b) True
40. 40.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) vinegar (d) warm water

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