Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 153 · 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) very salty (b) warm, not hot (c) ice cold (d) boiling hot
2. 2.⚖️ 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
3. 3.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
4. 4.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
5. 5.True or false: sunlight is something yeast needs. (a) False (b) True
6. 6.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) turmeric powder (c) a mirror (d) sugar
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) True (b) False
8. 8.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
9. 9.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows much faster (d) it grows very little
10. 10.🧺 Do we need a balloon 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 kept the same? (a) the amount of water (b) size of the balloon (c) the water temperature
12. 12.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a battery cell (c) a paper clip (d) a magnet
13. 13.⚖️ 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 same bottles (d) the water temperature
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) dry yeast (d) turmeric powder
15. 15.⚖️ 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 water (b) the same bottles (c) size of the balloon (d) the water temperature
16. 16.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
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 water”? (a) we change it (b) we measure it (c) we keep it the same
18. 18.🍞 Which of these is something yeast needs? (a) salt (b) warm water (c) sunlight (d) a magnet
19. 19.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) put it in your mouth (d) pour it down the sink
20. 20.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a tiny living fungus (d) a kind of salt
21. 21.⚖️ 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
22. 22.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
23. 23.🍞 Which of these is something yeast does not need? (a) warm water (b) salt (c) sugar (d) time
24. 24.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) warm water (d) a mirror
25. 25.True or false: a comb is needed for the yeast balloon. (a) True (b) False
26. 26.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
27. 27.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) a battery cell (d) a balloon
28. 28.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) a magnet (d) sugar
29. 29.⚖️ 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
30. 30.⚖️ 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
31. 31.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) dry yeast (d) sugar
33. 33.🔍 Which is the odd one out? (a) salt (b) vinegar (c) warm water (d) sunlight
34. 34.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) the balloon is bigger (d) it turns to bread
35. 35.True or false: sugar is needed for the yeast balloon. (a) False (b) True
36. 36.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
37. 37.⚖️ 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
38. 38.True or false: sugar is something yeast does not need. (a) True (b) False
39. 39.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold makes it pink (d) cold slows yeast down
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) True (b) False

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