Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 252 · 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.⚖️ 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
2. 2.🍞 Which of these is something yeast does not need? (a) time (b) a magnet (c) sugar (d) warm water
3. 3.True or false: sunlight is something yeast needs. (a) False (b) True
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) a balloon (d) turmeric powder
5. 5.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a comb (c) turmeric powder (d) sugar
6. 6.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) turmeric powder (c) a small bottle (d) dry yeast
7. 7.⚖️ 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 water temperature (b) the amount of water (c) the amount of sugar (d) the amount of yeast
8. 8.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
9. 9.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) steam (d) air from outside
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a small bottle (d) a mirror
11. 11.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to clean floors (d) to wash dishes
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
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 same bottles (b) the amount of yeast (c) size of the balloon (d) the water temperature
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a balloon (d) a battery cell
15. 15.⚖️ 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 yeast (b) the water temperature (c) size of the balloon
16. 16.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of stone (d) a kind of salt
18. 18.⚖️ 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 keep it the same (c) we change it
19. 19.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
20. 20.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
21. 21.⚖️ 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) True (b) False
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) a small bottle (d) a balloon
23. 23.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it turns to sugar (d) it grows faster
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.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold slows yeast down (d) cold makes it pink
26. 26.🔍 Which is the odd one out? (a) warm water (b) time (c) salt (d) sugar
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a small bottle (c) sugar (d) a comb
28. 28.⚖️ 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
29. 29.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) time (d) warm water
30. 30.⚖️ 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 keep it the same (b) we change it (c) we measure it
31. 31.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
32. 32.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) put it in your mouth (d) pour it down the sink
33. 33.⚖️ 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
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a magnet (c) a balloon (d) sugar
35. 35.⚖️ 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) True (b) False
36. 36.True or false: sunlight is something yeast does not need. (a) False (b) True
37. 37.🍞 Which of these is something yeast needs? (a) a magnet (b) warm water (c) sunlight (d) vinegar
38. 38.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) a magnet
39. 39.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed

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