Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 528 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a mirror (c) sugar (d) warm water
2. 2.⚖️ 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
3. 3.⚖️ 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
4. 4.True or false: time is something yeast needs. (a) False (b) True
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) warm water (c) a balloon (d) sugar
6. 6.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
7. 7.True or false: time is something yeast does not need. (a) True (b) False
8. 8.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) salt (d) sugar
9. 9.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) boiling hot (d) very salty
10. 10.⚖️ 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 amount of yeast (c) the same bottles (d) the water temperature
11. 11.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
12. 12.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) sunlight (d) warm water
13. 13.⚖️ 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 yeast
14. 14.⚖️ 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
15. 15.True or false: sugar is something yeast does not need. (a) True (b) False
16. 16.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to wash dishes (d) to colour rice
17. 17.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it grows faster (d) it glows
18. 18.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
19. 19.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
20. 20.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) carbon dioxide gas (d) air from outside
21. 21.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a tiny living fungus (d) a kind of sugar
22. 22.🍞 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
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a mirror (d) sugar
24. 24.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) salt (d) time
25. 25.⚖️ 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
26. 26.⚖️ 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) False (b) True
27. 27.🛟 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
28. 28.🍞 Which of these is something yeast does not need? (a) vinegar (b) sugar (c) warm water (d) time
29. 29.⚖️ 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 water temperature (c) the amount of sugar
30. 30.True or false: a battery cell is not needed for the yeast balloon. (a) True (b) False
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a magnet (c) a small bottle (d) sugar
32. 32.⚖️ 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) the same bottles (c) size of the balloon
33. 33.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) to make it sweet (d) it is food for yeast
35. 35.⚖️ 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 water temperature (c) the amount of water
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) a small bottle (c) dry yeast (d) a balloon
37. 37.🔍 Which is the odd one out? (a) salt (b) a magnet (c) sugar (d) vinegar
38. 38.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a mirror (c) a comb (d) turmeric powder
39. 39.🔍 Which is the odd one out? (a) time (b) warm water (c) a magnet (d) sugar
40. 40.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it

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