Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 768 · 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) ice cold (c) boiling hot (d) warm, not hot
2. 2.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) warm water (d) turmeric powder
3. 3.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
4. 4.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
5. 5.True or false: warm water is something yeast needs. (a) False (b) True
6. 6.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
7. 7.🍞 Which of these is something yeast needs? (a) sunlight (b) warm water (c) salt (d) a magnet
8. 8.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
9. 9.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) smoke (c) carbon dioxide gas (d) air from outside
10. 10.⚖️ 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) False (b) True
11. 11.⚖️ 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
12. 12.⚖️ 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
13. 13.🔮 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
14. 14.⚖️ 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
15. 15.⚖️ 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 measure it (c) we change it
16. 16.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) keep it for a month (d) throw it at a wall
17. 17.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
18. 18.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
19. 19.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a mirror (c) a battery cell (d) turmeric powder
20. 20.⚖️ 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 measure it (c) we change it
21. 21.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to make bread rise (c) to colour rice (d) to clean floors
22. 22.True or false: salt is something yeast needs. (a) True (b) False
23. 23.True or false: warm water is something yeast does not need. (a) True (b) False
24. 24.🍞 Which of these is something yeast needs? (a) time (b) vinegar (c) salt (d) a magnet
25. 25.⚖️ 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
26. 26.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
27. 27.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a magnet (d) dry yeast
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 same bottles (b) the water temperature (c) size of the balloon (d) the amount of sugar
30. 30.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to make it heavy (d) to colour it
31. 31.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a tiny living fungus (d) a kind of sugar
32. 32.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
33. 33.⚖️ 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
34. 34.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) False (b) True
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.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
38. 38.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
39. 39.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
40. 40.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it

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