Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 747 · 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.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) a magnet
2. 2.⚖️ 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
3. 3.⚖️ 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 water (c) size of the balloon (d) the amount of sugar
4. 4.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) a balloon (c) a small bottle (d) warm water
6. 6.⚖️ 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
7. 7.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
8. 8.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) sunlight (d) warm water
9. 9.⚖️ 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 sugar (c) the amount of yeast (d) size of the balloon
10. 10.True or false: time is something yeast needs. (a) False (b) True
11. 11.⚖️ 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
12. 12.⚖️ 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
13. 13.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) salt (d) time
14. 14.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to make bread rise (d) to colour rice
15. 15.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) turmeric powder (d) dry yeast
17. 17.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) time (d) sunlight
18. 18.True or false: a small bottle is not needed for the yeast balloon. (a) False (b) True
19. 19.🛟 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
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) sugar (c) warm water (d) a small bottle
21. 21.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
22. 22.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) steam (d) air from outside
23. 23.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) it is food for yeast (d) to make it heavy
24. 24.🍞 Which of these is something yeast needs? (a) sugar (b) vinegar (c) a magnet (d) sunlight
25. 25.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) sugar (d) a mirror
27. 27.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a tiny living fungus (d) a kind of stone
28. 28.🧺 Which of these is not needed for the yeast balloon? (a) a comb (b) a balloon (c) a small bottle (d) dry yeast
29. 29.🔮 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
30. 30.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
31. 31.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) the yeast is killed (d) it grows faster
32. 32.True or false: sunlight is something yeast does not need. (a) False (b) True
33. 33.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
34. 34.⚖️ 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
35. 35.🔮 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
36. 36.True or false: warm water is something yeast does not need. (a) False (b) True
37. 37.🍞 Which of these is something yeast needs? (a) sunlight (b) vinegar (c) warm water (d) salt
38. 38.⚖️ 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
39. 39.⚖️ 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
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) warm water (c) a comb (d) turmeric powder

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