Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 285 · 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) dry yeast (b) a small bottle (c) warm water (d) a battery cell
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 same bottles (b) size of the balloon (c) the water temperature
3. 3.🔍 Which is the odd one out? (a) time (b) salt (c) sunlight (d) vinegar
4. 4.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) the yeast is killed (d) it grows faster
5. 5.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a mirror (c) a balloon (d) a comb
6. 6.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
7. 7.True or false: a magnet is something yeast needs. (a) False (b) True
8. 8.True or false: salt is something yeast does not need. (a) False (b) True
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of yeast”? (a) we change it (b) we keep it the same (c) we measure it
10. 10.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) it is food for yeast (d) to colour it
11. 11.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) sugar (d) a battery cell
13. 13.⚖️ 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
14. 14.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a tiny living fungus (d) a kind of sugar
15. 15.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
16. 16.True or false: time is something yeast needs. (a) False (b) True
17. 17.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) vinegar (d) sugar
18. 18.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
19. 19.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) put it in your mouth (c) throw it at a wall (d) pour it down the sink
20. 20.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) time (d) vinegar
21. 21.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
22. 22.🛟 The water for the yeast should be ___. (a) ice cold (b) warm, not hot (c) very salty (d) boiling hot
23. 23.⚖️ 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 sugar (b) the amount of yeast (c) size of the balloon (d) the water temperature
24. 24.⚖️ 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
25. 25.⚖️ 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
26. 26.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) a balloon (c) warm water (d) a small bottle
27. 27.⚖️ 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 amount of yeast (c) size of the balloon
28. 28.🍞 Which of these is something yeast needs? (a) warm water (b) sunlight (c) salt (d) vinegar
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a mirror (c) a small bottle (d) warm water
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) dry yeast (d) turmeric powder
31. 31.⚖️ 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 yeast (b) the same bottles (c) size of the balloon (d) the water temperature
32. 32.⚖️ 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
33. 33.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a comb (c) a mirror (d) dry yeast
34. 34.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) salt
35. 35.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it turns yellow (d) it grows much faster
36. 36.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
37. 37.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to colour rice (d) to wash dishes
39. 39.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) turmeric powder (c) warm water (d) a magnet
40. 40.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed

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