Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 259 · 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? Which of these is what we measure? (a) the amount of sugar (b) the amount of water (c) size of the balloon (d) the same bottles
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a battery cell (d) a small bottle
3. 3.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) ice cold (d) boiling hot
4. 4.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
5. 5.⚖️ 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) size of the balloon (b) the amount of water (c) the water temperature (d) the amount of yeast
6. 6.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) a magnet
7. 7.⚖️ 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
8. 8.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of sugar (d) a kind of salt
9. 9.True or false: a magnet is something yeast needs. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) warm water (b) salt (c) time (d) sugar
11. 11.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) to make it sweet (d) it is food for yeast
12. 12.⚖️ 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) True (b) False
13. 13.True or false: warm water is needed for the yeast balloon. (a) False (b) True
14. 14.⚖️ 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 same bottles (c) the water temperature
15. 15.🍞 Which of these is something yeast needs? (a) a magnet (b) time (c) vinegar (d) salt
16. 16.True or false: sugar is something yeast does not need. (a) False (b) True
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of sugar”? (a) we measure it (b) we keep it the same (c) we change it
18. 18.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) sunlight
19. 19.🔍 Which is the odd one out? (a) sunlight (b) a magnet (c) vinegar (d) sugar
20. 20.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) a magnet (d) dry yeast
22. 22.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to wash dishes (d) to colour rice
23. 23.⚖️ 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) size of the balloon (c) the water temperature
24. 24.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
25. 25.⚖️ 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 measure it (b) we change it (c) we keep it the same
26. 26.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.True or false: a comb is needed for the yeast balloon. (a) True (b) False
28. 28.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a comb (c) a paper clip (d) dry yeast
29. 29.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it grows very little (d) it turns yellow
30. 30.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
31. 31.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
32. 32.True or false: sunlight is something yeast does not need. (a) False (b) True
33. 33.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
34. 34.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
35. 35.⚖️ 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
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) sugar (d) dry yeast
37. 37.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) vinegar (d) time
38. 38.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) it glows (d) the yeast is killed
39. 39.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) it turns to bread (d) the balloon is smaller
40. 40.🍞 Which of these is something yeast needs? (a) sunlight (b) sugar (c) salt (d) vinegar

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