Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 830 · 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) boiling hot (b) ice cold (c) very salty (d) warm, not hot
2. 2.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it grows faster (c) the yeast is killed (d) it glows
3. 3.⚖️ 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) False (b) True
4. 4.True or false: warm water is something yeast needs. (a) True (b) False
5. 5.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
6. 6.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) salt (d) sugar
7. 7.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
8. 8.⚖️ 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) size of the balloon (c) the same bottles (d) the amount of water
9. 9.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.⚖️ 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 change it (b) we measure it (c) we keep it the same
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a mirror (d) a balloon
12. 12.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) vinegar
13. 13.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
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 amount of sugar (c) the water temperature
15. 15.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
16. 16.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a magnet (d) sugar
17. 17.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
18. 18.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
19. 19.⚖️ 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
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) warm water (c) a magnet (d) turmeric powder
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) True (b) False
22. 22.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
23. 23.🛟 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
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) sugar (d) a paper clip
25. 25.📘 What is yeast? (a) a kind of salt (b) a tiny living fungus (c) a kind of sugar (d) a kind of stone
26. 26.🔍 Which is the odd one out? (a) salt (b) vinegar (c) sunlight (d) warm water
27. 27.True or false: time is something yeast needs. (a) False (b) True
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a comb (c) sugar (d) a small bottle
29. 29.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) a comb (d) dry yeast
30. 30.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
31. 31.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) sugar (d) salt
32. 32.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
33. 33.⚖️ 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
34. 34.True or false: warm water is something yeast does not need. (a) False (b) True
35. 35.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a small bottle (c) a battery cell (d) a mirror
36. 36.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) the balloon is smaller (d) it turns to bread
37. 37.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) to make it heavy (c) to colour it (d) it is food for yeast
38. 38.🍞 Which of these is something yeast needs? (a) sunlight (b) time (c) a magnet (d) vinegar
39. 39.⚖️ 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 keep it the same (c) we measure it
40. 40.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed

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