Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 853 · 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.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
2. 2.🔍 Which is the odd one out? (a) vinegar (b) salt (c) warm water (d) a magnet
3. 3.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is bigger (d) the balloon is smaller
4. 4.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
5. 5.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) a small bottle (c) a balloon (d) warm water
6. 6.⚖️ 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) False (b) True
7. 7.🔮 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
8. 8.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
9. 9.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
10. 10.🍞 Which of these is something yeast does not need? (a) vinegar (b) time (c) sugar (d) warm water
11. 11.⚖️ 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 same bottles (b) the amount of yeast (c) the amount of water (d) the water temperature
12. 12.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) salt (d) warm water
13. 13.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) carbon dioxide gas (d) air from outside
14. 14.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) warm water (d) a paper clip
15. 15.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
16. 16.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows very little (d) it grows much faster
17. 17.True or false: sunlight is something yeast needs. (a) False (b) True
18. 18.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
19. 19.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a small bottle (c) a mirror (d) a magnet
20. 20.🍞 Which of these is something yeast does not need? (a) a magnet (b) warm water (c) time (d) sugar
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) dry yeast (d) a comb
22. 22.🔍 Which is the odd one out? (a) a magnet (b) time (c) warm water (d) sugar
23. 23.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
24. 24.🍞 Which of these is something yeast needs? (a) time (b) salt (c) vinegar (d) sunlight
25. 25.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
26. 26.⚖️ 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
27. 27.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) it is food for yeast (d) to make it sweet
28. 28.⚖️ 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 keep it the same (c) we measure it
29. 29.True or false: time is something yeast needs. (a) False (b) True
30. 30.⚖️ 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) False (b) True
31. 31.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
32. 32.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a paper clip (d) a balloon
33. 33.⚖️ 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
34. 34.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of sugar (c) the water temperature (d) the amount of water
35. 35.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
36. 36.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a magnet (c) a battery cell (d) a mirror
37. 37.True or false: vinegar is something yeast needs. (a) True (b) False
38. 38.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
39. 39.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
40. 40.True or false: vinegar is something yeast does not need. (a) False (b) True

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