Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 570 · 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.True or false: vinegar is something yeast does not need. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) sugar (b) salt (c) sunlight (d) a magnet
3. 3.🔍 Which is the odd one out? (a) warm water (b) time (c) a magnet (d) sugar
4. 4.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) keep it for a month (d) pour it down the sink
5. 5.⚖️ 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
6. 6.🔍 Which is the odd one out? (a) time (b) sunlight (c) warm water (d) sugar
7. 7.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) warm, not hot (d) very salty
8. 8.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
9. 9.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of stone (d) a kind of salt
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 sugar”? (a) we change it (b) we measure it (c) we keep it the same
11. 11.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) sugar (d) salt
12. 12.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
13. 13.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
14. 14.True or false: a mirror is not needed for the yeast balloon. (a) True (b) False
15. 15.⚖️ 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
16. 16.🔍 Which is the odd one out? (a) time (b) vinegar (c) warm water (d) sugar
17. 17.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a comb (c) a mirror (d) a magnet
18. 18.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows much faster (d) it grows very little
19. 19.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) False (b) True
20. 20.True or false: salt is something yeast does not need. (a) False (b) True
21. 21.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) it turns to sugar (d) the yeast is killed
22. 22.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold water is heavy (d) cold kills sugar
23. 23.🍞 Which of these is something yeast does not need? (a) sunlight (b) time (c) sugar (d) warm water
24. 24.True or false: sugar is something yeast does not need. (a) False (b) True
25. 25.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) the balloon is bigger (d) it turns to bread
26. 26.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to colour it (c) to make it heavy (d) to make it sweet
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a mirror (d) warm water
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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) sugar (c) a balloon (d) dry yeast
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) time (b) warm water (c) salt (d) sugar
32. 32.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) warm water (d) a battery cell
33. 33.⚖️ 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 same bottles (c) size of the balloon (d) the water temperature
34. 34.⚖️ 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 water temperature (c) size of the balloon (d) the amount of yeast
35. 35.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) warm water (c) a balloon (d) a small bottle
37. 37.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
38. 38.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) vinegar
39. 39.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
40. 40.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it

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