Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 792 · 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.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) it shrinks to nothing (d) the balloon is bigger
2. 2.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a comb (d) a small bottle
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) dry yeast (d) a paper clip
5. 5.True or false: warm water is something yeast needs. (a) False (b) True
6. 6.⚖️ 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
7. 7.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) vinegar (d) time
8. 8.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) sugar (d) warm water
10. 10.⚖️ 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) True (b) False
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a balloon (c) a magnet (d) a paper clip
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a small bottle (d) turmeric powder
13. 13.🍞 Which of these is something yeast does not need? (a) sugar (b) warm water (c) vinegar (d) time
14. 14.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) pour it down the sink (c) throw it at a wall (d) keep it for a month
15. 15.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it turns yellow (d) it bursts at once
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) False (b) True
17. 17.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
18. 18.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
19. 19.⚖️ 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 change it (b) we keep it the same (c) we measure it
20. 20.⚖️ 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) size of the balloon (c) the same bottles
21. 21.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
22. 22.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) a magnet (d) sunlight
23. 23.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
24. 24.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold slows yeast down (d) cold water is heavy
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a battery cell (c) warm water (d) sugar
26. 26.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) to make it sweet (d) it is food for yeast
27. 27.⚖️ 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 water temperature (c) the same bottles (d) the amount of sugar
28. 28.⚖️ 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
29. 29.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is what we measure. (a) True (b) False
31. 31.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
32. 32.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
33. 33.True or false: time is something yeast needs. (a) True (b) False
34. 34.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
35. 35.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) dry yeast (c) a magnet (d) turmeric powder
36. 36.📘 What is yeast? (a) a kind of salt (b) a tiny living fungus (c) a kind of sugar (d) a kind of stone
37. 37.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
38. 38.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) size of the balloon (c) the amount of water (d) the amount of yeast
40. 40.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it turns to sugar (d) it glows

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