Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 765 · 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: a small bottle is not needed for the yeast balloon. (a) False (b) True
2. 2.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a battery cell (c) turmeric powder (d) a magnet
3. 3.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
4. 4.⚖️ 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) the amount of sugar (c) the amount of yeast (d) size of the balloon
5. 5.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
6. 6.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “size of the balloon”? (a) we measure it (b) we keep it the same (c) we change it
8. 8.⚖️ 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 same bottles (c) size of the balloon
9. 9.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
10. 10.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
11. 11.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
12. 12.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) throw it at a wall (d) put it in your mouth
13. 13.True or false: sugar is something yeast does not need. (a) False (b) True
14. 14.⚖️ 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
15. 15.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) very salty (d) boiling hot
16. 16.🔍 Which is the odd one out? (a) sugar (b) warm water (c) salt (d) time
17. 17.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) sunlight (d) warm water
18. 18.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a small bottle (c) a mirror (d) dry yeast
19. 19.True or false: vinegar is something yeast needs. (a) True (b) False
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a comb (c) dry yeast (d) a mirror
21. 21.⚖️ 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 yeast (c) the same bottles (d) the amount of sugar
22. 22.🍞 Which of these is something yeast does not need? (a) vinegar (b) sugar (c) time (d) warm water
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a comb (d) warm water
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) turmeric powder (d) warm water
25. 25.⚖️ 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 yeast (c) the water temperature
26. 26.⚖️ 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
27. 27.⚖️ 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
28. 28.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) carbon dioxide gas (c) smoke (d) steam
29. 29.🍞 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
30. 30.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
31. 31.🍞 Which of these is something yeast needs? (a) sunlight (b) salt (c) time (d) a magnet
32. 32.📘 What is yeast? (a) a tiny living fungus (b) a kind of salt (c) a kind of sugar (d) a kind of stone
33. 33.True or false: a magnet is something yeast needs. (a) True (b) False
34. 34.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
35. 35.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
36. 36.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
37. 37.🍞 Which of these is something yeast does not need? (a) sugar (b) sunlight (c) warm water (d) time
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True
39. 39.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
40. 40.🍞 Which of these is something yeast needs? (a) sunlight (b) sugar (c) salt (d) vinegar

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