Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 1 · 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 battery cell is needed for the yeast balloon. (a) False (b) True
2. 2.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
3. 3.⚖️ 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 amount of water (b) the same bottles (c) the amount of yeast (d) the water temperature
4. 4.🛟 The water for the yeast should be ___. (a) very salty (b) boiling hot (c) warm, not hot (d) ice cold
5. 5.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) air from outside (d) smoke
6. 6.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
7. 7.🍞 Which of these is something yeast needs? (a) warm water (b) sunlight (c) a magnet (d) vinegar
8. 8.⚖️ 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 amount of water (d) the water temperature
9. 9.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
10. 10.🍞 Which of these is something yeast needs? (a) time (b) a magnet (c) sunlight (d) salt
11. 11.⚖️ 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
12. 12.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.🔍 Which is the odd one out? (a) sugar (b) a magnet (c) salt (d) sunlight
14. 14.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
15. 15.⚖️ 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 amount of yeast
16. 16.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) the balloon is smaller (d) it shrinks to nothing
17. 17.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to make bread rise (d) to wash dishes
18. 18.True or false: sugar is something yeast does not need. (a) False (b) True
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a battery cell (d) a balloon
20. 20.🔍 Which is the odd one out? (a) time (b) salt (c) sugar (d) warm water
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) a comb (d) dry yeast
22. 22.🔍 Which is the odd one out? (a) time (b) sugar (c) warm water (d) a magnet
23. 23.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
24. 24.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) dry yeast (c) a balloon (d) a small bottle
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a magnet (d) warm water
27. 27.True or false: vinegar is something yeast needs. (a) False (b) True
28. 28.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) warm water (c) a comb (d) a mirror
29. 29.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
30. 30.⚖️ 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
31. 31.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
32. 32.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a magnet (c) a mirror (d) a comb
33. 33.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
34. 34.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it grows much faster (d) it bursts at once
35. 35.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) dry yeast (c) sugar (d) a balloon
37. 37.⚖️ 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 measure it (b) we keep it the same (c) we change it
38. 38.🍞 Which of these is something yeast does not need? (a) sunlight (b) time (c) sugar (d) warm water
39. 39.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
40. 40.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sugar (d) vinegar

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