Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 350 · 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 turmeric powder for the yeast balloon? (a) not needed (b) needed
2. 2.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) warm water (d) time
3. 3.⚖️ 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 measure it (c) we keep it the same
4. 4.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) dry yeast (c) a small bottle (d) turmeric powder
5. 5.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) a magnet (d) sugar
6. 6.True or false: sugar is something yeast needs. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) sugar (b) warm water (c) time (d) salt
8. 8.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
9. 9.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) time (d) sugar
10. 10.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it turns yellow (d) it bursts at once
11. 11.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to clean floors (c) to colour rice (d) to wash dishes
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a battery cell (d) a balloon
13. 13.True or false: sugar is needed for the yeast balloon. (a) False (b) True
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) dry yeast (d) turmeric powder
15. 15.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it turns to sugar (d) it grows faster
16. 16.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold kills sugar (c) cold water is heavy (d) cold slows yeast down
17. 17.⚖️ 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) True (b) False
18. 18.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) keep it for a month (d) put it in your mouth
19. 19.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
21. 21.⚖️ 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 water
22. 22.⚖️ 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 sugar (b) the amount of water (c) the same bottles (d) the water temperature
23. 23.🔮 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
24. 24.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
25. 25.True or false: warm water is something yeast does not need. (a) True (b) False
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 yeast”? (a) we change it (b) we measure it (c) we keep it the same
27. 27.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
28. 28.🔍 Which is the odd one out? (a) a magnet (b) time (c) warm water (d) sugar
29. 29.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
30. 30.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
31. 31.🍞 Which of these is something yeast does not need? (a) warm water (b) sunlight (c) sugar (d) time
32. 32.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) vinegar
34. 34.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a kind of stone (d) a tiny living fungus
35. 35.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) sugar (c) a mirror (d) a magnet
36. 36.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
37. 37.True or false: salt is something yeast needs. (a) False (b) True
38. 38.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
39. 39.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) sugar (c) a paper clip (d) dry yeast
40. 40.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it

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