Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 531 · 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: dry yeast is needed for the yeast balloon. (a) False (b) True
2. 2.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
3. 3.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
4. 4.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to wash dishes (d) to colour rice
5. 5.⚖️ 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 measure it (b) we change it (c) we keep it the same
6. 6.⚖️ 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
7. 7.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
8. 8.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
9. 9.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) pour it down the sink (d) put it in your mouth
12. 12.⚖️ 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 amount of yeast (c) the water temperature (d) the amount of sugar
13. 13.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
14. 14.True or false: vinegar is something yeast needs. (a) True (b) False
15. 15.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold makes it pink (d) cold slows yeast down
16. 16.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
17. 17.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
18. 18.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
19. 19.🍞 Which of these is something yeast does not need? (a) salt (b) sugar (c) warm water (d) time
20. 20.📘 What is yeast? (a) a kind of stone (b) a tiny living fungus (c) a kind of sugar (d) a kind of salt
21. 21.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
22. 22.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) sugar (d) a paper clip
23. 23.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) the balloon is smaller (c) it turns to bread (d) it shrinks to nothing
24. 24.⚖️ 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 water temperature (c) the amount of sugar
25. 25.🍞 Which of these is something yeast needs? (a) a magnet (b) sunlight (c) sugar (d) salt
26. 26.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) dry yeast (d) a battery cell
27. 27.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it bursts at once (d) it grows very little
28. 28.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.True or false: vinegar is something yeast does not need. (a) True (b) False
30. 30.True or false: sugar is something yeast does not need. (a) True (b) False
31. 31.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
32. 32.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) sunlight (d) warm water
33. 33.⚖️ 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
34. 34.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) False (b) True
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
37. 37.⚖️ 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
38. 38.⚖️ 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
39. 39.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
40. 40.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) dry yeast (d) a magnet

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