Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 432 · 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.⚖️ 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 keep it the same (c) we change it
2. 2.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it glows (c) the yeast is killed (d) it turns to sugar
3. 3.🔍 Which is the odd one out? (a) a magnet (b) salt (c) warm water (d) sunlight
4. 4.⚖️ 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 change it (c) we keep it the same
5. 5.True or false: salt is something yeast needs. (a) False (b) True
6. 6.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
7. 7.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a paper clip (d) warm water
9. 9.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a tiny living fungus (d) a kind of sugar
10. 10.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
11. 11.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it bursts at once (c) it grows much faster (d) it turns yellow
12. 12.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) a magnet (d) warm water
13. 13.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a magnet (c) a balloon (d) dry yeast
14. 14.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to make bread rise (d) to clean floors
15. 15.⚖️ 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
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of sugar (b) the water temperature (c) size of the balloon
17. 17.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
18. 18.True or false: a magnet 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? Which of these is what we measure? (a) the amount of sugar (b) size of the balloon (c) the amount of yeast (d) the water temperature
20. 20.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold water is heavy (c) cold kills sugar (d) cold makes it pink
21. 21.⚖️ 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 water temperature (d) size of the balloon
22. 22.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) sunlight
23. 23.🔍 Which is the odd one out? (a) sugar (b) warm water (c) vinegar (d) time
24. 24.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
25. 25.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a balloon (c) a comb (d) a magnet
26. 26.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.⚖️ 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) True (b) False
28. 28.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
30. 30.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) salt
31. 31.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) False (b) True
33. 33.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) put it in your mouth (d) keep it for a month
34. 34.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
35. 35.True or false: vinegar is something yeast does not need. (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 water temperature is what we measure. (a) False (b) True
37. 37.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) a magnet (d) sugar
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.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
40. 40.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) sugar (d) vinegar

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