Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 468 · 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: warm water is something yeast needs. (a) False (b) True
2. 2.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a battery cell (c) sugar (d) a comb
3. 3.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sunlight (d) sugar
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a comb (c) a battery cell (d) a balloon
5. 5.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) salt
6. 6.🍞 Which of these is something yeast needs? (a) salt (b) a magnet (c) vinegar (d) sugar
7. 7.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
8. 8.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to colour rice (d) to make bread rise
9. 9.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
10. 10.⚖️ 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 yeast (b) the amount of water (c) the amount of sugar (d) the water temperature
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) dry yeast (c) a small bottle (d) a balloon
12. 12.⚖️ 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
13. 13.⚖️ 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
14. 14.⚖️ 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 measure it (b) we change it (c) we keep it the same
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) turmeric powder (c) sugar (d) a balloon
16. 16.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it grows faster (d) it glows
17. 17.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold kills sugar (c) cold slows yeast down (d) cold makes it pink
18. 18.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) sugar (d) time
19. 19.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is bigger (c) the balloon is smaller (d) it turns to bread
20. 20.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) put it in your mouth (c) pour it down the sink (d) keep it for a month
21. 21.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) steam (d) smoke
22. 22.📘 What is yeast? (a) a tiny living fungus (b) a kind of sugar (c) a kind of salt (d) a kind of stone
23. 23.🔍 Which is the odd one out? (a) sugar (b) sunlight (c) warm water (d) time
24. 24.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) warm water (d) time
25. 25.True or false: sugar is needed for the yeast balloon. (a) False (b) True
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a paper clip (c) a small bottle (d) sugar
28. 28.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it grows much faster (d) it turns yellow
29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) False (b) True
30. 30.⚖️ 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 same bottles
31. 31.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
32. 32.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
33. 33.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
34. 34.⚖️ 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) False (b) True
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) warm water (c) dry yeast (d) sugar
36. 36.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
37. 37.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
38. 38.⚖️ 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) True (b) False
39. 39.True or false: salt is something yeast does not need. (a) True (b) False
40. 40.True or false: warm water is not needed for the yeast balloon. (a) True (b) False

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