Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 401 · 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? Which of these is what we measure? (a) the amount of sugar (b) the water temperature (c) the amount of yeast (d) size of the balloon
2. 2.🔍 Which is the odd one out? (a) salt (b) warm water (c) a magnet (d) vinegar
3. 3.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a kind of sugar (d) a tiny living fungus
4. 4.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
5. 5.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it turns yellow (d) it grows very little
6. 6.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a mirror (c) a battery cell (d) a magnet
7. 7.🧺 Do we need a balloon for the yeast balloon? (a) not needed (b) needed
8. 8.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) salt (d) warm water
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a magnet (c) a balloon (d) a small bottle
10. 10.🔍 Which is the odd one out? (a) sugar (b) warm water (c) sunlight (d) time
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) sugar (c) a battery cell (d) turmeric powder
12. 12.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is what we measure. (a) False (b) True
13. 13.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
14. 14.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
15. 15.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it turns to sugar (d) it grows faster
16. 16.🍞 Which of these is something yeast does not need? (a) warm water (b) vinegar (c) time (d) sugar
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) False (b) True
18. 18.⚖️ 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 keep it the same (b) we measure it (c) we change it
19. 19.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) air from outside (d) smoke
20. 20.🛟 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
21. 21.🔍 Which is the odd one out? (a) warm water (b) sugar (c) salt (d) time
22. 22.⚖️ 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 change it (b) we keep it the same (c) we measure it
23. 23.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it turns to bread (c) it shrinks to nothing (d) the balloon is bigger
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
25. 25.True or false: sugar is needed for the yeast balloon. (a) False (b) True
26. 26.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
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) False (b) True
28. 28.True or false: a magnet is something yeast needs. (a) False (b) True
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) turmeric powder (d) sugar
30. 30.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
31. 31.True or false: sugar is something yeast needs. (a) False (b) True
32. 32.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.True or false: a magnet is something yeast does not need. (a) False (b) True
34. 34.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
35. 35.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to make bread rise (d) to clean floors
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a paper clip (c) a small bottle (d) dry yeast
37. 37.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
38. 38.⚖️ 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
39. 39.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
40. 40.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it

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