Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 157 · 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.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) keep it for a month (d) put it in your mouth
2. 2.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) very salty (d) boiling hot
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 measure it (b) we change it (c) we keep it the same
4. 4.True or false: a balloon is needed for the yeast balloon. (a) True (b) False
5. 5.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of stone (d) a kind of salt
6. 6.⚖️ 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 keep it the same (b) we measure it (c) we change it
7. 7.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it glows (d) it turns to sugar
8. 8.True or false: time is something yeast needs. (a) True (b) False
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) a paper clip (d) a small bottle
10. 10.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
11. 11.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a comb (c) a paper clip (d) a small bottle
12. 12.True or false: a magnet is something yeast needs. (a) False (b) True
13. 13.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
14. 14.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) sunlight
15. 15.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
16. 16.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
17. 17.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold makes it pink (c) cold water is heavy (d) cold slows yeast down
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (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) size of the balloon (b) the water temperature (c) the amount of sugar (d) the amount of water
20. 20.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
21. 21.🔮 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 smaller (d) the balloon is bigger
22. 22.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to colour rice (d) to make bread rise
23. 23.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) salt (d) sugar
24. 24.⚖️ 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
25. 25.🔍 Which is the odd one out? (a) warm water (b) time (c) sugar (d) vinegar
26. 26.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.⚖️ 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
29. 29.⚖️ 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 measure it (c) we keep it the same
30. 30.⚖️ 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 water temperature (b) size of the balloon (c) the amount of sugar (d) the same bottles
31. 31.True or false: time is something yeast does not need. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) sugar (b) time (c) sunlight (d) warm water
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a small bottle (d) a comb
34. 34.True or false: sugar is something yeast needs. (a) True (b) False
35. 35.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) turmeric powder (c) dry yeast (d) sugar
36. 36.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a comb (c) sugar (d) dry yeast
38. 38.🍞 Why do we add sugar to the yeast? (a) to make it sweet (b) it is food for yeast (c) to colour it (d) to make it heavy
39. 39.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
40. 40.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it

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