Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 258 · 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: sugar is something yeast needs. (a) False (b) True
2. 2.True or false: warm water is something yeast needs. (a) True (b) False
3. 3.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it grows faster (d) it turns to sugar
4. 4.⚖️ 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 yeast (b) the amount of sugar (c) size of the balloon (d) the water temperature
5. 5.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
6. 6.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
7. 7.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
8. 8.🍞 Which of these is something yeast needs? (a) time (b) a magnet (c) vinegar (d) salt
9. 9.⚖️ 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
10. 10.True or false: time is something yeast does not need. (a) False (b) True
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) dry yeast (d) a mirror
12. 12.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a battery cell (c) a magnet (d) warm water
13. 13.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
14. 14.⚖️ 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
15. 15.📘 What is yeast? (a) a kind of stone (b) a kind of sugar (c) a kind of salt (d) a tiny living fungus
16. 16.🔍 Which is the odd one out? (a) sugar (b) salt (c) warm water (d) time
17. 17.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.⚖️ 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 sugar (b) the amount of yeast (c) the amount of water (d) the water temperature
19. 19.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a paper clip (c) a magnet (d) a mirror
20. 20.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
21. 21.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
22. 22.🔍 Which is the odd one out? (a) salt (b) vinegar (c) time (d) a magnet
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a balloon (c) warm water (d) a battery cell
24. 24.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) air from outside (d) steam
25. 25.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it turns to bread (d) it shrinks to nothing
26. 26.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) warm water (d) vinegar
27. 27.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
28. 28.⚖️ 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
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) a small bottle (c) sugar (d) dry yeast
30. 30.🔍 Which is the odd one out? (a) sugar (b) warm water (c) a magnet (d) time
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) warm water (d) a battery cell
32. 32.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a mirror (c) a magnet (d) a battery cell
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) dry yeast (d) a comb
34. 34.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a small bottle (d) a magnet
35. 35.🔍 Which is the odd one out? (a) warm water (b) vinegar (c) time (d) sugar
36. 36.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to colour rice (c) to clean floors (d) to wash dishes
37. 37.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
38. 38.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
39. 39.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
40. 40.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) sugar (d) salt

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