Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 665 · 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.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) ice cold (d) warm, not hot
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) a comb (d) sugar
3. 3.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) dry yeast (d) a mirror
4. 4.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) warm water (d) a battery cell
5. 5.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
6. 6.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a magnet (d) a balloon
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a battery cell (c) a magnet (d) a balloon
8. 8.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
9. 9.True or false: vinegar is something yeast does not need. (a) False (b) True
10. 10.🧺 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
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) turmeric powder (c) a comb (d) dry yeast
12. 12.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) steam (d) air from outside
13. 13.⚖️ 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
14. 14.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
15. 15.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) salt (b) vinegar (c) time (d) sunlight
17. 17.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) the yeast is killed (c) it glows (d) it grows faster
18. 18.True or false: warm water is something yeast needs. (a) True (b) False
19. 19.🍞 Which of these is something yeast needs? (a) vinegar (b) sugar (c) a magnet (d) salt
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.🔍 Which is the odd one out? (a) warm water (b) time (c) sunlight (d) sugar
22. 22.⚖️ 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 water temperature (d) the amount of sugar
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) the amount of water (c) size of the balloon
24. 24.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “size of the balloon”? (a) we change it (b) we measure it (c) we keep it the same
25. 25.⚖️ 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
26. 26.📘 What is yeast? (a) a kind of salt (b) a kind of stone (c) a tiny living fungus (d) a kind of sugar
27. 27.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it turns yellow (c) it bursts at once (d) it grows much faster
29. 29.🔍 Which is the odd one out? (a) warm water (b) time (c) salt (d) sugar
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) dry yeast (d) a magnet
31. 31.⚖️ 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) size of the balloon (c) the water temperature
32. 32.⚖️ 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
33. 33.🍞 Which of these is something yeast needs? (a) vinegar (b) time (c) salt (d) sunlight
34. 34.True or false: vinegar is something yeast needs. (a) True (b) False
35. 35.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
36. 36.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) dry yeast (c) a paper clip (d) warm water
38. 38.True or false: warm water is not needed for the yeast balloon. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) time (b) warm water (c) vinegar (d) sugar
40. 40.🔍 Which is the odd one out? (a) salt (b) sugar (c) vinegar (d) a magnet

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