Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 256 · 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.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
2. 2.⚖️ 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 keep it the same (b) we measure it (c) we change it
3. 3.⚖️ 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 measure it (c) we keep it the same
4. 4.📘 What is yeast? (a) a kind of stone (b) a kind of salt (c) a tiny living fungus (d) a kind of sugar
5. 5.⚖️ 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
6. 6.🔍 Which is the odd one out? (a) warm water (b) time (c) sunlight (d) sugar
7. 7.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
8. 8.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) the water temperature (c) size of the balloon (d) the amount of sugar
10. 10.True or false: sugar is something yeast needs. (a) False (b) True
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) sugar (d) turmeric powder
12. 12.🍞 Which of these is something yeast needs? (a) vinegar (b) a magnet (c) sugar (d) salt
13. 13.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
14. 14.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) warm, not hot (d) boiling hot
15. 15.⚖️ 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
16. 16.⚖️ 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) the amount of yeast (c) size of the balloon (d) the same bottles
17. 17.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
18. 18.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
19. 19.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
20. 20.🔍 Which is the odd one out? (a) time (b) vinegar (c) sunlight (d) a magnet
21. 21.⚖️ 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
22. 22.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
23. 23.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
24. 24.True or false: salt is something yeast needs. (a) False (b) True
25. 25.⚖️ 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) size of the balloon (c) the same bottles
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a magnet (c) sugar (d) a small bottle
27. 27.⚖️ 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 sugar (c) size of the balloon
28. 28.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
29. 29.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
30. 30.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) dry yeast (d) a battery cell
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) warm water (c) dry yeast (d) a small bottle
32. 32.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
33. 33.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it turns to sugar (d) it glows
34. 34.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
35. 35.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a battery cell (c) dry yeast (d) a small bottle
36. 36.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) a magnet (d) a balloon
37. 37.⚖️ 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
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a battery cell (d) sugar
39. 39.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it grows very little (d) it bursts at once
40. 40.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True

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