Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 597 · 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 time to make gas? (a) yeast needs it (b) yeast does not need it
2. 2.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) very salty (d) warm, not hot
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a magnet (c) a mirror (d) sugar
4. 4.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
5. 5.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
6. 6.🔍 Which is the odd one out? (a) a magnet (b) salt (c) vinegar (d) sugar
7. 7.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a tiny living fungus (d) a kind of stone
8. 8.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold kills sugar (d) cold water is heavy
9. 9.⚖️ 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 keep it the same (b) we measure it (c) we change it
10. 10.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) keep it for a month (d) pour it down the sink
12. 12.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.True or false: salt is something yeast needs. (a) False (b) True
14. 14.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.⚖️ 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 amount of water
16. 16.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it turns yellow (d) it bursts at once
17. 17.🍞 Which of these is something yeast needs? (a) warm water (b) vinegar (c) sunlight (d) salt
18. 18.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a battery cell (c) warm water (d) a small bottle
19. 19.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
20. 20.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) sugar (d) salt
21. 21.⚖️ 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 change it (c) we measure it
22. 22.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a magnet (c) a small bottle (d) a mirror
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a battery cell (c) a balloon (d) a small bottle
24. 24.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
25. 25.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) it turns to bread (d) the balloon is bigger
26. 26.⚖️ 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
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a balloon (c) a comb (d) sugar
28. 28.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a magnet (c) turmeric powder (d) a balloon
29. 29.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) it grows faster (d) the yeast is killed
30. 30.⚖️ 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
31. 31.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
32. 32.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
34. 34.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) True (b) False
36. 36.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) True (b) False
38. 38.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
39. 39.⚖️ 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 water temperature (c) size of the balloon (d) the amount of sugar
40. 40.⚖️ 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 same bottles (d) size of the balloon

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