Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 960 · 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.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
2. 2.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the amount of water (c) the water temperature
4. 4.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) vinegar (b) warm water (c) time (d) sugar
6. 6.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) it glows (d) the yeast is killed
7. 7.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
8. 8.⚖️ 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) size of the balloon (c) the water temperature (d) the amount of sugar
9. 9.🔍 Which is the odd one out? (a) salt (b) warm water (c) sugar (d) time
10. 10.True or false: vinegar is something yeast does not need. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) sunlight (b) time (c) warm water (d) sugar
12. 12.🍞 Which of these is something yeast needs? (a) time (b) salt (c) vinegar (d) sunlight
13. 13.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it turns yellow (d) it grows very little
14. 14.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) dry yeast (d) a paper clip
15. 15.⚖️ 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) False (b) True
16. 16.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
17. 17.True or false: a small bottle is not needed for the yeast balloon. (a) True (b) False
18. 18.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold water is heavy (c) cold kills sugar (d) cold slows yeast down
19. 19.True or false: a magnet is something yeast needs. (a) False (b) True
20. 20.True or false: sugar is needed for the yeast balloon. (a) True (b) False
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a balloon (d) a comb
22. 22.🍞 Which of these is something yeast needs? (a) vinegar (b) salt (c) warm water (d) a magnet
23. 23.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) True (b) False
24. 24.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) very salty (d) boiling hot
25. 25.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
26. 26.⚖️ 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 measure it (b) we change it (c) we keep it the same
27. 27.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) warm water (c) dry yeast (d) a battery cell
29. 29.🍞 Which of these is something yeast does not need? (a) salt (b) time (c) warm water (d) sugar
30. 30.True or false: sugar is something yeast does not need. (a) False (b) True
31. 31.⚖️ 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) False (b) True
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) a small bottle (d) a magnet
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) turmeric powder (c) dry yeast (d) a small bottle
34. 34.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
35. 35.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of stone (d) a kind of salt
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a battery cell (d) warm water
37. 37.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) put it in your mouth (d) pour it down the sink
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) a paper clip (d) a balloon
39. 39.⚖️ 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
40. 40.True or false: a comb is needed for the yeast balloon. (a) True (b) False

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