Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 280 · 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) True (b) False
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) warm water (d) a comb
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
4. 4.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold water is heavy (c) cold kills sugar (d) cold makes it pink
6. 6.True or false: warm water is something yeast does not need. (a) True (b) False
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a mirror (c) dry yeast (d) sugar
8. 8.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a battery cell (c) dry yeast (d) a comb
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a small bottle (d) a paper clip
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a comb (c) a small bottle (d) a battery cell
11. 11.True or false: sunlight is something yeast needs. (a) True (b) False
12. 12.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a battery cell (c) dry yeast (d) a small bottle
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) False (b) True
15. 15.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed
16. 16.True or false: warm water is something yeast needs. (a) True (b) False
17. 17.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) pour it down the sink (d) put it in your mouth
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is the one thing we change. (a) True (b) False
19. 19.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
20. 20.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) smoke (c) air from outside (d) steam
21. 21.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a kind of stone (d) a tiny living fungus
22. 22.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) the balloon is smaller (d) it turns to bread
23. 23.🍞 Which of these is something yeast needs? (a) salt (b) time (c) sunlight (d) vinegar
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a magnet (d) dry yeast
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) the amount of water (c) the amount of sugar (d) size of the balloon
26. 26.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it grows very little (c) it turns yellow (d) it bursts at once
27. 27.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
28. 28.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a small bottle (c) sugar (d) turmeric powder
29. 29.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) vinegar (d) time
30. 30.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) True (b) False
32. 32.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a magnet (d) warm water
34. 34.⚖️ 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
35. 35.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
36. 36.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
37. 37.⚖️ 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 same bottles
38. 38.🔍 Which is the odd one out? (a) a magnet (b) warm water (c) salt (d) sunlight
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 change it (b) we measure it (c) we keep it the same
40. 40.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed

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