Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 413 · 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 vinegar to make gas? (a) yeast needs it (b) yeast does not need it
2. 2.True or false: sunlight is something yeast does not need. (a) False (b) True
3. 3.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a paper clip (c) a magnet (d) a mirror
4. 4.True or false: warm water is something yeast does not need. (a) True (b) False
5. 5.⚖️ 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
6. 6.🎈 What blows up the balloon in the yeast experiment? (a) steam (b) carbon dioxide gas (c) air from outside (d) smoke
7. 7.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) pour it down the sink (c) put it in your mouth (d) throw it at a wall
8. 8.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
9. 9.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
10. 10.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a tiny living fungus (d) a kind of stone
11. 11.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
12. 12.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
13. 13.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
14. 14.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it sweet (c) to make it heavy (d) to colour it
15. 15.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
16. 16.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) the yeast is killed (d) it glows
17. 17.True or false: sugar is something yeast needs. (a) False (b) True
18. 18.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) sugar (d) a balloon
19. 19.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a small bottle (c) warm water (d) a magnet
20. 20.⚖️ 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 keep it the same (c) we change it
21. 21.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a balloon (c) dry yeast (d) a mirror
22. 22.🍞 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
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) dry yeast (c) a comb (d) warm water
24. 24.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) warm water (c) a balloon (d) a mirror
25. 25.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a small bottle (d) a magnet
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) dry yeast (c) a balloon (d) a small bottle
27. 27.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) the balloon is smaller (c) it shrinks to nothing (d) the balloon is bigger
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) True (b) False
29. 29.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) turmeric powder (c) a magnet (d) a balloon
30. 30.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to wash dishes (c) to clean floors (d) to make bread rise
31. 31.⚖️ 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
32. 32.True or false: sunlight is something yeast needs. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) sugar (b) time (c) warm water (d) vinegar
34. 34.⚖️ 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
35. 35.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
36. 36.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) warm water (d) a battery cell
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) dry yeast (c) a magnet (d) a mirror
39. 39.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it turns yellow (d) it grows much faster
40. 40.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True

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