Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 676 · 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 needed for the yeast balloon. (a) False (b) True
2. 2.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
3. 3.🧺 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 mirror
4. 4.True or false: dry yeast is not needed for the yeast balloon. (a) True (b) False
5. 5.True or false: warm water is something yeast does not need. (a) True (b) False
6. 6.🛟 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
7. 7.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
8. 8.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a balloon (c) sugar (d) a comb
10. 10.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) warm water (d) salt
11. 11.📘 What is yeast? (a) a tiny living fungus (b) a kind of salt (c) a kind of sugar (d) a kind of stone
12. 12.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.🧺 Do we need a battery cell for the yeast balloon? (a) not needed (b) needed
14. 14.True or false: vinegar is something yeast needs. (a) True (b) False
15. 15.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
16. 16.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
17. 17.🔮 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
18. 18.🛟 The water for the yeast should be ___. (a) very salty (b) warm, not hot (c) ice cold (d) boiling hot
19. 19.🔍 Which is the odd one out? (a) warm water (b) salt (c) vinegar (d) sunlight
20. 20.⚖️ 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 sugar (c) the water temperature
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of yeast”? (a) we change it (b) we keep it the same (c) we measure it
22. 22.⚖️ 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
23. 23.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) it is food for yeast (d) to colour it
24. 24.⚖️ 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 sugar (b) the water temperature (c) size of the balloon (d) the same bottles
25. 25.⚖️ 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 change it (b) we measure it (c) we keep it the same
26. 26.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
27. 27.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a mirror (c) a magnet (d) a paper clip
28. 28.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
29. 29.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) sunlight
30. 30.⚖️ 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
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a balloon (d) turmeric powder
32. 32.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
33. 33.🧺 Do we need warm water for the yeast balloon? (a) needed (b) not needed
34. 34.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it glows (c) it turns to sugar (d) it grows faster
35. 35.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
36. 36.🔍 Which is the odd one out? (a) sugar (b) warm water (c) a magnet (d) time
37. 37.⚖️ 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 yeast (c) the same bottles (d) size of the balloon
38. 38.⚖️ 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
39. 39.🍞 Which of these is something yeast needs? (a) time (b) vinegar (c) sunlight (d) a magnet
40. 40.True or false: sugar is something yeast does not need. (a) False (b) True

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