Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 169 · 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.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) pour it down the sink (d) keep it for a month
2. 2.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
3. 3.True or false: sunlight is something yeast needs. (a) False (b) True
4. 4.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.🍞 Why do we add sugar to the yeast? (a) to colour it (b) it is food for yeast (c) to make it sweet (d) to make it heavy
6. 6.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a tiny living fungus (d) a kind of salt
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a small bottle (d) a paper clip
8. 8.True or false: sugar is something yeast does not need. (a) True (b) False
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) size of the balloon (c) the water temperature
10. 10.⚖️ 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
11. 11.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) the balloon is smaller (d) it shrinks to nothing
12. 12.🍞 Which of these is something yeast does not need? (a) time (b) sunlight (c) warm water (d) sugar
13. 13.True or false: salt is something yeast needs. (a) False (b) True
14. 14.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
15. 15.True or false: warm water is something yeast does not need. (a) False (b) True
16. 16.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
17. 17.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a battery cell (d) a balloon
18. 18.🎈 What blows up the balloon in the yeast experiment? (a) carbon dioxide gas (b) air from outside (c) steam (d) smoke
19. 19.True or false: a mirror is needed for the yeast balloon. (a) False (b) True
20. 20.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
21. 21.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a magnet (c) a paper clip (d) sugar
22. 22.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we measure it (b) we keep it the same (c) we change it
23. 23.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it bursts at once (d) it grows very little
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 water (b) the amount of yeast (c) the amount of sugar (d) the water temperature
25. 25.🍞 Which of these is something yeast does not need? (a) a magnet (b) time (c) warm water (d) sugar
26. 26.⚖️ 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 keep it the same (c) we measure it
27. 27.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
28. 28.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we keep it the same (b) we measure it (c) we change it
30. 30.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold kills sugar (d) cold slows yeast down
31. 31.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) sugar (d) a comb
33. 33.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
34. 34.⚖️ 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 keep it the same (b) we measure it (c) we change it
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 kept the same. (a) True (b) False
36. 36.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) sunlight (d) warm water
37. 37.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) a paper clip (c) sugar (d) dry yeast
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) warm water (c) dry yeast (d) turmeric powder
40. 40.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it

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