Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 479 · 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.🍞 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
2. 2.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) False (b) True
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) False (b) True
4. 4.True or false: warm water is needed for the yeast balloon. (a) False (b) True
5. 5.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) keep it for a month (d) pour it down the sink
6. 6.🛟 The water for the yeast should be ___. (a) ice cold (b) very salty (c) boiling hot (d) warm, not hot
7. 7.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it bursts at once (d) it turns yellow
8. 8.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a paper clip (c) dry yeast (d) a balloon
10. 10.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a magnet (d) dry yeast
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a battery cell (c) warm water (d) a magnet
12. 12.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to wash dishes (d) to colour rice
13. 13.⚖️ 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
14. 14.True or false: a magnet is something yeast needs. (a) False (b) True
15. 15.True or false: salt is something yeast does not need. (a) True (b) False
16. 16.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a small bottle (c) sugar (d) a comb
18. 18.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sugar (d) a magnet
19. 19.⚖️ 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
20. 20.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a magnet (c) dry yeast (d) a comb
21. 21.🍞 Which of these is something yeast does not need? (a) vinegar (b) time (c) warm water (d) sugar
22. 22.True or false: sugar is something yeast needs. (a) False (b) True
23. 23.True or false: vinegar is something yeast does not need. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) salt (d) sugar
25. 25.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it turns to sugar (d) it glows
26. 26.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
28. 28.True or false: time is something yeast does not need. (a) True (b) False
29. 29.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a tiny living fungus (d) a kind of stone
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is what we measure. (a) False (b) True
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) the amount of sugar (c) size of the balloon
32. 32.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
33. 33.True or false: dry yeast 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? True or false: the water temperature is kept the same. (a) True (b) False
35. 35.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the amount of water (c) the amount of yeast (d) the same bottles
36. 36.True or false: sunlight is something yeast needs. (a) True (b) False
37. 37.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
38. 38.⚖️ 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
39. 39.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) salt (d) vinegar
40. 40.⚖️ 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 keep it the same (b) we measure it (c) we change it

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