Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 172 · 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.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
2. 2.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
3. 3.⚖️ 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
4. 4.🛟 After the yeast experiment, what should you do with the mixture? (a) keep it for a month (b) throw it at a wall (c) pour it down the sink (d) put it in your mouth
5. 5.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a small bottle (c) warm water (d) a mirror
6. 6.⚖️ 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
7. 7.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.🔍 Which is the odd one out? (a) salt (b) a magnet (c) warm water (d) sunlight
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is kept the same. (a) True (b) False
10. 10.⚖️ 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
11. 11.⚖️ 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 water temperature (b) the amount of yeast (c) the amount of sugar (d) the amount of water
12. 12.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
13. 13.True or false: a magnet is something yeast does not need. (a) False (b) True
14. 14.⚖️ 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 yeast (c) the water temperature
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) dry yeast (d) a magnet
16. 16.🔍 Which is the odd one out? (a) a magnet (b) sunlight (c) salt (d) sugar
17. 17.True or false: warm water is something yeast needs. (a) False (b) True
18. 18.True or false: a comb is not needed for the yeast balloon. (a) False (b) True
19. 19.🧺 Which of these is needed for the yeast balloon? (a) a small bottle (b) a battery cell (c) a paper clip (d) a mirror
20. 20.⚖️ 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
21. 21.⚖️ 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) size of the balloon (c) the same bottles (d) the amount of water
22. 22.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of sugar (d) a kind of salt
23. 23.True or false: dry yeast is not needed for the yeast balloon. (a) False (b) True
24. 24.⚖️ 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 keep it the same (b) we change it (c) we measure it
25. 25.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) to make it sweet (d) it is food for yeast
26. 26.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
27. 27.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a paper clip (c) sugar (d) a comb
28. 28.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it turns to sugar (d) it glows
29. 29.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows much faster (d) it grows very little
30. 30.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) ice cold (d) very salty
31. 31.🔍 Which is the odd one out? (a) time (b) vinegar (c) warm water (d) sugar
32. 32.True or false: salt is something yeast needs. (a) False (b) True
33. 33.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a battery cell (c) sugar (d) a balloon
34. 34.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🍞 Which of these is something yeast needs? (a) a magnet (b) time (c) sunlight (d) salt
36. 36.🍞 Which of these is something yeast does not need? (a) time (b) salt (c) sugar (d) warm water
37. 37.⚖️ 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
38. 38.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
39. 39.🍞 Which of these is something yeast needs? (a) sugar (b) sunlight (c) a magnet (d) vinegar
40. 40.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False

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