Yeast Balloon Experiment Worksheet

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

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