Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 990 · 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.🛟 The water for the yeast should be ___. (a) very salty (b) ice cold (c) boiling hot (d) warm, not hot
2. 2.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it turns yellow (d) it grows much faster
3. 3.True or false: sugar is not needed for the yeast balloon. (a) True (b) False
4. 4.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
5. 5.⚖️ 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) True (b) False
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) a balloon (c) sugar (d) a small bottle
7. 7.⚖️ 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 same bottles (c) size of the balloon (d) the water temperature
8. 8.⚖️ 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) True (b) False
9. 9.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
10. 10.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a mirror (c) a paper clip (d) a comb
11. 11.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
12. 12.True or false: vinegar is something yeast needs. (a) False (b) True
13. 13.⚖️ 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
14. 14.🔍 Which is the odd one out? (a) vinegar (b) a magnet (c) sugar (d) salt
15. 15.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) put it in your mouth (c) throw it at a wall (d) keep it for a month
16. 16.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) air from outside (c) carbon dioxide gas (d) steam
17. 17.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a magnet (c) a mirror (d) a paper clip
18. 18.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
19. 19.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a comb (c) dry yeast (d) sugar
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) a paper clip (b) a balloon (c) dry yeast (d) a small bottle
21. 21.⚖️ 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) True (b) False
22. 22.⚖️ 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 measure it (b) we change it (c) we keep it the same
23. 23.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.True or false: a balloon is needed for the yeast balloon. (a) False (b) True
25. 25.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) salt (d) sugar
26. 26.⚖️ 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
27. 27.🍞 Which of these is something yeast needs? (a) a magnet (b) sugar (c) salt (d) sunlight
28. 28.⚖️ 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
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a mirror (c) warm water (d) a balloon
30. 30.🔍 Which is the odd one out? (a) a magnet (b) time (c) sunlight (d) vinegar
31. 31.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
32. 32.⚖️ 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 water (c) size of the balloon (d) the same bottles
33. 33.True or false: sunlight is something yeast needs. (a) False (b) True
34. 34.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a kind of stone (d) a tiny living fungus
35. 35.🧺 Do we need a magnet for the yeast balloon? (a) not needed (b) needed
36. 36.True or false: a magnet is needed for the yeast balloon. (a) True (b) False
37. 37.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) vinegar (d) sugar
38. 38.True or false: a paper clip is needed for the yeast balloon. (a) True (b) False
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
40. 40.⚖️ 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 yeast (b) the water temperature (c) size of the balloon

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