Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 732 · 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.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is the one thing we change. (a) False (b) True
2. 2.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
3. 3.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) a balloon (d) a mirror
4. 4.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) warm water (d) vinegar
5. 5.True or false: sunlight is something yeast needs. (a) False (b) True
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) sugar (d) a mirror
7. 7.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) a magnet (d) sugar
8. 8.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it turns to sugar (c) the yeast is killed (d) it grows faster
9. 9.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) time (d) salt
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) dry yeast (d) a mirror
11. 11.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) carbon dioxide gas (c) air from outside (d) steam
12. 12.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
13. 13.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) put it in your mouth (d) keep it for a month
14. 14.🔍 Which is the odd one out? (a) vinegar (b) sunlight (c) salt (d) warm water
15. 15.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) sunlight (d) warm water
16. 16.⚖️ 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 same bottles
17. 17.⚖️ 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
18. 18.True or false: sugar is not needed for the yeast balloon. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) a magnet (b) sugar (c) vinegar (d) salt
20. 20.🧺 Which of these is not needed for the yeast balloon? (a) a small bottle (b) sugar (c) dry yeast (d) a comb
21. 21.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of sugar (d) a kind of salt
22. 22.⚖️ 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
23. 23.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
24. 24.🔮 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
25. 25.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
26. 26.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
27. 27.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
28. 28.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
30. 30.⚖️ 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 sugar (c) the water temperature (d) size of the balloon
31. 31.True or false: turmeric powder is not needed for the yeast balloon. (a) True (b) False
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a paper clip (c) warm water (d) sugar
33. 33.True or false: vinegar is something yeast does not need. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) time (b) a magnet (c) salt (d) sunlight
35. 35.🔍 Which is the odd one out? (a) sunlight (b) warm water (c) sugar (d) time
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a magnet (c) a balloon (d) a small bottle
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is kept the same. (a) True (b) False
38. 38.⚖️ 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) False (b) True
39. 39.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) the balloon is smaller (c) it turns to bread (d) the balloon is bigger
40. 40.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to clean floors (d) to colour rice

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