Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 701 · 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.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a paper clip (c) warm water (d) a mirror
2. 2.🍞 Why does yeast work slowly in cold water? (a) cold makes it pink (b) cold slows yeast down (c) cold kills sugar (d) cold water is heavy
3. 3.⚖️ 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) False (b) True
4. 4.True or false: a mirror is needed for the yeast balloon. (a) True (b) False
5. 5.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “size of the balloon”? (a) we change it (b) we keep it the same (c) we measure it
6. 6.⚖️ 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
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 yeast (b) the water temperature (c) the amount of water (d) the amount of sugar
8. 8.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to colour rice (c) to make bread rise (d) to wash dishes
9. 9.⚖️ 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
10. 10.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
11. 11.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
12. 12.True or false: a small bottle is needed for the yeast balloon. (a) True (b) False
13. 13.True or false: warm water is something yeast does not need. (a) False (b) True
14. 14.🍞 Which of these is something yeast needs? (a) a magnet (b) vinegar (c) sunlight (d) sugar
15. 15.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) warm water (c) a battery cell (d) a small bottle
16. 16.⚖️ 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
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) turmeric powder (d) warm water
18. 18.True or false: sunlight is something yeast needs. (a) False (b) True
19. 19.🔮 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
20. 20.⚖️ 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) False (b) True
21. 21.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it turns to sugar (c) it glows (d) it grows faster
22. 22.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
23. 23.🍞 Which of these is something yeast does not need? (a) vinegar (b) sugar (c) warm water (d) time
24. 24.🔍 Which is the odd one out? (a) salt (b) vinegar (c) sugar (d) sunlight
25. 25.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
26. 26.True or false: sugar is needed for the yeast balloon. (a) True (b) False
27. 27.⚖️ 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
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a balloon (d) a battery cell
29. 29.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows very little (c) it grows much faster (d) it bursts at once
30. 30.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a paper clip (c) turmeric powder (d) sugar
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) dry yeast (c) a paper clip (d) a small bottle
32. 32.🍞 Does yeast need time to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) put it in your mouth (d) keep it for a month
34. 34.⚖️ 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 sugar (b) the amount of yeast (c) size of the balloon (d) the water temperature
35. 35.🍞 Does yeast need sunlight to make gas? (a) yeast needs it (b) yeast does not need it
36. 36.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
37. 37.🍞 Which of these is something yeast needs? (a) vinegar (b) time (c) a magnet (d) sunlight
38. 38.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) dry yeast (c) sugar (d) a balloon
39. 39.📘 What is yeast? (a) a kind of sugar (b) a kind of stone (c) a tiny living fungus (d) a kind of salt
40. 40.True or false: vinegar is something yeast does not need. (a) True (b) False

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