Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 218 · 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 is the odd one out? (a) salt (b) time (c) a magnet (d) vinegar
2. 2.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) warm water (c) sugar (d) a balloon
3. 3.⚖️ 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 measure it (c) we change it
4. 4.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
5. 5.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) turmeric powder (c) dry yeast (d) a mirror
6. 6.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to colour rice (d) to clean floors
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) warm water (d) a mirror
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is kept the same. (a) False (b) True
9. 9.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) pour it down the sink (c) keep it for a month (d) put it in your mouth
10. 10.🔮 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
11. 11.📘 What is yeast? (a) a kind of sugar (b) a kind of salt (c) a tiny living fungus (d) a kind of stone
12. 12.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a magnet (c) a paper clip (d) turmeric powder
13. 13.True or false: salt is something yeast does not need. (a) True (b) False
14. 14.True or false: sunlight is something yeast needs. (a) False (b) True
15. 15.True or false: sugar is needed for the yeast balloon. (a) False (b) True
16. 16.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
17. 17.🎈 What blows up the balloon in the yeast experiment? (a) air from outside (b) steam (c) smoke (d) carbon dioxide gas
18. 18.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a small bottle (c) a mirror (d) a battery cell
19. 19.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the same bottles (b) size of the balloon (c) the amount of sugar (d) the amount of water
20. 20.🔍 Which is the odd one out? (a) salt (b) sunlight (c) a magnet (d) sugar
21. 21.⚖️ 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
22. 22.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
23. 23.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
24. 24.True or false: sugar is something yeast needs. (a) False (b) True
25. 25.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a paper clip (c) a balloon (d) warm water
26. 26.⚖️ 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) False (b) True
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) warm water (d) a magnet
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) dry yeast (c) a balloon (d) warm water
29. 29.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) sugar (c) warm water (d) a mirror
30. 30.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of sugar”? (a) we keep it the same (b) we measure it (c) we change it
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) a small bottle (c) warm water (d) dry yeast
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a comb (c) a small bottle (d) a balloon
33. 33.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold makes it pink (d) cold slows yeast down
34. 34.⚖️ 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
35. 35.🔍 Which is the odd one out? (a) time (b) vinegar (c) sugar (d) warm water
36. 36.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) boiling hot (d) ice cold
37. 37.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) warm water (c) a mirror (d) dry yeast
38. 38.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is the one thing we change. (a) False (b) True
39. 39.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
40. 40.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a battery cell (b) sugar (c) a small bottle (d) a balloon

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