Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 58 · 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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) dry yeast (c) a mirror (d) sugar
2. 2.🍞 Where is yeast used in the kitchen? (a) to wash dishes (b) to clean floors (c) to colour rice (d) to make bread rise
3. 3.🍞 Which of these is something yeast needs? (a) vinegar (b) sunlight (c) a magnet (d) time
4. 4.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it bursts at once (c) it turns yellow (d) it grows very little
5. 5.True or false: sugar is something yeast needs. (a) False (b) True
6. 6.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a comb (c) a mirror (d) a magnet
7. 7.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) vinegar
8. 8.True or false: sunlight is something yeast does not need. (a) False (b) True
9. 9.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) the yeast is killed (c) it grows faster (d) it glows
10. 10.⚖️ 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
11. 11.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) sugar (c) a balloon (d) dry yeast
12. 12.📘 What is yeast? (a) a kind of salt (b) a kind of sugar (c) a kind of stone (d) a tiny living fungus
13. 13.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
14. 14.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the same bottles (c) the water temperature (d) the amount of sugar
15. 15.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) sugar (d) turmeric powder
16. 16.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
17. 17.⚖️ 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
18. 18.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) True (b) False
19. 19.🛟 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
20. 20.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
21. 21.🛟 The water for the yeast should be ___. (a) boiling hot (b) very salty (c) warm, not hot (d) ice cold
22. 22.⚖️ 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
23. 23.⚖️ 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
24. 24.🧺 Do we need dry yeast for the yeast balloon? (a) needed (b) not needed
25. 25.True or false: salt is something yeast needs. (a) True (b) False
26. 26.🍞 Which of these is something yeast does not need? (a) time (b) warm water (c) sunlight (d) sugar
27. 27.True or false: sunlight is something yeast needs. (a) False (b) True
28. 28.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
29. 29.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) the amount of sugar (c) size of the balloon
30. 30.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
31. 31.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) sugar (d) vinegar
32. 32.⚖️ 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
33. 33.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
34. 34.True or false: vinegar is something yeast needs. (a) True (b) False
35. 35.True or false: time is something yeast needs. (a) True (b) False
36. 36.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
37. 37.True or false: salt is something yeast does not need. (a) True (b) False
38. 38.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar 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? What do we do with “the same bottles”? (a) we measure it (b) we change it (c) we keep it the same

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