Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 611 · 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.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it sweet (c) to make it heavy (d) it is food for yeast
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) turmeric powder (b) a balloon (c) warm water (d) sugar
3. 3.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) dry yeast (c) a magnet (d) a mirror
4. 4.True or false: sugar is something yeast does not need. (a) False (b) True
5. 5.True or false: warm water is needed for the yeast balloon. (a) False (b) True
6. 6.True or false: a magnet is not needed for the yeast balloon. (a) False (b) True
7. 7.🍞 Does yeast need salt to make gas? (a) yeast does not need it (b) yeast needs it
8. 8.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False
9. 9.🧺 Which of these is needed for the yeast balloon? (a) warm water (b) a mirror (c) a battery cell (d) turmeric powder
10. 10.🍞 Which of these is something yeast does not need? (a) sugar (b) vinegar (c) time (d) warm water
11. 11.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) dry yeast (d) a battery cell
12. 12.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.📘 What is yeast? (a) a kind of salt (b) a tiny living fungus (c) a kind of stone (d) a kind of sugar
14. 14.⚖️ 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 sugar (b) the same bottles (c) the water temperature (d) size of the balloon
15. 15.🛟 The water for the yeast should be ___. (a) warm, not hot (b) boiling hot (c) very salty (d) ice cold
16. 16.⚖️ 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 measure it (b) we change it (c) we keep it the same
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.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) warm water (c) a small bottle (d) a battery cell
19. 19.True or false: a magnet is something yeast needs. (a) False (b) True
20. 20.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we keep it the same (b) we measure it (c) we change it
21. 21.⚖️ 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 amount of yeast (c) the water temperature (d) the same bottles
22. 22.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) sugar (c) dry yeast (d) a small bottle
23. 23.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
24. 24.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
25. 25.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
26. 26.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it grows much faster (c) it bursts at once (d) it grows very little
27. 27.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) keep it for a month (c) pour it down the sink (d) throw it at a wall
28. 28.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) it grows faster (c) the yeast is killed (d) it turns to sugar
29. 29.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) turmeric powder (c) a balloon (d) sugar
31. 31.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) warm water (c) a comb (d) a balloon
32. 32.🔍 Which is the odd one out? (a) warm water (b) salt (c) time (d) sugar
33. 33.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
34. 34.🔍 Which is the odd one out? (a) sugar (b) vinegar (c) sunlight (d) a magnet
35. 35.🧺 Do we need turmeric powder for the yeast balloon? (a) needed (b) not needed
36. 36.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) sunlight (d) warm water
37. 37.True or false: salt is something yeast needs. (a) True (b) False
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a balloon (b) a mirror (c) dry yeast (d) sugar
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a magnet (b) sugar (c) warm water (d) dry yeast
40. 40.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a balloon (c) a magnet (d) a paper clip

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