Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 812 · 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 small bottle (b) a mirror (c) dry yeast (d) sugar
2. 2.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) ice cold (d) very salty
3. 3.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) throw it at a wall (c) keep it for a month (d) put it in your mouth
4. 4.🧺 Which of these is needed for the yeast balloon? (a) a balloon (b) a magnet (c) a comb (d) a mirror
5. 5.🍞 Does yeast need sugar to make gas? (a) yeast needs it (b) yeast does not need it
6. 6.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
7. 7.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) a small bottle (c) dry yeast (d) sugar
8. 8.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
9. 9.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
10. 10.⚖️ 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 yeast (c) the amount of sugar (d) the water temperature
11. 11.True or false: warm water is something yeast needs. (a) False (b) True
12. 12.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
13. 13.🍞 Which of these is something yeast does not need? (a) time (b) a magnet (c) sugar (d) warm water
14. 14.🧺 Do we need a comb for the yeast balloon? (a) needed (b) not needed
15. 15.🍞 Where is yeast used in the kitchen? (a) to make bread rise (b) to wash dishes (c) to clean floors (d) to colour rice
16. 16.🔍 Which is the odd one out? (a) sugar (b) time (c) vinegar (d) warm water
17. 17.True or false: salt is something yeast does not need. (a) False (b) True
18. 18.🍞 Why do we add sugar to the yeast? (a) to colour it (b) to make it heavy (c) it is food for yeast (d) to make it sweet
19. 19.⚖️ 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
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a magnet (d) dry yeast
21. 21.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows very little (c) it grows much faster (d) it turns yellow
22. 22.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
23. 23.True or false: dry yeast is needed for the yeast balloon. (a) True (b) False
24. 24.🍞 Which of these is something yeast needs? (a) warm water (b) vinegar (c) salt (d) a magnet
25. 25.⚖️ 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
26. 26.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a small bottle (c) sugar (d) a magnet
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the water temperature (b) size of the balloon (c) the amount of yeast (d) the amount of sugar
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) size of the balloon (b) the water temperature (c) the amount of sugar
30. 30.True or false: warm water is needed for the yeast balloon. (a) True (b) False
31. 31.🍞 Which of these is something yeast does not need? (a) sunlight (b) warm water (c) sugar (d) time
32. 32.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) dry yeast (c) warm water (d) a battery cell
33. 33.True or false: a battery cell is not needed for the yeast balloon. (a) False (b) True
34. 34.True or false: sugar is needed for the yeast balloon. (a) False (b) True
35. 35.🍞 Which of these is something yeast does not need? (a) sugar (b) time (c) warm water (d) salt
36. 36.🧺 Do we need a magnet for the yeast balloon? (a) needed (b) not needed
37. 37.⚖️ 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) False (b) True
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a paper clip (c) dry yeast (d) a balloon
39. 39.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
40. 40.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it

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