Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 920 · 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.True or false: a magnet is something yeast does not need. (a) True (b) False
2. 2.True or false: sunlight is something yeast needs. (a) False (b) True
3. 3.True or false: time is something yeast needs. (a) False (b) True
4. 4.🍞 Which of these is something yeast does not need? (a) warm water (b) time (c) sunlight (d) sugar
5. 5.🔍 Which is the odd one out? (a) sugar (b) time (c) a magnet (d) warm water
6. 6.True or false: vinegar is something yeast needs. (a) False (b) True
7. 7.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows much faster (b) it turns yellow (c) it bursts at once (d) it grows very little
8. 8.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a mirror (c) sugar (d) dry yeast
9. 9.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
10. 10.🧺 Which of these is needed for the yeast balloon? (a) a paper clip (b) a battery cell (c) a small bottle (d) turmeric powder
11. 11.🛟 The water for the yeast should be ___. (a) ice cold (b) boiling hot (c) warm, not hot (d) very salty
12. 12.🔍 Which is the odd one out? (a) salt (b) time (c) a magnet (d) vinegar
13. 13.🔍 Which is the odd one out? (a) time (b) salt (c) warm water (d) sugar
14. 14.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
15. 15.🛟 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
16. 16.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
17. 17.⚖️ 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
18. 18.⚖️ 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
19. 19.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
20. 20.True or false: warm water is something yeast needs. (a) False (b) True
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
22. 22.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a mirror (c) turmeric powder (d) warm water
23. 23.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) it shrinks to nothing (c) the balloon is bigger (d) it turns to bread
24. 24.True or false: sugar is needed for the yeast balloon. (a) False (b) True
25. 25.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) the yeast is killed (c) it turns to sugar (d) it glows
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True
27. 27.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) sugar (c) a small bottle (d) a balloon
28. 28.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
29. 29.🍞 Why do we add sugar to the yeast? (a) it is food for yeast (b) to make it heavy (c) to make it sweet (d) to colour it
30. 30.True or false: a comb is needed for the yeast balloon. (a) False (b) True
31. 31.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to wash dishes (d) to make bread rise
32. 32.True or false: vinegar is something yeast does not need. (a) True (b) False
33. 33.⚖️ 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
34. 34.True or false: sugar is something yeast does not need. (a) False (b) True
35. 35.🍞 Which of these is something yeast needs? (a) salt (b) sunlight (c) vinegar (d) sugar
36. 36.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
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 the one thing we change. (a) True (b) False
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a battery cell (c) a balloon (d) a small bottle
39. 39.⚖️ 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 yeast (b) size of the balloon (c) the amount of water (d) the water temperature
40. 40.⚖️ 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 water temperature (c) the amount of water (d) the same bottles

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