Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 239 · 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 of these is something yeast needs? (a) salt (b) a magnet (c) sunlight (d) sugar
2. 2.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to make bread rise (c) to wash dishes (d) to colour rice
3. 3.True or false: warm water is something yeast does not need. (a) True (b) False
4. 4.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
5. 5.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) the yeast is killed (d) it glows
6. 6.True or false: sunlight is something yeast does not need. (a) False (b) True
7. 7.True or false: a paper clip is not needed for the yeast balloon. (a) False (b) True
8. 8.⚖️ 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 change it (c) we measure it
9. 9.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
10. 10.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it turns yellow (d) it grows very little
11. 11.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
12. 12.🍞 Does yeast need sugar to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) dry yeast (c) a magnet (d) a small bottle
14. 14.🍞 Which of these is something yeast does not need? (a) warm water (b) sugar (c) a magnet (d) time
15. 15.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) put it in your mouth (d) pour it down the sink
16. 16.🧺 Which of these is needed for the yeast balloon? (a) a magnet (b) a paper clip (c) a small bottle (d) a comb
17. 17.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
18. 18.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to make it sweet (c) to colour it (d) it is food for yeast
19. 19.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
20. 20.⚖️ 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) size of the balloon (b) the amount of water (c) the same bottles (d) the water temperature
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) turmeric powder (d) a small bottle
22. 22.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
23. 23.⚖️ 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 change it (b) we measure it (c) we keep it the same
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) sugar (c) a small bottle (d) a mirror
25. 25.⚖️ 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) size of the balloon (c) the amount of sugar
26. 26.⚖️ 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
27. 27.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) warm water (c) a battery cell (d) a magnet
28. 28.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a comb (d) warm water
29. 29.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
30. 30.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
31. 31.📘 What is yeast? (a) a tiny living fungus (b) a kind of stone (c) a kind of salt (d) a kind of sugar
32. 32.True or false: a magnet is not needed for the yeast balloon. (a) True (b) False
33. 33.True or false: warm water is not needed for the yeast balloon. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) sugar (b) warm water (c) salt (d) time
35. 35.⚖️ 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 water
36. 36.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) turmeric powder (b) warm water (c) a balloon (d) a small bottle
37. 37.True or false: a magnet is needed for the yeast balloon. (a) False (b) True
38. 38.True or false: time is something yeast needs. (a) False (b) True
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is what we measure. (a) True (b) False
40. 40.True or false: a balloon is not needed for the yeast balloon. (a) True (b) False

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