Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 850 · 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.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
2. 2.🍞 Which of these is something yeast needs? (a) a magnet (b) salt (c) sugar (d) sunlight
3. 3.True or false: sugar is something yeast needs. (a) False (b) True
4. 4.True or false: vinegar is something yeast needs. (a) False (b) True
5. 5.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it glows (b) the yeast is killed (c) it grows faster (d) it turns to sugar
6. 6.🔍 Which is the odd one out? (a) time (b) salt (c) sugar (d) warm water
7. 7.🍞 Where is yeast used in the kitchen? (a) to clean floors (b) to wash dishes (c) to make bread rise (d) to colour rice
8. 8.True or false: a balloon is not needed for the yeast balloon. (a) False (b) True
9. 9.🧺 Do we need a balloon for the yeast balloon? (a) needed (b) not needed
10. 10.🛟 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
11. 11.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) False (b) True
12. 12.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.⚖️ 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 measure it (c) we change it
14. 14.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) dry yeast (c) a small bottle (d) warm water
15. 15.⚖️ 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
16. 16.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
17. 17.🧺 Which of these is needed for the yeast balloon? (a) dry yeast (b) a comb (c) a magnet (d) a paper clip
18. 18.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it turns yellow (c) it grows much faster (d) it grows very little
19. 19.🧺 Which of these is needed for the yeast balloon? (a) a mirror (b) a balloon (c) turmeric powder (d) a comb
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) the amount of sugar (b) the amount of yeast (c) the water temperature (d) the same bottles
21. 21.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the amount of water (b) size of the balloon (c) the water temperature
22. 22.🧺 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 balloon
23. 23.🔍 Which is the odd one out? (a) time (b) vinegar (c) sugar (d) warm water
24. 24.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) a comb (d) dry yeast
25. 25.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) dry yeast (c) a comb (d) a balloon
26. 26.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) sugar (b) a small bottle (c) dry yeast (d) turmeric powder
27. 27.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold kills sugar (d) cold slows yeast down
28. 28.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
29. 29.🍞 Does yeast need warm water to make gas? (a) yeast needs it (b) yeast does not need it
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) warm water (b) a battery cell (c) dry yeast (d) a small bottle
31. 31.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
32. 32.⚖️ 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 measure it (b) we change it (c) we keep it the same
33. 33.🍞 Which of these is something yeast does not need? (a) time (b) sugar (c) warm water (d) salt
34. 34.⚖️ 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
35. 35.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
36. 36.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a mirror (c) sugar (d) a balloon
37. 37.True or false: sugar is something yeast does not need. (a) False (b) True
38. 38.⚖️ 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) False (b) True
39. 39.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a small bottle (d) a mirror
40. 40.True or false: turmeric powder is needed for the yeast balloon. (a) False (b) True

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