Yeast Balloon Experiment Worksheet

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

Free science experiments lessons, practice and worksheets at talentjr.in/science-experiments-for-kids