Kitchen Chemistry Experiments Test Worksheet

Science experiments lesson 20: Part 2 test: kitchen chemistry and life · Set 703 · 40 questions

What you do (Find the experiment, use the idea): 1. Read the question and find its experiment. 2. Use that experiment’s idea — acid and base, indicator colours, chemical change, what seeds and yeast need, transpiration, crystals or filtering. 3. For a fair-test question, find what is changed, kept the same and measured. 4. For a safety question, choose what keeps everyone safe.

1. 1.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold kills sugar (d) cold water is heavy
2. 2.🔍 Which is the odd one out? (a) detergent water (b) curd (c) lemon juice (d) tamarind water
3. 3.⚖️ Fair test — do seeds need water to sprout? True or false: the number of seeds is kept the same. (a) True (b) False
4. 4.🫗 How do we separate bran from wheat flour? (a) filtering (b) sieving (c) evaporating (d) winnowing
5. 5.🧺 Do we need water for the turmeric test? (a) needed (b) not needed
6. 6.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
7. 7.True or false: soil is needed for a seed to sprout. (a) True (b) False
8. 8.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? What do we do with “the same dish”? (a) we change it (b) we keep it the same (c) we measure it
9. 9.True or false: a comb is needed for the yeast balloon. (a) False (b) True
10. 10.🫧 Which of these is an acid? (a) soap solution (b) baking soda water (c) vinegar (d) detergent water
11. 11.⚖️ Fair test — does more baking soda blow the balloon up bigger? True or false: the kind of balloon is what we measure. (a) False (b) True
12. 12.🔮 The fizzing stops after a while. Why? (a) the gas froze (b) the balloon got cold (c) the bottle got tired (d) an ingredient ran out
13. 13.🧈 Which of these is a change that can be undone? (a) cooking an egg (b) milk turning to curd (c) melting ice (d) browning lemon ink
14. 14.🛟 The water for the yeast should be ___. (a) boiling hot (b) ice cold (c) very salty (d) warm, not hot
15. 15.⚖️ Fair test — which liquids turn turmeric paper reddish-brown? True or false: the light we look in is the one thing we change. (a) True (b) False
16. 16.🧺 Three of these are needed for making butter. Which one is NOT needed? (a) fresh cream (b) a mirror (c) cold water to rinse (d) a bowl
17. 17.True or false: a battery cell is needed for the muddy water filter. (a) True (b) False
18. 18.🔮 Predict: you tie a bag on a branch with no leaves. Will it collect much water? (a) it fills with soil (b) much less water (c) exactly the same (d) much more water
19. 19.⚖️ Fair test — does cold cream turn into butter faster than warm cream? Which of these is kept the same? (a) the amount of cream (b) time to make butter (c) the cream temperature
20. 20.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? What do we do with “the amount of salt”? (a) we measure it (b) we keep it the same (c) we change it
21. 21.True or false: plain water is a base. (a) False (b) True
22. 22.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) the yeast is killed (b) it grows faster (c) it glows (d) it turns to sugar
23. 23.⚖️ Fair test — which liquids turn turmeric paper reddish-brown? What do we do with “the liquid we test”? (a) we measure it (b) we change it (c) we keep it the same
24. 24.🧺 Do we need a clear plastic bag for the leafy bag test? (a) not needed (b) needed
25. 25.🔮 Predict: turmeric paper is dipped in baking soda water. What colour does it turn? (a) reddish-brown (b) it turns green (c) it turns blue (d) it stays yellow
26. 26.🌱 Which of these does not sprout? (a) wet seeds in the dark (b) seeds on wet cotton (c) wet seeds by a window (d) seeds in the freezer
27. 27.🫧 Is tamarind water an acid, a base or neutral? (a) a base (b) neutral (c) an acid
28. 28.🧺 Three of these are needed for the turmeric test. Which one is NOT needed? (a) soap solution (b) turmeric powder (c) water (d) a magnet
29. 29.🫧 Is plain water an acid, a base or neutral? (a) a base (b) an acid (c) neutral
30. 30.🔮 Predict: you pour muddy water through two layers of cloth instead of one. The water comes out ___. (a) salty (b) clearer (c) muddier (d) hot
31. 31.🍋 Secret message: who does this step — ironing the paper? (a) an adult does it (b) a child can do it
32. 32.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? Which of these is what we measure? (a) the kind of salt (b) days to see crystals (c) sunny or shady place (d) the amount of water
33. 33.True or false: dissolving salt is a change that can be undone. (a) True (b) False
34. 34.🛟 Turmeric stains clothes. What should you wear? (a) a white party dress (b) an old shirt or apron (c) your best clothes (d) your school uniform
35. 35.🔮 Predict: tea is poured through a strainer. What happens to the tea leaves? (a) leaves pass through (b) tea stays behind (c) both stay behind (d) leaves stay behind
36. 36.True or false: an adult with an iron is needed for the secret lemon message. (a) True (b) False
37. 37.True or false: sugar is something yeast does not need. (a) True (b) False
38. 38.True or false: a rubber band is needed for the leafy bag test. (a) True (b) False
39. 39.True or false: turmeric powder is not needed for the muddy water filter. (a) False (b) True
40. 40.🧺 Which of these is needed for making butter? (a) fresh cream (b) turmeric powder (c) a balloon (d) a magnet

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