Kitchen Chemistry Experiments Test Worksheet

Science experiments lesson 20: Part 2 test: kitchen chemistry and life · Set 77 · 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.📘 The browning of lemon juice with heat is a ___ change. (a) physical (b) chemical (c) magnetic (d) musical
2. 2.🔍 Which is the odd one out? (a) sunlight (b) water (c) warmth (d) air
3. 3.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? Which of these is kept the same? (a) sunny or shady place (b) days to see crystals (c) the same dish
4. 4.⚖️ Fair test — which liquids turn turmeric paper reddish-brown? True or false: the number of drops is kept the same. (a) False (b) True
5. 5.⚖️ Fair test — does lemon juice or orange juice make darker secret writing? Which of these is the one thing we change? (a) the same paper (b) the ironing time (c) the kind of juice (d) the same cotton bud
6. 6.🧺 Do we need a balloon for the secret lemon message? (a) needed (b) not needed
7. 7.🫧 Is sugar water an acid, a base or neutral? (a) a base (b) neutral (c) an acid
8. 8.🧺 Do we need a battery cell for the muddy water filter? (a) needed (b) not needed
9. 9.🔮 Predict: sprouts grow in the dark for a week. What colour are their leaves? (a) bright red (b) pale yellow (c) blue (d) dark green
10. 10.⚖️ Fair test — which liquids turn turmeric paper reddish-brown? True or false: the liquid we test is what we measure. (a) False (b) True
11. 11.🧺 Do we need dry yeast for the yeast balloon? (a) not needed (b) needed
12. 12.🧺 Three of these are needed for making butter. Which one is NOT needed? (a) fresh cream (b) cold water to rinse (c) a battery cell (d) a timer
13. 13.🔍 Which is the odd one out? (a) plain water (b) baking soda water (c) soap solution (d) detergent water
14. 14.🧺 Do we need cold water to rinse for making butter? (a) not needed (b) needed
15. 15.🧺 Three of these are needed for the muddy water filter. Which one is NOT needed? (a) muddy water (b) cotton or cloth (c) a clean glass (d) a mirror
16. 16.🧺 Do we need a shallow dish for growing salt crystals? (a) needed (b) not needed
17. 17.🔍 Which is the odd one out? (a) letting the paper dry (b) writing the message (c) reading the message (d) ironing the paper
18. 18.⚖️ Fair test — does lemon juice or orange juice make darker secret writing? Which of these is kept the same? (a) the kind of juice (b) the iron setting (c) how dark the writing is
19. 19.🧺 Do we need yeast for the turmeric test? (a) not needed (b) needed
20. 20.🛟 Which safety rule fits the fizzy balloon experiment? (a) seal it in a glass jar (b) keep it away from eyes (c) put it in your mouth (d) shake it near your face
21. 21.📘 Is the fizzing a sign that a new substance is made? (a) no, nothing changes (b) yes, a new gas forms (c) it is only melting (d) it is only dissolving
22. 22.⚖️ Fair test — which liquids turn turmeric paper reddish-brown? Which of these is what we measure? (a) the liquid we test (b) the colour we see (c) the turmeric paper (d) the number of drops
23. 23.🧺 Which of these is needed for the muddy water filter? (a) a battery cell (b) a balloon (c) turmeric powder (d) a clean glass
24. 24.🟡 Turmeric paper meets plain water. What happens? (a) turns reddish-brown (b) stays yellow
25. 25.🫧 Is curd an acid, a base or neutral? (a) neutral (b) an acid (c) a base
26. 26.True or false: yeast is not needed for sprouting seeds. (a) True (b) False
27. 27.🫧 Is salt water an acid, a base or neutral? (a) an acid (b) a base (c) neutral
28. 28.True or false: a mirror is needed for sprouting seeds. (a) False (b) True
29. 29.🪴 Which part of a plant does this job: make food in sunlight? (a) leaves (b) roots (c) stem (d) flower
30. 30.🧂 Which of these does not dissolve in water? (a) glucose powder (b) chalk powder (c) baking soda (d) sugar
31. 31.🌱 Is sugar needed for a seed to sprout? (a) not needed to sprout (b) needed to sprout
32. 32.🫗 Which of these is done by sieving? (a) salt from sea water (b) bran from wheat flour (c) bad grains from rice (d) husk from rice grain
33. 33.🧺 Three of these are needed for the turmeric test. Which one is NOT needed? (a) a mirror (b) soap solution (c) a dropper or spoon (d) turmeric powder
34. 34.True or false: lemon juice is neutral. (a) False (b) True
35. 35.🧈 Why does shaking cream make butter? (a) fat bits stick together (b) shaking adds salt (c) the lid is warm (d) the jar adds butter
36. 36.True or false: vinegar is neutral. (a) False (b) True
37. 37.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is smaller (b) the balloon is bigger (c) it shrinks to nothing (d) it turns to bread
38. 38.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) ice cold (d) very salty
39. 39.⚖️ Fair test — does a cloth filter or a cotton filter give clearer water? What do we do with “the amount poured”? (a) we keep it the same (b) we measure it (c) we change it
40. 40.True or false: boiled seeds sprouts in a few days. (a) True (b) False

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