Kitchen Chemistry Experiments Test Worksheet

Science experiments lesson 20: Part 2 test: kitchen chemistry and life · Set 216 · 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.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a paper clip (c) a small bottle (d) a battery cell
2. 2.🍋 Secret message: who does this step — writing the message? (a) a child can do it (b) an adult does it
3. 3.🔮 Predict: you use sugar instead of salt. What happens as it dries? (a) salt crystals form (b) sugar crystals form (c) it turns to butter (d) it turns to oil
4. 4.🧺 Three of these are needed for the fizzy balloon. Which one is NOT needed? (a) a balloon (b) vinegar (c) a seed (d) an empty bottle
5. 5.⚖️ Fair test — which liquids turn turmeric paper reddish-brown? Which of these is the one thing we change? (a) the number of drops (b) the light we look in (c) the turmeric paper (d) the liquid we test
6. 6.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? Which of these is kept the same? (a) the amount of water (b) days to see crystals (c) sunny or shady place
7. 7.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: size of the balloon is the one thing we change. (a) False (b) True
8. 8.🧺 Three of these are needed for the fizzy balloon. Which one is NOT needed? (a) sugar (b) an empty bottle (c) a balloon (d) a tray for spills
9. 9.True or false: sunlight is needed for the leafy bag test. (a) False (b) True
10. 10.True or false: milk turning to curd is a change that can be undone. (a) True (b) False
11. 11.🍋 Which of these steps is a job for an adult? (a) dipping the cotton bud (b) writing the message (c) letting the paper dry (d) putting the iron away
12. 12.🧺 Do we need sunlight for the leafy bag test? (a) not needed (b) needed
13. 13.⚖️ Fair test — do seeds need water to sprout? Which of these is kept the same? (a) wet or dry cotton (b) the number of seeds (c) how many seeds sprout
14. 14.True or false: tamarind water is an acid. (a) False (b) True
15. 15.🧺 Do we need turmeric powder for the yeast balloon? (a) not needed (b) needed
16. 16.🔍 Muddy water is left still for an hour. What happens to the mud? (a) it dissolves (b) it floats on top (c) it turns to sand (d) it sinks to the bottom
17. 17.🛟 What should you do if vinegar splashes in your eye? (a) rinse with clean water (b) rub it hard (c) add baking soda (d) ignore it
18. 18.🧺 Which of these is not needed for the secret lemon message? (a) an adult with an iron (b) lemon juice (c) a battery cell (d) white paper
19. 19.🍋 A drop of lemon juice falls on turmeric paper. What happens? (a) it stays yellow (b) it turns black (c) it turns blue (d) it turns red
20. 20.🧂 What shape are table salt crystals under a magnifying glass? (a) tiny stars (b) tiny cubes (c) tiny triangles (d) tiny spheres
21. 21.⚖️ 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
22. 22.⚖️ Fair test — do seeds need water to sprout? True or false: the same place is the one thing we change. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) baking a cake (b) dissolving salt (c) browning lemon ink (d) cooking an egg
24. 24.True or false: melting butter is a change that can be undone. (a) False (b) True
25. 25.🔮 Predict: you filter salty water through cloth. Does the salt stay on the cloth? (a) it turns to sugar (b) no, salt passes through (c) it turns to sand (d) yes, all of it
26. 26.True or false: a battery cell is not needed for making butter. (a) True (b) False
27. 27.🟡 Which of these turns turmeric reddish-brown? (a) soap solution (b) plain water (c) salt water (d) tamarind water
28. 28.🧺 Three of these are needed for making butter. Which one is NOT needed? (a) fresh cream (b) a balloon (c) a jar with a tight lid (d) cold water to rinse
29. 29.True or false: ironing the paper is a job a child can do. (a) False (b) True
30. 30.🌱 Is sugar needed for a seed to sprout? (a) not needed to sprout (b) needed to sprout
31. 31.True or false: a balloon is not needed for the fizzy balloon. (a) True (b) False
32. 32.⚖️ 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 amount of yeast (c) the water temperature
33. 33.⚖️ 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) the cream temperature (c) time to make butter
34. 34.True or false: plain water is a base. (a) True (b) False
35. 35.🛟 What should you do after handling muddy water? (a) lick your fingers (b) wash hands afterwards (c) nothing is needed (d) wipe hands on face
36. 36.🧈 Can this change be undone: baking a cake? (a) can be undone (b) cannot be undone
37. 37.True or false: a piece of string is needed for growing salt crystals. (a) True (b) False
38. 38.🛟 Where should you keep the crystal dish while it dries? (a) in a busy doorway (b) safe from small children (c) next to the baby (d) on the edge of a table
39. 39.True or false: a comb is not needed for the fizzy balloon. (a) True (b) False
40. 40.🍋 Which of these steps is a job for an adult? (a) writing the message (b) letting the paper dry (c) dipping the cotton bud (d) cutting the lemon

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