Kitchen Chemistry Experiments Test Worksheet

Science experiments lesson 20: Part 2 test: kitchen chemistry and life · Set 128 · 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.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
2. 2.True or false: tamarind water is neutral. (a) False (b) True
3. 3.⚖️ Fair test — which liquids turn turmeric paper reddish-brown? What do we do with “the light we look in”? (a) we change it (b) we measure it (c) we keep it the same
4. 4.True or false: yeast is needed for sprouting seeds. (a) True (b) False
5. 5.🛟 Who should pour the warm water for the crystal experiment? (a) a friend who is running (b) a grown-up (c) the youngest child (d) nobody needs to
6. 6.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) it is food for yeast (c) to make it sweet (d) to colour it
7. 7.🔮 Predict: you write with plain water instead of lemon juice. What appears after ironing? (a) almost nothing (b) dark brown words (c) blue words (d) a rainbow
8. 8.🫗 Muddy water is poured through a cloth filter. What stays on the cloth? (a) the salt (b) the water (c) nothing (d) the mud
9. 9.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
10. 10.🪴 Which part of a plant does this job: hold the plant in soil? (a) stem (b) roots (c) flower (d) leaves
11. 11.🧺 Do we need baking soda for the fizzy balloon? (a) needed (b) not needed
12. 12.⚖️ Fair test — which liquids turn turmeric paper reddish-brown? What do we do with “the turmeric paper”? (a) we keep it the same (b) we change it (c) we measure it
13. 13.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) the amount of water (b) the water temperature (c) size of the balloon (d) the amount of yeast
14. 14.🔮 Predict: turmeric paper is dipped in baking soda water. What colour does it turn? (a) it turns blue (b) it stays yellow (c) reddish-brown (d) it turns green
15. 15.🧈 Can this change be undone: baking a cake? (a) can be undone (b) cannot be undone
16. 16.🧺 Which of these is not needed for the secret lemon message? (a) lemon juice (b) a cotton bud (c) turmeric powder (d) an adult with an iron
17. 17.⚖️ Fair test — does a plant in the sun give out more water than one in the shade? Which of these is kept the same? (a) amount of water drops (b) the time we wait (c) sun or shade
18. 18.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it turns yellow (b) it bursts at once (c) it grows very little (d) it grows much faster
19. 19.🧺 Which of these is needed for growing salt crystals? (a) a magnet (b) turmeric powder (c) a shallow dish (d) a battery cell
20. 20.🛟 Who should use the hot iron in the secret message experiment? (a) the youngest child (b) only an adult (c) whoever is fastest (d) any child
21. 21.True or false: rusting iron is a change that can be undone. (a) True (b) False
22. 22.True or false: vinegar is neutral. (a) False (b) True
23. 23.🧺 Which of these is not needed for the yeast balloon? (a) a magnet (b) warm water (c) dry yeast (d) a balloon
24. 24.⚖️ 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 amount of salt (b) sunny or shady place (c) the kind of salt (d) days to see crystals
25. 25.🍋 Which of these steps is a job for an adult? (a) reading the message (b) plugging in the iron (c) letting the paper dry (d) dipping the cotton bud
26. 26.⚖️ Fair test — does more baking soda blow the balloon up bigger? True or false: the kind of balloon is kept the same. (a) True (b) False
27. 27.True or false: curd is an acid. (a) False (b) True
28. 28.🪴 Which part of a plant does this job: give out water vapour? (a) stem (b) flower (c) roots (d) leaves
29. 29.⚖️ Fair test — does a plant in the sun give out more water than one in the shade? True or false: sun or shade is the one thing we change. (a) False (b) True
30. 30.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) turmeric powder (c) a balloon (d) warm water
31. 31.🎈 Why does the balloon blow up? (a) vinegar is hot (b) gas is made inside (c) outside air gets in (d) the bottle shrinks
32. 32.🍋 What colour does the lemon writing turn when an adult warms it? (a) white (b) green (c) brown (d) blue
33. 33.🔍 Which is the odd one out? (a) baking soda (b) table salt (c) food colour (d) sawdust
34. 34.🔮 Predict: you use plain water instead of vinegar. What happens? (a) a huge eruption (b) the balloon bursts (c) very little fizzing (d) it turns to honey
35. 35.🧺 Do we need a mirror for making butter? (a) not needed (b) needed
36. 36.⚖️ 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 kind of salt
37. 37.⚖️ Fair test — does a cloth filter or a cotton filter give clearer water? Which of these is what we measure? (a) the same glass (b) the filter material (c) how clear the water is (d) the amount poured
38. 38.🟡 Turmeric paper meets detergent water. What happens? (a) turns reddish-brown (b) stays yellow
39. 39.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a shallow dish (b) warm water (c) a mirror (d) salt
40. 40.🧺 Do we need a bowl for making butter? (a) not needed (b) needed

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