Salt Crystal Experiment Worksheet

Science experiments lesson 18: Growing salt crystals · Set 226 · 40 questions

What you do (Dry out, crystals in): 1. An adult pours warm water into a cup. 2. Stir in salt, a spoon at a time, until no more dissolves. 3. Pour the salty water into a shallow dish and lay a string in it. 4. Leave it on a sunny windowsill, out of reach of small children, and check each day.

1. 1.🧈 Which of these is a change that cannot be undone? (a) folding paper (b) freezing water (c) baking a cake (d) melting ice
2. 2.🧺 Do we need a mirror for growing salt crystals? (a) not needed (b) needed
3. 3.🧺 Do we need salt for growing salt crystals? (a) needed (b) not needed
4. 4.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? Which of these is the one thing we change? (a) the kind of salt (b) the amount of water (c) sunny or shady place (d) days to see crystals
5. 5.True or false: rusting iron is a change that cannot be undone. (a) False (b) True
6. 6.🔍 Which is the odd one out? (a) food colour (b) glucose powder (c) baking soda (d) sand
7. 7.True or false: a magnet is not needed for growing salt crystals. (a) True (b) False
8. 8.True or false: a mirror is not needed for growing salt crystals. (a) False (b) True
9. 9.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a piece of string (b) a shallow dish (c) a spoon (d) a magnet
10. 10.🧂 Which of these does not dissolve in water? (a) glucose powder (b) cooking oil (c) sugar (d) food colour
11. 11.⚖️ 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 change it (b) we measure it (c) we keep it the same
12. 12.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a piece of string (b) a balloon (c) warm water (d) salt
13. 13.🔮 Predict: crystals grow slowly where nobody disturbs them. How big are they? (a) no crystals (b) bigger crystals (c) smaller crystals (d) liquid crystals
14. 14.🔍 Which is the odd one out? (a) sand (b) sawdust (c) glucose powder (d) cooking oil
15. 15.📘 What do we call a solution that cannot dissolve any more salt? (a) magnetic (b) empty (c) frozen (d) saturated
16. 16.🧺 Do we need a shallow dish for growing salt crystals? (a) not needed (b) needed
17. 17.True or false: warm water is not needed for growing salt crystals. (a) False (b) True
18. 18.True or false: cooking oil does not dissolve in water. (a) False (b) True
19. 19.True or false: cooking oil dissolves in water. (a) True (b) False
20. 20.True or false: warm water is needed for growing salt crystals. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) baking soda (b) chalk powder (c) glucose powder (d) food colour
22. 22.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? What do we do with “the amount of water”? (a) we measure it (b) we change it (c) we keep it the same
23. 23.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: the kind of salt is the one thing we change. (a) True (b) False
24. 24.True or false: turmeric powder is needed for growing salt crystals. (a) True (b) False
25. 25.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a spoon (b) warm water (c) yeast (d) a piece of string
26. 26.🔮 Predict: you cover the dish so no water can escape. What happens? (a) it turns sweet (b) few or no crystals (c) it fizzes (d) crystals grow faster
27. 27.True or false: a piece of string is needed for growing salt crystals. (a) True (b) False
28. 28.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? What do we do with “sunny or shady place”? (a) we keep it the same (b) we measure it (c) we change it
29. 29.🛟 Who should pour the warm water for the crystal experiment? (a) nobody needs to (b) a grown-up (c) a friend who is running (d) the youngest child
30. 30.🧂 What shape are table salt crystals under a magnifying glass? (a) tiny triangles (b) tiny stars (c) tiny cubes (d) tiny spheres
31. 31.🧂 Does food colour dissolve in water? (a) dissolves in water (b) does not dissolve
32. 32.🧺 Which of these is not needed for growing salt crystals? (a) a piece of string (b) a spoon (c) a magnet (d) salt
33. 33.True or false: sawdust does not dissolve in water. (a) False (b) True
34. 34.🧈 Can this change be undone: browning lemon ink? (a) cannot be undone (b) can be undone
35. 35.🌊 How is salt made in salt pans by the sea? (a) fish make it (b) salt rains down (c) sand is ground up (d) sea water evaporates
36. 36.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a piece of string (b) a spoon (c) warm water (d) a mirror
37. 37.🧂 Why do we stir in salt until no more will dissolve? (a) to cool the water (b) to change its colour (c) to make it very salty (d) to make it fizz
38. 38.🧂 Which of these dissolves in water? (a) sawdust (b) cooking oil (c) baking soda (d) small pebbles
39. 39.True or false: milk turning to curd is a change that can be undone. (a) True (b) False
40. 40.True or false: a battery cell is not needed for growing salt crystals. (a) True (b) False

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