Salt Crystal Experiment Worksheet

Science experiments lesson 18: Growing salt crystals · Set 676 · 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.🔮 Predict: you cover the dish so no water can escape. What happens? (a) crystals grow faster (b) few or no crystals (c) it turns sweet (d) it fizzes
2. 2.🧂 Why do we stir in salt until no more will dissolve? (a) to cool the water (b) to make it fizz (c) to make it very salty (d) to change its colour
3. 3.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a shallow dish (b) warm water (c) a balloon (d) salt
4. 4.🧈 Can this change be undone: browning lemon ink? (a) can be undone (b) cannot be undone
5. 5.🧈 Which of these is a change that cannot be undone? (a) milk turning to curd (b) dissolving salt (c) melting ice (d) folding paper
6. 6.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: sunny or shady place is the one thing we change. (a) True (b) False
7. 7.🧂 Why do crystals appear as the dish dries? (a) water evaporates (b) salt grows roots (c) the dish melts (d) salt eats water
8. 8.True or false: folding paper is a change that cannot be undone. (a) True (b) False
9. 9.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? What do we do with “days to see crystals”? (a) we change it (b) we keep it the same (c) we measure it
10. 10.🔮 Predict: you use sugar instead of salt. What happens as it dries? (a) it turns to oil (b) it turns to butter (c) sugar crystals form (d) salt crystals form
11. 11.🧈 Which of these is a change that can be undone? (a) browning lemon ink (b) folding paper (c) baking a cake (d) cooking an egg
12. 12.True or false: cooking an egg is a change that can be undone. (a) True (b) False
13. 13.🧺 Which of these is not needed for growing salt crystals? (a) a piece of string (b) salt (c) a spoon (d) a balloon
14. 14.🛟 Where should you keep the crystal dish while it dries? (a) next to the baby (b) in a busy doorway (c) safe from small children (d) on the edge of a table
15. 15.🌊 How is salt made in salt pans by the sea? (a) sand is ground up (b) fish make it (c) sea water evaporates (d) salt rains down
16. 16.🧈 Which of these is a change that can be undone? (a) melting butter (b) milk turning to curd (c) rusting iron (d) baking a cake
17. 17.🧺 Which of these is not needed for growing salt crystals? (a) warm water (b) a piece of string (c) salt (d) yeast
18. 18.🧂 Does table salt dissolve in water? (a) dissolves in water (b) does not dissolve
19. 19.True or false: freezing water is a change that cannot be undone. (a) True (b) False
20. 20.🧺 Do we need a battery cell for growing salt crystals? (a) not needed (b) needed
21. 21.🔮 Predict: crystals grow slowly where nobody disturbs them. How big are they? (a) bigger crystals (b) liquid crystals (c) smaller crystals (d) no crystals
22. 22.🧺 Do we need a shallow dish for growing salt crystals? (a) needed (b) not needed
23. 23.True or false: sugar dissolves in water. (a) False (b) True
24. 24.🧺 Do we need a piece of string for growing salt crystals? (a) needed (b) not needed
25. 25.🧈 Can this change be undone: rusting iron? (a) can be undone (b) cannot be undone
26. 26.📘 What do we call a solution that cannot dissolve any more salt? (a) frozen (b) saturated (c) empty (d) magnetic
27. 27.True or false: turmeric powder is not needed for growing salt crystals. (a) True (b) False
28. 28.🧺 Which of these is needed for growing salt crystals? (a) salt (b) turmeric powder (c) a battery cell (d) yeast
29. 29.🧺 Do we need warm water for growing salt crystals? (a) needed (b) not needed
30. 30.⚖️ 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
31. 31.⚖️ 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
32. 32.🧂 Does sawdust dissolve in water? (a) does not dissolve (b) dissolves in water
33. 33.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) warm water (b) a spoon (c) salt (d) a mirror
34. 34.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: the amount of salt is what we measure. (a) True (b) False
35. 35.🧂 What shape are table salt crystals under a magnifying glass? (a) tiny triangles (b) tiny spheres (c) tiny cubes (d) tiny stars
36. 36.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a magnet (b) a piece of string (c) a shallow dish (d) a spoon
37. 37.🧺 Do we need a spoon for growing salt crystals? (a) not needed (b) needed
38. 38.🧂 Which of these dissolves in water? (a) sawdust (b) small pebbles (c) food colour (d) sand
39. 39.🧈 Can this change be undone: melting butter? (a) cannot be undone (b) can be undone
40. 40.True or false: a magnet is not needed for growing salt crystals. (a) False (b) True

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