Salt Crystal Experiment Worksheet

Science experiments lesson 18: Growing salt crystals · Set 45 · 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.True or false: yeast is needed for growing salt crystals. (a) True (b) False
2. 2.🧈 Which of these is a change that can be undone? (a) cooking an egg (b) melting ice (c) baking a cake (d) rusting iron
3. 3.🔮 Predict: you cover the dish so no water can escape. What happens? (a) it fizzes (b) few or no crystals (c) it turns sweet (d) crystals grow faster
4. 4.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? What do we do with “the same dish”? (a) we keep it the same (b) we change it (c) we measure it
5. 5.🧂 Which of these dissolves in water? (a) small pebbles (b) cooking oil (c) sugar (d) sand
6. 6.🧂 Why do crystals appear as the dish dries? (a) salt grows roots (b) the dish melts (c) water evaporates (d) salt eats water
7. 7.🧺 Do we need a shallow dish for growing salt crystals? (a) not needed (b) needed
8. 8.🧺 Do we need a magnet for growing salt crystals? (a) needed (b) not needed
9. 9.⚖️ 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
10. 10.⚖️ 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
11. 11.🌊 How is salt made in salt pans by the sea? (a) sand is ground up (b) salt rains down (c) fish make it (d) sea water evaporates
12. 12.⚖️ 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 measure it (b) we change it (c) we keep it the same
13. 13.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: days to see crystals is kept the same. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) table salt (b) sugar (c) food colour (d) sand
15. 15.⚖️ 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 measure it (c) we keep it the same
16. 16.🧂 Which of these dissolves in water? (a) cooking oil (b) glucose powder (c) chalk powder (d) sand
17. 17.🔍 Which is the odd one out? (a) chalk powder (b) food colour (c) table salt (d) glucose powder
18. 18.🧺 Do we need salt for growing salt crystals? (a) needed (b) not needed
19. 19.True or false: cooking an egg is a change that cannot be undone. (a) True (b) False
20. 20.True or false: a piece of string is not needed for growing salt crystals. (a) True (b) False
21. 21.True or false: baking a cake is a change that can be undone. (a) True (b) False
22. 22.🧺 Do we need a piece of string for growing salt crystals? (a) not needed (b) needed
23. 23.True or false: melting ice is a change that cannot be undone. (a) True (b) False
24. 24.🧂 What shape are table salt crystals under a magnifying glass? (a) tiny triangles (b) tiny spheres (c) tiny stars (d) tiny cubes
25. 25.True or false: freezing water is a change that can be undone. (a) True (b) False
26. 26.🧺 Do we need a battery cell for growing salt crystals? (a) not needed (b) needed
27. 27.🧂 Does baking soda dissolve in water? (a) dissolves in water (b) does not dissolve
28. 28.🧈 Can this change be undone: rusting iron? (a) can be undone (b) cannot be undone
29. 29.⚖️ 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) the kind of salt (c) the amount of water (d) days to see crystals
30. 30.🧂 Which of these does not dissolve in water? (a) food colour (b) chalk powder (c) sugar (d) table salt
31. 31.True or false: melting butter is a change that cannot be undone. (a) False (b) True
32. 32.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) yeast (b) warm water (c) salt (d) a piece of string
33. 33.🧈 Can this change be undone: browning lemon ink? (a) cannot be undone (b) can be undone
34. 34.🧺 Which of these is not needed for growing salt crystals? (a) a balloon (b) a piece of string (c) salt (d) warm water
35. 35.🧺 Which of these is not needed for growing salt crystals? (a) a piece of string (b) a spoon (c) a shallow dish (d) a mirror
36. 36.🧈 Which of these is a change that can be undone? (a) baking a cake (b) folding paper (c) cooking an egg (d) milk turning to curd
37. 37.🛟 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
38. 38.🛟 Who should pour the warm water for the crystal experiment? (a) a grown-up (b) the youngest child (c) a friend who is running (d) nobody needs to
39. 39.True or false: sand dissolves in water. (a) False (b) True
40. 40.🧺 Which of these is not needed for growing salt crystals? (a) salt (b) a spoon (c) warm water (d) a battery cell

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