Salt Crystal Experiment Worksheet

Science experiments lesson 18: Growing salt crystals · Set 917 · 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.🧂 Why do crystals appear as the dish dries? (a) the dish melts (b) salt eats water (c) water evaporates (d) salt grows roots
2. 2.🧈 Can this change be undone: melting ice? (a) can be undone (b) cannot be undone
3. 3.🧈 Can this change be undone: rusting iron? (a) can be undone (b) cannot be undone
4. 4.⚖️ 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) the kind of salt (c) days to see crystals
5. 5.🧈 Can this change be undone: browning lemon ink? (a) can be undone (b) cannot be undone
6. 6.🧂 What shape are table salt crystals under a magnifying glass? (a) tiny spheres (b) tiny cubes (c) tiny triangles (d) tiny stars
7. 7.True or false: salt is not needed for growing salt crystals. (a) True (b) False
8. 8.🧂 Does glucose powder dissolve in water? (a) dissolves in water (b) does not dissolve
9. 9.🧂 Which of these does not dissolve in water? (a) food colour (b) sand (c) glucose powder (d) table salt
10. 10.🛟 Who should pour the warm water for the crystal experiment? (a) nobody needs to (b) a friend who is running (c) a grown-up (d) the youngest child
11. 11.🧂 Does small pebbles dissolve in water? (a) does not dissolve (b) dissolves in water
12. 12.⚖️ 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 keep it the same (b) we measure it (c) we change it
13. 13.True or false: salt is needed for growing salt crystals. (a) True (b) False
14. 14.🧂 Does cooking oil dissolve in water? (a) does not dissolve (b) dissolves in water
15. 15.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: the same dish is kept the same. (a) False (b) True
16. 16.True or false: a mirror is not needed for growing salt crystals. (a) True (b) False
17. 17.True or false: a magnet is not needed for growing salt crystals. (a) False (b) True
18. 18.🛟 Where should you keep the crystal dish while it dries? (a) safe from small children (b) in a busy doorway (c) on the edge of a table (d) next to the baby
19. 19.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? What do we do with “the kind of salt”? (a) we measure it (b) we keep it the same (c) we change it
20. 20.⚖️ 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 amount of water (b) sunny or shady place (c) days to see crystals (d) the kind of salt
21. 21.🧺 Do we need a shallow dish for growing salt crystals? (a) needed (b) not needed
22. 22.🔍 Which is the odd one out? (a) sugar (b) baking soda (c) food colour (d) cooking oil
23. 23.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? Which of these is what we measure? (a) sunny or shady place (b) days to see crystals (c) the same dish (d) the kind of salt
24. 24.🧈 Which of these is a change that can be undone? (a) browning lemon ink (b) cooking an egg (c) folding paper (d) rusting iron
25. 25.⚖️ 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 amount of water
26. 26.🧈 Which of these is a change that cannot be undone? (a) baking a cake (b) melting ice (c) freezing water (d) melting butter
27. 27.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a battery cell (b) a shallow dish (c) a piece of string (d) salt
28. 28.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a spoon (b) a magnet (c) a shallow dish (d) a piece of string
29. 29.True or false: food colour dissolves in water. (a) True (b) False
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.🧈 Which of these is a change that cannot be undone? (a) melting ice (b) dissolving salt (c) folding paper (d) cooking an egg
32. 32.🔮 Predict: you cover the dish so no water can escape. What happens? (a) it fizzes (b) few or no crystals (c) crystals grow faster (d) it turns sweet
33. 33.🧂 Which of these does not dissolve in water? (a) small pebbles (b) baking soda (c) glucose powder (d) sugar
34. 34.True or false: cooking an egg is a change that can be undone. (a) False (b) True
35. 35.⚖️ 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 change it (b) we measure it (c) we keep it the same
36. 36.🧂 Does food colour dissolve in water? (a) dissolves in water (b) does not dissolve
37. 37.🧈 Which of these is a change that can be undone? (a) browning lemon ink (b) melting butter (c) cooking an egg (d) baking a cake
38. 38.🧂 Which of these does not dissolve in water? (a) food colour (b) baking soda (c) sawdust (d) sugar
39. 39.🧺 Which of these is needed for growing salt crystals? (a) a mirror (b) a balloon (c) a battery cell (d) a piece of string
40. 40.🧂 Why do we stir in salt until no more will dissolve? (a) to make it fizz (b) to make it very salty (c) to cool the water (d) to change its colour

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