Salt Crystal Experiment Worksheet

Science experiments lesson 18: Growing salt crystals · Set 870 · 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) few or no crystals (b) crystals grow faster (c) it fizzes (d) it turns sweet
2. 2.True or false: table salt dissolves in water. (a) True (b) False
3. 3.⚖️ 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
4. 4.⚖️ 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 kind of salt (b) the amount of salt (c) days to see crystals (d) the same dish
5. 5.🔮 Predict: you use sugar instead of salt. What happens as it dries? (a) salt crystals form (b) sugar crystals form (c) it turns to oil (d) it turns to butter
6. 6.🛟 Where should you keep the crystal dish while it dries? (a) safe from small children (b) next to the baby (c) in a busy doorway (d) on the edge of a table
7. 7.True or false: freezing water is a change that cannot be undone. (a) False (b) True
8. 8.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: the same dish is what we measure. (a) True (b) False
9. 9.🧂 Why do we stir in salt until no more will dissolve? (a) to change its colour (b) to make it very salty (c) to cool the water (d) to make it fizz
10. 10.True or false: baking a cake is a change that cannot be undone. (a) False (b) True
11. 11.🧺 Do we need a shallow dish for growing salt crystals? (a) not needed (b) needed
12. 12.True or false: browning lemon ink is a change that can be undone. (a) True (b) False
13. 13.🧂 Which of these dissolves in water? (a) chalk powder (b) cooking oil (c) small pebbles (d) table salt
14. 14.True or false: sand dissolves in water. (a) True (b) False
15. 15.True or false: a piece of string is not needed for growing salt crystals. (a) False (b) True
16. 16.🧺 Which of these is not needed for growing salt crystals? (a) a shallow dish (b) a magnet (c) a piece of string (d) warm water
17. 17.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: the amount of water is kept the same. (a) False (b) True
18. 18.🧂 What shape are table salt crystals under a magnifying glass? (a) tiny triangles (b) tiny spheres (c) tiny cubes (d) tiny stars
19. 19.🧈 Which of these is a change that can be undone? (a) cooking an egg (b) milk turning to curd (c) freezing water (d) browning lemon ink
20. 20.🛟 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
21. 21.🧺 Which of these is needed for growing salt crystals? (a) salt (b) a magnet (c) a mirror (d) a battery cell
22. 22.⚖️ 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) False (b) True
23. 23.🧂 Does baking soda dissolve in water? (a) dissolves in water (b) does not dissolve
24. 24.True or false: melting ice is a change that cannot be undone. (a) False (b) True
25. 25.🧈 Which of these is a change that cannot be undone? (a) melting ice (b) dissolving salt (c) melting butter (d) rusting iron
26. 26.True or false: baking soda does not dissolve in water. (a) False (b) True
27. 27.🧈 Can this change be undone: melting butter? (a) cannot be undone (b) can be undone
28. 28.🔍 Which is the odd one out? (a) sand (b) chalk powder (c) sugar (d) sawdust
29. 29.🔍 Which is the odd one out? (a) cooking oil (b) glucose powder (c) table salt (d) sugar
30. 30.🔍 Which is the odd one out? (a) small pebbles (b) food colour (c) glucose powder (d) baking soda
31. 31.🧺 Do we need a piece of string for growing salt crystals? (a) needed (b) not needed
32. 32.🧂 Does table salt dissolve in water? (a) does not dissolve (b) dissolves in water
33. 33.⚖️ 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) True (b) False
34. 34.⚖️ 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 salt (b) days to see crystals (c) the same dish (d) sunny or shady place
35. 35.⚖️ 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 change it (b) we keep it the same (c) we measure it
36. 36.True or false: a balloon is not needed for growing salt crystals. (a) False (b) True
37. 37.True or false: rusting iron is a change that can be undone. (a) False (b) True
38. 38.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) warm water (b) a piece of string (c) yeast (d) a spoon
39. 39.🧂 Why do crystals appear as the dish dries? (a) salt grows roots (b) the dish melts (c) salt eats water (d) water evaporates
40. 40.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: the amount of salt is kept the same. (a) True (b) False

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