Salt Crystal Experiment Worksheet

Science experiments lesson 18: Growing salt crystals · Set 80 · 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.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a spoon (b) salt (c) warm water (d) a magnet
2. 2.⚖️ 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 measure it (b) we change it (c) we keep it the same
3. 3.🧂 What shape are table salt crystals under a magnifying glass? (a) tiny spheres (b) tiny cubes (c) tiny stars (d) tiny triangles
4. 4.🌊 How is salt made in salt pans by the sea? (a) salt rains down (b) sea water evaporates (c) fish make it (d) sand is ground up
5. 5.True or false: a battery cell is needed for growing salt crystals. (a) True (b) False
6. 6.🧈 Which of these is a change that cannot be undone? (a) milk turning to curd (b) dissolving salt (c) freezing water (d) melting ice
7. 7.True or false: baking soda does not dissolve in water. (a) False (b) True
8. 8.🧈 Can this change be undone: milk turning to curd? (a) cannot be undone (b) can be undone
9. 9.🧈 Can this change be undone: rusting iron? (a) cannot be undone (b) can be undone
10. 10.True or false: sand does not dissolve in water. (a) False (b) True
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 measure it (b) we keep it the same (c) we change it
12. 12.True or false: food colour dissolves in water. (a) True (b) False
13. 13.🧈 Which of these is a change that can be undone? (a) rusting iron (b) folding paper (c) milk turning to curd (d) baking a cake
14. 14.True or false: rusting iron is a change that cannot be undone. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) sand (b) chalk powder (c) small pebbles (d) food colour
16. 16.⚖️ 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
17. 17.🔮 Predict: crystals grow slowly where nobody disturbs them. How big are they? (a) bigger crystals (b) liquid crystals (c) smaller crystals (d) no crystals
18. 18.🧈 Which of these is a change that cannot be undone? (a) rusting iron (b) folding paper (c) freezing water (d) dissolving salt
19. 19.🧂 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
20. 20.True or false: melting butter is a change that can be undone. (a) False (b) True
21. 21.🧂 Why do crystals appear as the dish dries? (a) salt eats water (b) the dish melts (c) salt grows roots (d) water evaporates
22. 22.True or false: glucose powder does not dissolve in water. (a) False (b) True
23. 23.🧈 Can this change be undone: baking a cake? (a) can be undone (b) cannot be undone
24. 24.⚖️ 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
25. 25.⚖️ 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
26. 26.🧺 Which of these is needed for growing salt crystals? (a) a mirror (b) a battery cell (c) a magnet (d) warm water
27. 27.🧂 Which of these does not dissolve in water? (a) glucose powder (b) sugar (c) chalk powder (d) food colour
28. 28.⚖️ 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) sunny or shady place (b) the amount of salt (c) the same dish (d) the kind of salt
29. 29.⚖️ 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) False (b) True
30. 30.🧂 Which of these dissolves in water? (a) baking soda (b) cooking oil (c) chalk powder (d) sand
31. 31.🧺 Which of these is needed for growing salt crystals? (a) a battery cell (b) salt (c) a balloon (d) a mirror
32. 32.True or false: yeast is needed for growing salt crystals. (a) True (b) False
33. 33.🧈 Can this change be undone: browning lemon ink? (a) can be undone (b) cannot be undone
34. 34.True or false: rusting iron is a change that can be undone. (a) True (b) False
35. 35.🧂 Does food colour dissolve in water? (a) does not dissolve (b) dissolves in water
36. 36.⚖️ 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 keep it the same (c) we change it
37. 37.🧈 Can this change be undone: freezing water? (a) can be undone (b) cannot be undone
38. 38.⚖️ 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 measure it (b) we change it (c) we keep it the same
39. 39.🧈 Which of these is a change that can be undone? (a) melting ice (b) baking a cake (c) browning lemon ink (d) rusting iron
40. 40.🔍 Which is the odd one out? (a) sugar (b) chalk powder (c) baking soda (d) glucose powder

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