Salt Crystal Experiment Worksheet

Science experiments lesson 18: Growing salt crystals · Set 60 · 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 we stir in salt until no more will dissolve? (a) to make it very salty (b) to make it fizz (c) to change its colour (d) to cool the water
2. 2.🔮 Predict: you cover the dish so no water can escape. What happens? (a) crystals grow faster (b) it fizzes (c) it turns sweet (d) few or no crystals
3. 3.⚖️ 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
4. 4.🧺 Do we need a balloon for growing salt crystals? (a) needed (b) not needed
5. 5.🧺 Which of these is needed for growing salt crystals? (a) a magnet (b) turmeric powder (c) yeast (d) a spoon
6. 6.🌊 How is salt made in salt pans by the sea? (a) salt rains down (b) fish make it (c) sea water evaporates (d) sand is ground up
7. 7.⚖️ 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) the same dish (c) sunny or shady place (d) days to see crystals
8. 8.🧂 Does sugar dissolve in water? (a) does not dissolve (b) dissolves in water
9. 9.🧂 Which of these dissolves in water? (a) small pebbles (b) sugar (c) chalk powder (d) cooking oil
10. 10.🧺 Which of these is needed for growing salt crystals? (a) a magnet (b) a battery cell (c) salt (d) yeast
11. 11.🧂 Does table salt dissolve in water? (a) dissolves in water (b) does not dissolve
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 keep it the same (b) we measure it (c) we change it
13. 13.⚖️ 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
14. 14.🛟 Where should you keep the crystal dish while it dries? (a) next to the baby (b) on the edge of a table (c) safe from small children (d) in a busy doorway
15. 15.🔮 Predict: crystals grow slowly where nobody disturbs them. How big are they? (a) smaller crystals (b) bigger crystals (c) liquid crystals (d) no crystals
16. 16.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a shallow dish (b) salt (c) a piece of string (d) yeast
17. 17.True or false: a shallow dish is not needed for growing salt crystals. (a) False (b) True
18. 18.🔍 Which is the odd one out? (a) cooking oil (b) sawdust (c) food colour (d) sand
19. 19.🔍 Which is the odd one out? (a) food colour (b) glucose powder (c) sugar (d) small pebbles
20. 20.🔮 Predict: you use sugar instead of salt. What happens as it dries? (a) it turns to butter (b) salt crystals form (c) it turns to oil (d) sugar crystals form
21. 21.🧺 Which of these is not needed for growing salt crystals? (a) warm water (b) a balloon (c) a spoon (d) salt
22. 22.⚖️ 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 keep it the same (b) we measure it (c) we change it
23. 23.True or false: melting butter is a change that can be undone. (a) False (b) True
24. 24.🧂 Why do crystals appear as the dish dries? (a) salt eats water (b) salt grows roots (c) water evaporates (d) the dish melts
25. 25.True or false: a balloon is needed for growing salt crystals. (a) True (b) False
26. 26.🛟 Who should pour the warm water for the crystal experiment? (a) a grown-up (b) the youngest child (c) nobody needs to (d) a friend who is running
27. 27.🧈 Can this change be undone: freezing water? (a) cannot be undone (b) can be undone
28. 28.⚖️ 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
29. 29.🧺 Do we need a mirror for growing salt crystals? (a) needed (b) not needed
30. 30.🧺 Which of these is not needed for growing salt crystals? (a) a shallow dish (b) a spoon (c) a mirror (d) salt
31. 31.🧺 Which of these is needed for growing salt crystals? (a) a piece of string (b) yeast (c) turmeric powder (d) a magnet
32. 32.🧂 Which of these does not dissolve in water? (a) table salt (b) glucose powder (c) cooking oil (d) sugar
33. 33.🧺 Do we need salt for growing salt crystals? (a) needed (b) not needed
34. 34.🧺 Do we need a spoon for growing salt crystals? (a) needed (b) not needed
35. 35.True or false: rusting iron is a change that cannot be undone. (a) False (b) True
36. 36.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? Which of these is kept the same? (a) the amount of salt (b) sunny or shady place (c) days to see crystals
37. 37.🧂 Does baking soda dissolve in water? (a) does not dissolve (b) dissolves in water
38. 38.True or false: small pebbles dissolves in water. (a) True (b) False
39. 39.True or false: dissolving salt is a change that cannot be undone. (a) True (b) False
40. 40.True or false: salt is not needed for growing salt crystals. (a) True (b) False

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