Salt Crystal Experiment Worksheet

Science experiments lesson 18: Growing salt crystals · Set 579 · 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 change its colour (b) to make it fizz (c) to make it very salty (d) to cool the water
2. 2.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a piece of string (b) a balloon (c) a spoon (d) warm water
3. 3.🔍 Which is the odd one out? (a) table salt (b) small pebbles (c) baking soda (d) sugar
4. 4.True or false: salt is not needed for growing salt crystals. (a) True (b) False
5. 5.🧂 Which of these dissolves in water? (a) small pebbles (b) chalk powder (c) sugar (d) sawdust
6. 6.🧈 Which of these is a change that can be undone? (a) milk turning to curd (b) baking a cake (c) freezing water (d) cooking an egg
7. 7.🧺 Do we need a spoon for growing salt crystals? (a) needed (b) not needed
8. 8.True or false: sawdust dissolves in water. (a) True (b) False
9. 9.🧈 Can this change be undone: rusting iron? (a) cannot be undone (b) can be undone
10. 10.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a spoon (b) a battery cell (c) a piece of string (d) warm water
11. 11.⚖️ 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 change it (b) we keep it the same (c) we measure it
12. 12.🧈 Which of these is a change that cannot be undone? (a) folding paper (b) dissolving salt (c) rusting iron (d) freezing water
13. 13.🧈 Can this change be undone: melting butter? (a) cannot be undone (b) can be undone
14. 14.🔍 Which is the odd one out? (a) cooking oil (b) sugar (c) sand (d) small pebbles
15. 15.True or false: chalk powder does not dissolve in water. (a) False (b) True
16. 16.🧺 Do we need turmeric powder for growing salt crystals? (a) not needed (b) needed
17. 17.⚖️ 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 keep it the same (b) we measure it (c) we change it
18. 18.🛟 Who should pour the warm water for the crystal experiment? (a) a friend who is running (b) a grown-up (c) nobody needs to (d) the youngest child
19. 19.🧺 Do we need a battery cell for growing salt crystals? (a) needed (b) not needed
20. 20.True or false: food colour dissolves in water. (a) False (b) True
21. 21.True or false: warm water is needed for growing salt crystals. (a) False (b) True
22. 22.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) warm water (b) a magnet (c) a shallow dish (d) a piece of string
23. 23.⚖️ 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 amount of water (c) days to see crystals
24. 24.🔮 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
25. 25.🧂 Why do crystals appear as the dish dries? (a) the dish melts (b) salt grows roots (c) water evaporates (d) salt eats water
26. 26.True or false: sawdust does not dissolve in water. (a) False (b) True
27. 27.🧺 Do we need a balloon for growing salt crystals? (a) needed (b) not needed
28. 28.⚖️ 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 keep it the same (c) we measure it
29. 29.🌊 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
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 water”? (a) we measure it (b) we change it (c) we keep it the same
31. 31.⚖️ 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 change it (b) we keep it the same (c) we measure it
32. 32.True or false: a shallow dish is needed for growing salt crystals. (a) False (b) True
33. 33.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a piece of string (b) a shallow dish (c) a spoon (d) yeast
34. 34.🧂 Does baking soda dissolve in water? (a) dissolves in water (b) does not dissolve
35. 35.True or false: melting ice is a change that cannot be undone. (a) False (b) True
36. 36.🧈 Which of these is a change that can be undone? (a) cooking an egg (b) browning lemon ink (c) baking a cake (d) dissolving salt
37. 37.True or false: small pebbles dissolves in water. (a) False (b) True
38. 38.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: the kind of salt is the one thing we change. (a) False (b) True
39. 39.🔮 Predict: you use sugar instead of salt. What happens as it dries? (a) salt crystals form (b) it turns to oil (c) sugar crystals form (d) it turns to butter
40. 40.🛟 Where should you keep the crystal dish while it dries? (a) safe from small children (b) on the edge of a table (c) next to the baby (d) in a busy doorway

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