Salt Crystal Experiment Worksheet

Science experiments lesson 18: Growing salt crystals · Set 274 · 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.🧂 Which of these does not dissolve in water? (a) sugar (b) baking soda (c) table salt (d) cooking oil
2. 2.⚖️ 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 keep it the same (c) we measure it
3. 3.🛟 Where should you keep the crystal dish while it dries? (a) in a busy doorway (b) next to the baby (c) on the edge of a table (d) safe from small children
4. 4.True or false: cooking oil dissolves in water. (a) False (b) True
5. 5.⚖️ 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
6. 6.🧂 Why do we stir in salt until no more will dissolve? (a) to make it fizz (b) to make it very salty (c) to change its colour (d) to cool the water
7. 7.True or false: baking soda does not dissolve in water. (a) True (b) False
8. 8.🧈 Which of these is a change that cannot be undone? (a) dissolving salt (b) cooking an egg (c) freezing water (d) folding paper
9. 9.⚖️ 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 keep it the same (c) we change it
10. 10.⚖️ 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) the amount of water (d) sunny or shady place
11. 11.True or false: freezing water is a change that cannot be undone. (a) False (b) True
12. 12.🧺 Which of these is needed for growing salt crystals? (a) a battery cell (b) a balloon (c) a piece of string (d) turmeric powder
13. 13.🧺 Which of these is not needed for growing salt crystals? (a) salt (b) warm water (c) yeast (d) a piece of string
14. 14.True or false: chalk powder dissolves in water. (a) True (b) False
15. 15.🧂 Which of these dissolves in water? (a) small pebbles (b) sand (c) sugar (d) sawdust
16. 16.🧺 Which of these is needed for growing salt crystals? (a) a balloon (b) turmeric powder (c) a magnet (d) warm water
17. 17.🧈 Which of these is a change that cannot be undone? (a) melting butter (b) baking a cake (c) folding paper (d) dissolving salt
18. 18.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? Which of these is what we measure? (a) days to see crystals (b) the kind of salt (c) the same dish (d) the amount of salt
19. 19.⚖️ 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 change it (c) we measure it
20. 20.🧈 Can this change be undone: cooking an egg? (a) cannot be undone (b) can be undone
21. 21.🧺 Which of these is not needed for growing salt crystals? (a) warm water (b) salt (c) a spoon (d) a battery cell
22. 22.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a shallow dish (b) a balloon (c) a spoon (d) a piece of string
23. 23.🧂 Which of these does not dissolve in water? (a) baking soda (b) table salt (c) sugar (d) chalk powder
24. 24.🌊 How is salt made in salt pans by the sea? (a) salt rains down (b) fish make it (c) sand is ground up (d) sea water evaporates
25. 25.🧂 Why do crystals appear as the dish dries? (a) the dish melts (b) salt grows roots (c) salt eats water (d) water evaporates
26. 26.⚖️ 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 change it (c) we measure it
27. 27.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) salt (b) a shallow dish (c) a piece of string (d) yeast
28. 28.🧈 Can this change be undone: dissolving salt? (a) cannot be undone (b) can be undone
29. 29.🧈 Which of these is a change that can be undone? (a) milk turning to curd (b) folding paper (c) browning lemon ink (d) baking a cake
30. 30.🧺 Do we need a battery cell for growing salt crystals? (a) needed (b) not needed
31. 31.📘 What do we call a solution that cannot dissolve any more salt? (a) frozen (b) saturated (c) empty (d) magnetic
32. 32.🛟 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
33. 33.True or false: a piece of string is not needed for growing salt crystals. (a) True (b) False
34. 34.True or false: melting ice is a change that cannot be undone. (a) True (b) False
35. 35.🔮 Predict: you cover the dish so no water can escape. What happens? (a) few or no crystals (b) it fizzes (c) it turns sweet (d) crystals grow faster
36. 36.True or false: rusting iron is a change that can be undone. (a) False (b) True
37. 37.🧈 Which of these is a change that can be undone? (a) rusting iron (b) baking a cake (c) dissolving salt (d) cooking an egg
38. 38.🔍 Which is the odd one out? (a) sugar (b) glucose powder (c) chalk powder (d) food colour
39. 39.🧂 Does baking soda dissolve in water? (a) dissolves in water (b) does not dissolve
40. 40.🧂 Does small pebbles dissolve in water? (a) does not dissolve (b) dissolves in water

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