Salt Crystal Experiment Worksheet

Science experiments lesson 18: Growing salt crystals · Set 936 · 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.⚖️ 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
2. 2.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: sunny or shady place is the one thing we change. (a) False (b) True
3. 3.🧂 Why do crystals appear as the dish dries? (a) water evaporates (b) the dish melts (c) salt grows roots (d) salt eats water
4. 4.True or false: folding paper is a change that can be undone. (a) False (b) True
5. 5.🛟 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
6. 6.🧈 Which of these is a change that cannot be undone? (a) folding paper (b) melting butter (c) rusting iron (d) dissolving salt
7. 7.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a battery cell (b) a shallow dish (c) salt (d) warm water
8. 8.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a shallow dish (b) a mirror (c) a piece of string (d) warm water
9. 9.🔮 Predict: you cover the dish so no water can escape. What happens? (a) it fizzes (b) crystals grow faster (c) few or no crystals (d) it turns sweet
10. 10.🧈 Can this change be undone: rusting iron? (a) cannot be undone (b) can be undone
11. 11.⚖️ 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
12. 12.⚖️ 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) days to see crystals (b) the amount of water (c) sunny or shady place (d) the same dish
13. 13.🧈 Which of these is a change that cannot be undone? (a) cooking an egg (b) melting ice (c) freezing water (d) dissolving salt
14. 14.🧺 Which of these is not needed for growing salt crystals? (a) a spoon (b) a shallow dish (c) turmeric powder (d) a piece of string
15. 15.🧈 Can this change be undone: baking a cake? (a) can be undone (b) cannot be undone
16. 16.True or false: browning lemon ink is a change that can be undone. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) baking soda (b) sand (c) small pebbles (d) sawdust
18. 18.⚖️ 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) False (b) True
19. 19.🧈 Which of these is a change that can be undone? (a) milk turning to curd (b) rusting iron (c) baking a cake (d) freezing water
20. 20.⚖️ 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) sunny or shady place (d) the amount of water
21. 21.⚖️ 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
22. 22.⚖️ 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 keep it the same (b) we change it (c) we measure it
23. 23.True or false: cooking oil does not dissolve in water. (a) False (b) True
24. 24.True or false: a mirror is not needed for growing salt crystals. (a) False (b) True
25. 25.🧂 Which of these dissolves in water? (a) baking soda (b) chalk powder (c) cooking oil (d) small pebbles
26. 26.🧈 Which of these is a change that can be undone? (a) rusting iron (b) baking a cake (c) folding paper (d) browning lemon ink
27. 27.⚖️ 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) True (b) False
28. 28.🔮 Predict: you use sugar instead of salt. What happens as it dries? (a) sugar crystals form (b) it turns to oil (c) salt crystals form (d) it turns to butter
29. 29.🔮 Predict: crystals grow slowly where nobody disturbs them. How big are they? (a) bigger crystals (b) smaller crystals (c) liquid crystals (d) no crystals
30. 30.🧂 Does baking soda dissolve in water? (a) does not dissolve (b) dissolves in water
31. 31.True or false: turmeric powder is not needed for growing salt crystals. (a) True (b) False
32. 32.🧺 Which of these is not needed for growing salt crystals? (a) a shallow dish (b) yeast (c) a spoon (d) salt
33. 33.True or false: warm water is needed for growing salt crystals. (a) True (b) False
34. 34.🧺 Do we need a spoon for growing salt crystals? (a) needed (b) not needed
35. 35.🧂 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
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 water (b) sunny or shady place (c) days to see crystals
37. 37.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: the amount of salt is the one thing we change. (a) True (b) False
38. 38.🧺 Which of these is needed for growing salt crystals? (a) a battery cell (b) a balloon (c) warm water (d) yeast
39. 39.🧂 Does sand dissolve in water? (a) dissolves in water (b) does not dissolve
40. 40.True or false: rusting iron is a change that cannot be undone. (a) False (b) True

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