Salt Crystal Experiment Worksheet

Science experiments lesson 18: Growing salt crystals · Set 478 · 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 fizz (b) to make it very salty (c) to change its colour (d) to cool the water
2. 2.🧈 Can this change be undone: folding paper? (a) cannot be undone (b) can be undone
3. 3.🧈 Can this change be undone: rusting iron? (a) cannot be undone (b) can be undone
4. 4.🔍 Which is the odd one out? (a) table salt (b) cooking oil (c) small pebbles (d) sand
5. 5.🔮 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
6. 6.🔍 Which is the odd one out? (a) sawdust (b) table salt (c) baking soda (d) glucose powder
7. 7.True or false: baking soda dissolves in water. (a) True (b) False
8. 8.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? Which of these is what we measure? (a) the amount of water (b) the kind of salt (c) the same dish (d) days to see crystals
9. 9.True or false: cooking oil does not dissolve in water. (a) False (b) True
10. 10.🧺 Do we need a spoon for growing salt crystals? (a) not needed (b) needed
11. 11.🧺 Which of these is not needed for growing salt crystals? (a) a mirror (b) a shallow dish (c) a spoon (d) warm water
12. 12.🛟 Who should pour the warm water for the crystal experiment? (a) the youngest child (b) a grown-up (c) nobody needs to (d) a friend who is running
13. 13.⚖️ 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
14. 14.🧂 Does small pebbles dissolve in water? (a) does not dissolve (b) dissolves in water
15. 15.True or false: a piece of string is not needed for growing salt crystals. (a) True (b) False
16. 16.⚖️ 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 measure it (c) we keep it the same
17. 17.🧺 Do we need turmeric powder for growing salt crystals? (a) not needed (b) needed
18. 18.🧂 Does cooking oil dissolve in water? (a) dissolves in water (b) does not dissolve
19. 19.🔮 Predict: crystals grow slowly where nobody disturbs them. How big are they? (a) smaller crystals (b) no crystals (c) bigger crystals (d) liquid crystals
20. 20.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a balloon (b) a shallow dish (c) a piece of string (d) a spoon
21. 21.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: the kind of salt is kept the same. (a) False (b) True
22. 22.🧺 Which of these is not needed for growing salt crystals? (a) a battery cell (b) warm water (c) salt (d) a piece of string
23. 23.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: sunny or shady place is what we measure. (a) False (b) True
24. 24.🧂 Which of these does not dissolve in water? (a) glucose powder (b) sawdust (c) sugar (d) food colour
25. 25.True or false: a battery cell is not needed for growing salt crystals. (a) False (b) True
26. 26.True or false: sugar dissolves in water. (a) True (b) False
27. 27.🧈 Can this change be undone: dissolving salt? (a) cannot be undone (b) can be undone
28. 28.True or false: food colour dissolves in water. (a) False (b) True
29. 29.🧂 Why do crystals appear as the dish dries? (a) salt eats water (b) water evaporates (c) the dish melts (d) salt grows roots
30. 30.🔮 Predict: you cover the dish so no water can escape. What happens? (a) it fizzes (b) crystals grow faster (c) it turns sweet (d) few or no crystals
31. 31.⚖️ 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
32. 32.True or false: a mirror is not needed for growing salt crystals. (a) True (b) False
33. 33.🧺 Do we need a magnet for growing salt crystals? (a) not needed (b) needed
34. 34.🧂 Which of these does not dissolve in water? (a) sugar (b) food colour (c) chalk powder (d) baking soda
35. 35.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: the same dish is what we measure. (a) False (b) True
36. 36.🧺 Do we need a balloon for growing salt crystals? (a) not needed (b) needed
37. 37.🧂 Does chalk powder dissolve in water? (a) does not dissolve (b) dissolves in water
38. 38.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: the amount of water is what we measure. (a) False (b) True
39. 39.🧺 Do we need a shallow dish for growing salt crystals? (a) not needed (b) needed
40. 40.⚖️ 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 keep it the same (c) we change it

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