Salt Crystal Experiment Worksheet

Science experiments lesson 18: Growing salt crystals · Set 139 · 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 cool the water (b) to make it fizz (c) to make it very salty (d) to change its colour
2. 2.⚖️ 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 same dish (c) the amount of water (d) sunny or shady place
3. 3.🧈 Can this change be undone: rusting iron? (a) cannot be undone (b) can be undone
4. 4.⚖️ 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
5. 5.True or false: yeast is not needed for growing salt crystals. (a) False (b) True
6. 6.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: sunny or shady place is kept the same. (a) False (b) True
7. 7.🧂 Why do crystals appear as the dish dries? (a) the dish melts (b) water evaporates (c) salt eats water (d) salt grows roots
8. 8.🔮 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
9. 9.🔍 Which is the odd one out? (a) sugar (b) glucose powder (c) table salt (d) chalk powder
10. 10.🧂 Which of these does not dissolve in water? (a) glucose powder (b) sugar (c) sand (d) table salt
11. 11.⚖️ 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 measure it (b) we change it (c) we keep it the same
12. 12.🧂 Which of these does not dissolve in water? (a) baking soda (b) glucose powder (c) cooking oil (d) sugar
13. 13.🧈 Which of these is a change that can be undone? (a) folding paper (b) milk turning to curd (c) rusting iron (d) browning lemon ink
14. 14.🛟 Who should pour the warm water for the crystal experiment? (a) the youngest child (b) nobody needs to (c) a grown-up (d) a friend who is running
15. 15.🧈 Can this change be undone: dissolving salt? (a) cannot be undone (b) can be undone
16. 16.🧂 Which of these does not dissolve in water? (a) chalk powder (b) food colour (c) glucose powder (d) sugar
17. 17.⚖️ 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 same dish (b) sunny or shady place (c) days to see crystals (d) the amount of water
18. 18.🧂 Does baking soda 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) no crystals (b) liquid crystals (c) bigger crystals (d) smaller crystals
20. 20.🧈 Can this change be undone: cooking an egg? (a) can be undone (b) cannot be undone
21. 21.🧂 Does sugar dissolve in water? (a) does not dissolve (b) dissolves in water
22. 22.🧂 Does sawdust dissolve in water? (a) does not dissolve (b) dissolves in water
23. 23.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) salt (b) a shallow dish (c) turmeric powder (d) a spoon
24. 24.🛟 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
25. 25.🔍 Which is the odd one out? (a) cooking oil (b) food colour (c) sugar (d) baking soda
26. 26.🧂 Which of these dissolves in water? (a) sawdust (b) chalk powder (c) sand (d) baking soda
27. 27.True or false: baking soda dissolves in water. (a) False (b) True
28. 28.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: days to see crystals is what we measure. (a) False (b) True
29. 29.True or false: cooking oil dissolves in water. (a) False (b) True
30. 30.True or false: melting ice is a change that cannot be undone. (a) False (b) True
31. 31.True or false: sugar dissolves in water. (a) True (b) False
32. 32.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: the same dish is the one thing we change. (a) False (b) True
33. 33.⚖️ 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 measure it (c) we change it
34. 34.🧺 Do we need a spoon for growing salt crystals? (a) not needed (b) needed
35. 35.🧺 Do we need a mirror for growing salt crystals? (a) needed (b) not needed
36. 36.🧺 Which of these is not needed for growing salt crystals? (a) a mirror (b) a piece of string (c) warm water (d) a spoon
37. 37.⚖️ 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) True (b) False
38. 38.🧈 Can this change be undone: melting ice? (a) can be undone (b) cannot be undone
39. 39.⚖️ 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 change it (c) we keep it the same
40. 40.🔍 Which is the odd one out? (a) small pebbles (b) glucose powder (c) sand (d) chalk powder

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