Salt Crystal Experiment Worksheet

Science experiments lesson 18: Growing salt crystals · Set 727 · 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.🧈 Can this change be undone: milk turning to curd? (a) cannot be undone (b) can be undone
2. 2.⚖️ 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) the amount of salt (c) the kind of salt (d) sunny or shady place
3. 3.⚖️ 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
4. 4.⚖️ 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
5. 5.🧂 Why do we stir in salt until no more will dissolve? (a) to make it fizz (b) to cool the water (c) to make it very salty (d) to change its colour
6. 6.🧺 Do we need a shallow dish for growing salt crystals? (a) not needed (b) needed
7. 7.🧺 Do we need warm water for growing salt crystals? (a) needed (b) not needed
8. 8.🧂 Why do crystals appear as the dish dries? (a) the dish melts (b) salt eats water (c) salt grows roots (d) water evaporates
9. 9.⚖️ 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 kind of salt (b) days to see crystals (c) sunny or shady place
10. 10.🧂 Does cooking oil dissolve in water? (a) does not dissolve (b) dissolves in water
11. 11.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) yeast (b) a spoon (c) warm water (d) a shallow dish
12. 12.🧺 Which of these is needed for growing salt crystals? (a) yeast (b) warm water (c) a mirror (d) a battery cell
13. 13.🧺 Do we need a mirror for growing salt crystals? (a) not needed (b) needed
14. 14.🔍 Which is the odd one out? (a) glucose powder (b) sand (c) cooking oil (d) small pebbles
15. 15.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a magnet (b) warm water (c) a shallow dish (d) salt
16. 16.True or false: freezing water is a change that cannot be undone. (a) False (b) True
17. 17.🧂 Which of these does not dissolve in water? (a) food colour (b) chalk powder (c) sugar (d) table salt
18. 18.🧺 Do we need a spoon for growing salt crystals? (a) not needed (b) needed
19. 19.🔍 Which is the odd one out? (a) small pebbles (b) food colour (c) baking soda (d) table salt
20. 20.🧂 Which of these dissolves in water? (a) sawdust (b) chalk powder (c) baking soda (d) cooking oil
21. 21.🧈 Which of these is a change that cannot be undone? (a) dissolving salt (b) freezing water (c) milk turning to curd (d) folding paper
22. 22.🧈 Can this change be undone: melting ice? (a) can be undone (b) cannot be undone
23. 23.⚖️ 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
24. 24.🧈 Which of these is a change that cannot be undone? (a) baking a cake (b) melting butter (c) folding paper (d) freezing water
25. 25.🌊 How is salt made in salt pans by the sea? (a) fish make it (b) sand is ground up (c) salt rains down (d) sea 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 measure it (b) we keep it the same (c) we change it
27. 27.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: the kind of salt is what we measure. (a) True (b) False
28. 28.🧺 Do we need yeast for growing salt crystals? (a) needed (b) not needed
29. 29.🧈 Can this change be undone: freezing water? (a) cannot be undone (b) can be undone
30. 30.🔮 Predict: crystals grow slowly where nobody disturbs them. How big are they? (a) liquid crystals (b) no crystals (c) smaller crystals (d) bigger crystals
31. 31.🧂 Does small pebbles dissolve in water? (a) dissolves in water (b) does not dissolve
32. 32.True or false: a spoon is needed for growing salt crystals. (a) False (b) True
33. 33.True or false: a balloon is needed for growing salt crystals. (a) True (b) False
34. 34.🧈 Can this change be undone: browning lemon ink? (a) can be undone (b) cannot be undone
35. 35.🧂 Does chalk powder dissolve in water? (a) dissolves in water (b) does not dissolve
36. 36.True or false: a spoon is not needed for growing salt crystals. (a) True (b) False
37. 37.🛟 Where should you keep the crystal dish while it dries? (a) safe from small children (b) next to the baby (c) on the edge of a table (d) in a busy doorway
38. 38.🧺 Do we need a battery cell for growing salt crystals? (a) not needed (b) needed
39. 39.🧺 Do we need turmeric powder for growing salt crystals? (a) not needed (b) needed
40. 40.🧂 Which of these dissolves in water? (a) sand (b) small pebbles (c) sawdust (d) table salt

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