Salt Crystal Experiment Worksheet

Science experiments lesson 18: Growing salt crystals · Set 760 · 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 is a change that can be undone? (a) browning lemon ink (b) melting ice (c) milk turning to curd (d) cooking an egg
2. 2.🔮 Predict: you use sugar instead of salt. What happens as it dries? (a) it turns to butter (b) sugar crystals form (c) salt crystals form (d) it turns to oil
3. 3.🧺 Do we need a piece of string for growing salt crystals? (a) needed (b) not needed
4. 4.🧺 Do we need a mirror for growing salt crystals? (a) needed (b) not needed
5. 5.🛟 Who should pour the warm water for the crystal experiment? (a) a grown-up (b) the youngest child (c) a friend who is running (d) nobody needs to
6. 6.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a shallow dish (b) a balloon (c) a piece of string (d) salt
7. 7.⚖️ 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) sunny or shady place (c) the amount of water (d) the same dish
8. 8.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a shallow dish (b) a piece of string (c) warm water (d) a battery cell
9. 9.True or false: baking a cake is a change that can be undone. (a) False (b) True
10. 10.⚖️ 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 measure it (c) we change it
11. 11.🧂 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
12. 12.🛟 Where should you keep the crystal dish while it dries? (a) on the edge of a table (b) next to the baby (c) safe from small children (d) in a busy doorway
13. 13.True or false: food colour does not dissolve in water. (a) False (b) True
14. 14.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a spoon (b) a piece of string (c) salt (d) turmeric powder
15. 15.True or false: small pebbles dissolves in water. (a) True (b) False
16. 16.🧈 Can this change be undone: melting butter? (a) can be undone (b) cannot be undone
17. 17.True or false: a shallow dish is not needed for growing salt crystals. (a) True (b) False
18. 18.🌊 How is salt made in salt pans by the sea? (a) salt rains down (b) sand is ground up (c) fish make it (d) sea water evaporates
19. 19.🧺 Which of these is needed for growing salt crystals? (a) salt (b) a battery cell (c) a balloon (d) a magnet
20. 20.🧂 Does glucose powder dissolve in water? (a) dissolves in water (b) does not dissolve
21. 21.🧺 Do we need warm water for growing salt crystals? (a) not needed (b) needed
22. 22.🧂 Which of these dissolves in water? (a) small pebbles (b) glucose powder (c) cooking oil (d) chalk powder
23. 23.🧺 Do we need a shallow dish for growing salt crystals? (a) needed (b) not needed
24. 24.🧂 Which of these does not dissolve in water? (a) food colour (b) sawdust (c) table salt (d) sugar
25. 25.True or false: freezing water is a change that can be undone. (a) True (b) False
26. 26.🧺 Do we need a balloon for growing salt crystals? (a) needed (b) not needed
27. 27.🧂 Which of these dissolves in water? (a) chalk powder (b) sawdust (c) baking soda (d) sand
28. 28.🧂 What shape are table salt crystals under a magnifying glass? (a) tiny stars (b) tiny spheres (c) tiny cubes (d) tiny triangles
29. 29.🧈 Can this change be undone: baking a cake? (a) can be undone (b) cannot be undone
30. 30.🧺 Which of these is needed for growing salt crystals? (a) a mirror (b) turmeric powder (c) a spoon (d) a battery cell
31. 31.True or false: browning lemon ink is a change that can be undone. (a) False (b) True
32. 32.🧈 Which of these is a change that cannot be undone? (a) melting ice (b) milk turning to curd (c) freezing water (d) folding paper
33. 33.🧂 Why do crystals appear as the dish dries? (a) salt eats water (b) water evaporates (c) salt grows roots (d) the dish melts
34. 34.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a magnet (b) salt (c) a shallow dish (d) warm water
35. 35.True or false: table salt does not dissolve in water. (a) True (b) False
36. 36.⚖️ 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 kind of salt (b) the amount of salt (c) sunny or shady place (d) days to see crystals
37. 37.🔮 Predict: you cover the dish so no water can escape. What happens? (a) it fizzes (b) it turns sweet (c) few or no crystals (d) crystals grow faster
38. 38.🔍 Which is the odd one out? (a) chalk powder (b) sawdust (c) small pebbles (d) food colour
39. 39.⚖️ 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
40. 40.⚖️ 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

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