Salt Crystal Experiment Worksheet

Science experiments lesson 18: Growing salt crystals · Set 720 · 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 very salty (b) to change its colour (c) to cool the water (d) to make it fizz
2. 2.🛟 Who should pour the warm water for the crystal experiment? (a) a friend who is running (b) a grown-up (c) the youngest child (d) nobody needs to
3. 3.🧈 Which of these is a change that can be undone? (a) browning lemon ink (b) milk turning to curd (c) melting butter (d) baking a cake
4. 4.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? Which of these is what we measure? (a) sunny or shady place (b) days to see crystals (c) the amount of salt (d) the amount of water
5. 5.🧂 What shape are table salt crystals under a magnifying glass? (a) tiny spheres (b) tiny cubes (c) tiny triangles (d) tiny stars
6. 6.True or false: salt is not needed for growing salt crystals. (a) True (b) False
7. 7.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a mirror (b) salt (c) a piece of string (d) warm water
8. 8.🧈 Can this change be undone: folding paper? (a) cannot be undone (b) can be undone
9. 9.🛟 Where should you keep the crystal dish while it dries? (a) in a busy doorway (b) on the edge of a table (c) next to the baby (d) safe from small children
10. 10.True or false: melting butter is a change that cannot be undone. (a) False (b) True
11. 11.True or false: sand dissolves in water. (a) False (b) True
12. 12.🧂 Which of these dissolves in water? (a) cooking oil (b) small pebbles (c) table salt (d) sawdust
13. 13.🧂 Does glucose powder dissolve in water? (a) does not dissolve (b) dissolves in water
14. 14.🧂 Which of these dissolves in water? (a) sugar (b) small pebbles (c) chalk powder (d) sand
15. 15.🧂 Which of these does not dissolve in water? (a) table salt (b) sugar (c) glucose powder (d) small pebbles
16. 16.🧈 Can this change be undone: dissolving salt? (a) can be undone (b) cannot be undone
17. 17.🧂 Which of these does not dissolve in water? (a) sugar (b) table salt (c) food colour (d) sawdust
18. 18.🧂 Does cooking oil dissolve in water? (a) dissolves in water (b) does not dissolve
19. 19.True or false: salt is needed for growing salt crystals. (a) False (b) True
20. 20.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a battery cell (b) a spoon (c) a shallow dish (d) warm water
21. 21.⚖️ 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) True (b) False
22. 22.🧺 Do we need yeast for growing salt crystals? (a) not needed (b) needed
23. 23.⚖️ 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 measure it (b) we change it (c) we keep it the same
24. 24.🧈 Which of these is a change that can be undone? (a) milk turning to curd (b) baking a cake (c) freezing water (d) cooking an egg
25. 25.🧂 Which of these does not dissolve in water? (a) sand (b) table salt (c) baking soda (d) food colour
26. 26.🧺 Which of these is needed for growing salt crystals? (a) turmeric powder (b) a battery cell (c) a magnet (d) warm water
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) False (b) True
28. 28.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) turmeric powder (b) a piece of string (c) warm water (d) a shallow dish
29. 29.🔮 Predict: crystals grow slowly where nobody disturbs them. How big are they? (a) liquid crystals (b) smaller crystals (c) no crystals (d) bigger crystals
30. 30.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? Which of these is kept the same? (a) sunny or shady place (b) the kind of salt (c) days to see crystals
31. 31.🔮 Predict: you cover the dish so no water can escape. What happens? (a) crystals grow faster (b) few or no crystals (c) it fizzes (d) it turns sweet
32. 32.🔮 Predict: you use sugar instead of salt. What happens as it dries? (a) it turns to oil (b) sugar crystals form (c) salt crystals form (d) it turns to butter
33. 33.True or false: small pebbles dissolves in water. (a) True (b) False
34. 34.🧂 Which of these does not dissolve in water? (a) food colour (b) sugar (c) glucose powder (d) cooking oil
35. 35.🧈 Which of these is a change that cannot be undone? (a) melting ice (b) melting butter (c) baking a cake (d) dissolving salt
36. 36.🧈 Which of these is a change that can be undone? (a) rusting iron (b) folding paper (c) baking a cake (d) milk turning to curd
37. 37.True or false: a balloon is needed for growing salt crystals. (a) False (b) True
38. 38.⚖️ 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 amount of water (b) sunny or shady place (c) the same dish (d) days to see crystals
39. 39.True or false: turmeric powder is needed for growing salt crystals. (a) False (b) True
40. 40.🧺 Do we need a battery cell for growing salt crystals? (a) not needed (b) needed

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