Salt Crystal Experiment Worksheet

Science experiments lesson 18: Growing salt crystals · Set 158 · 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 not needed for growing salt crystals? (a) warm water (b) a piece of string (c) a spoon (d) yeast
2. 2.⚖️ 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 measure it (c) we keep it the same
3. 3.True or false: melting butter is a change that cannot be undone. (a) False (b) True
4. 4.⚖️ 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) sunny or shady place (b) the amount of water (c) the kind of salt (d) the amount of salt
5. 5.🧂 Does sawdust dissolve in water? (a) dissolves in water (b) does not dissolve
6. 6.🛟 Who should pour the warm water for the crystal experiment? (a) nobody needs to (b) a grown-up (c) a friend who is running (d) the youngest child
7. 7.🔮 Predict: crystals grow slowly where nobody disturbs them. How big are they? (a) smaller crystals (b) liquid crystals (c) no crystals (d) bigger crystals
8. 8.🔮 Predict: you use sugar instead of salt. What happens as it dries? (a) it turns to butter (b) sugar crystals form (c) it turns to oil (d) salt crystals form
9. 9.🔍 Which is the odd one out? (a) sugar (b) sand (c) sawdust (d) small pebbles
10. 10.True or false: a piece of string is needed for growing salt crystals. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) chalk powder (b) glucose powder (c) sand (d) cooking oil
12. 12.🧂 Why do we stir in salt until no more will dissolve? (a) to change its colour (b) to make it very salty (c) to cool the water (d) to make it fizz
13. 13.🛟 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
14. 14.🧈 Which of these is a change that cannot be undone? (a) dissolving salt (b) folding paper (c) rusting iron (d) melting ice
15. 15.🧈 Can this change be undone: melting ice? (a) can be undone (b) cannot be undone
16. 16.🧂 Which of these dissolves in water? (a) sand (b) chalk powder (c) food colour (d) cooking oil
17. 17.🧂 Which of these does not dissolve in water? (a) sugar (b) baking soda (c) cooking oil (d) table salt
18. 18.🧺 Do we need turmeric powder for growing salt crystals? (a) not needed (b) needed
19. 19.True or false: glucose powder does not dissolve in water. (a) True (b) False
20. 20.🧺 Do we need yeast for growing salt crystals? (a) not needed (b) needed
21. 21.🧂 Does glucose powder dissolve in water? (a) does not dissolve (b) dissolves in water
22. 22.True or false: sugar dissolves in water. (a) True (b) False
23. 23.🧺 Do we need a piece of string for growing salt crystals? (a) needed (b) not needed
24. 24.True or false: sawdust dissolves in water. (a) True (b) False
25. 25.⚖️ 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 same dish (b) days to see crystals (c) sunny or shady place
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 change it (c) we keep it the same
27. 27.🧈 Which of these is a change that can be undone? (a) freezing water (b) cooking an egg (c) baking a cake (d) rusting iron
28. 28.True or false: folding paper is a change that can be undone. (a) False (b) True
29. 29.True or false: rusting iron is a change that cannot be undone. (a) True (b) False
30. 30.⚖️ 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 salt (b) the kind of salt (c) sunny or shady place (d) days to see 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 amount of salt”? (a) we keep it the same (b) we measure it (c) we change it
32. 32.⚖️ 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 measure it (c) we keep it the same
33. 33.🧂 Which of these dissolves in water? (a) sawdust (b) table salt (c) small pebbles (d) cooking oil
34. 34.🧂 What shape are table salt crystals under a magnifying glass? (a) tiny spheres (b) tiny triangles (c) tiny cubes (d) tiny stars
35. 35.🧂 Which of these does not dissolve in water? (a) food colour (b) chalk powder (c) baking soda (d) table salt
36. 36.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) warm water (b) salt (c) yeast (d) a shallow dish
37. 37.🧂 Why do crystals appear as the dish dries? (a) water evaporates (b) salt grows roots (c) salt eats water (d) the dish melts
38. 38.🧂 Does small pebbles dissolve in water? (a) dissolves in water (b) does not dissolve
39. 39.True or false: browning lemon ink is a change that can be undone. (a) True (b) False
40. 40.🧈 Can this change be undone: cooking an egg? (a) can be undone (b) cannot be undone

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