Salt Crystal Experiment Worksheet

Science experiments lesson 18: Growing salt crystals · Set 99 · 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.True or false: baking a cake is a change that cannot be undone. (a) False (b) True
2. 2.🧂 Which of these does not dissolve in water? (a) glucose powder (b) food colour (c) table salt (d) sawdust
3. 3.🧂 What shape are table salt crystals under a magnifying glass? (a) tiny cubes (b) tiny spheres (c) tiny stars (d) tiny triangles
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) the amount of water (b) the same dish (c) sunny or shady place (d) days to see crystals
5. 5.🔍 Which is the odd one out? (a) sugar (b) cooking oil (c) sawdust (d) small pebbles
6. 6.🧈 Can this change be undone: rusting iron? (a) can be undone (b) cannot be undone
7. 7.🧈 Can this change be undone: melting ice? (a) cannot be undone (b) can be undone
8. 8.🧈 Which of these is a change that cannot be undone? (a) folding paper (b) melting ice (c) melting butter (d) baking a cake
9. 9.🧂 Which of these dissolves in water? (a) cooking oil (b) sawdust (c) small pebbles (d) food colour
10. 10.🧺 Which of these is needed for growing salt crystals? (a) salt (b) a balloon (c) a battery cell (d) turmeric powder
11. 11.🧺 Which of these is needed for growing salt crystals? (a) a magnet (b) a battery cell (c) turmeric powder (d) warm water
12. 12.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: the kind of salt is kept the same. (a) False (b) True
13. 13.🧂 Why do crystals appear as the dish dries? (a) the dish melts (b) salt eats water (c) water evaporates (d) salt grows roots
14. 14.⚖️ 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
15. 15.🧺 Do we need warm water for growing salt crystals? (a) needed (b) not needed
16. 16.⚖️ Fair test — do salt crystals form faster on a sunny windowsill or in a shady cupboard? True or false: sunny or shady place is the one thing we change. (a) False (b) True
17. 17.🌊 How is salt made in salt pans by the sea? (a) salt rains down (b) sea water evaporates (c) fish make it (d) sand is ground up
18. 18.True or false: a piece of string is not needed for growing salt crystals. (a) True (b) False
19. 19.🧂 Does sand dissolve in water? (a) does not dissolve (b) dissolves in water
20. 20.🛟 Who should pour the warm water for the crystal experiment? (a) a friend who is running (b) a grown-up (c) nobody needs to (d) the youngest child
21. 21.🔮 Predict: you use sugar instead of salt. What happens as it dries? (a) it turns to butter (b) it turns to oil (c) salt crystals form (d) sugar crystals form
22. 22.True or false: melting butter is a change that can be undone. (a) False (b) True
23. 23.🧺 Do we need a shallow dish for growing salt crystals? (a) not needed (b) needed
24. 24.🧺 Do we need turmeric powder for growing salt crystals? (a) not needed (b) needed
25. 25.🧈 Can this change be undone: milk turning to curd? (a) can be undone (b) cannot be undone
26. 26.🧈 Can this change be undone: freezing water? (a) cannot be undone (b) can be undone
27. 27.True or false: sugar does not dissolve in water. (a) True (b) False
28. 28.🧺 Which of these is needed for growing salt crystals? (a) a battery cell (b) a magnet (c) yeast (d) a shallow dish
29. 29.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a piece of string (b) warm water (c) salt (d) a balloon
30. 30.🧂 Does glucose powder dissolve in water? (a) dissolves in water (b) does not dissolve
31. 31.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a magnet (b) warm water (c) a piece of string (d) a spoon
32. 32.🛟 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
33. 33.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a spoon (b) turmeric powder (c) warm water (d) salt
34. 34.🧂 Which of these does not dissolve in water? (a) table salt (b) chalk powder (c) glucose powder (d) baking soda
35. 35.🔮 Predict: crystals grow slowly where nobody disturbs them. How big are they? (a) no crystals (b) liquid crystals (c) bigger crystals (d) smaller crystals
36. 36.🧂 Why do we stir in salt until no more will dissolve? (a) to make it fizz (b) to change its colour (c) to make it very salty (d) to cool the water
37. 37.🧺 Three of these are needed for growing salt crystals. Which one is NOT needed? (a) a piece of string (b) yeast (c) warm water (d) salt
38. 38.True or false: rusting iron is a change that cannot be undone. (a) False (b) True
39. 39.True or false: a shallow dish is needed for growing salt crystals. (a) True (b) False
40. 40.🧺 Which of these is not needed for growing salt crystals? (a) warm water (b) a mirror (c) salt (d) a spoon

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