1. Let’s Discover Salt Crystals

2. Sodium Chloride, NaCl

3. Copper(II) sulphate, CuSO4

4. Some examples of Crystals

5. Potassium Chromate(VI), K2CrO4

6. Potassium dichromate(K2Cr2O7)

7. Physical Properties of Crystals
 Have fixed geometrical shapes such as a
cuboid, rhombic or prism
 Have flat surfaces, straight edges & sharp
angles.
 Have fixed angles between two neighbouring
surfaces
 Crystals of the same substance have same
shapes but may be in different sizes

8. All crystals have fixed geometrical shapes

9. All crystals have fixed geometrical shapes

10. All crystals have fixed geometrical shapes