1. Solids Chemistry Mrs. Coyle

2. Solids Atoms vibrate about fixed positions.

3. Properties of Solids Depend on their arrangement of their atoms.

4. Melting Points Temperature at which a solid changes to a liquid. Vibrations of particles are strong enough to overcome the attraction that holds them in fixed locations. Melting point is same as freezing points.

5. Melting Points of Ionic and Molecular Solids Ionic Solids have high melting points because strong forces are holding the particles together. Molecular Solids have lower melting points. Not all solids melt (ex. Wood, cane sugar, some plastics)

6. Most Solids are Crystalline Unit cell : the smallest group of particles that retains the shape of the crystal. Crystal Lattice: a repeating array of unit cells.

8. Simple Cubic,Body-Centered and Face-Centered

9. Allotropes Two or more different molecular forms of the same element in the same physical state.

10. Allotropes of Carbon Diamond Graphite Bucky Balls

11. Buckminsterfullerene “Bucky Ball”

12. Amorphous Solids No order internal structure Examples: glass, plastics, asphalt