1 / 19

Structures and Types of Solids

Structures and Types of Solids. TWO TYPES OF SOLIDS. 1. Crystalline solids highly regular arrangement of their particles crystals- at microscopic level. How are they crystals?. Lattice - 3-D system of points indicating position of ions, atoms or molecules that make up the substance.

nhi
Download Presentation

Structures and Types of Solids

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Structures and Types of Solids

  2. TWO TYPES OF SOLIDS • 1. Crystalline solids • highly regular arrangement of their particles • crystals- at microscopic level

  3. How are they crystals? • Lattice - 3-D system of points indicating position of ions, atoms or molecules that make up the substance

  4. Unit cell • Smallest repeating pattern of the lattice- extend in all directions for the structure

  5. Three Types of Cystalline Solids

  6. Two types of solids • 2. Amorphous solids- considerable disorder in their structure • EX- glass- liquid that is “frozen in place”

  7. Bonding models for metals • Model must account for physical properties: • A. shape can be changed fairly easily- malleable and ductile

  8. Bonding models for metals • B. durable • C. high melting points

  9. Bonding models for metals • Indicates the bonding is STRONG and NONDIRECTIONAL • or difficult to separate metals atoms, but easy to move them

  10. The model is... • Electron “sea”model • metal cations in sea of e- (mobile e- for conductivity and cations can be moved around when hammered

  11. Metal alloys! • Metals introduced into the crystal structure of other metals

  12. Alloy • A substance that contains a mixture of elements and has metallic properties

  13. Two types of alloys • Substitutional alloy- some of the host metal atoms are replaced by other metal atoms of similar size

  14. Substitutional alloys • EX: Brass (1/3 of copper atoms replaced with zinc) • Pewter (85%Sn, 7%Cu, 6%Bi, 2%At)

  15. Two types of alloys • Interstitial alloy- formed when some of the holes in a close packed metal structure are occupied by smaller atoms

  16. Interstitial alloy • EX: Steel (carbon atoms into iron) • Strengthens iron by adding strong directional bonds

More Related