Unit_6_Notes - Unit 6 Solids, Liquids and Solutions 13.2...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Unit 6 – Solids, Liquids and Solutions 13.2 The Nature of Liquids I. A Model for Liquids A. Liquids are Fluids 1. Substances that can flow and therefore take the shape of their container B. Liquids have Relatively High Density 1. 10% less dense than solids (average) a. Water is an exception 2. 1000x more dense than gases C. Liquids are Relatively Incompressible 1. The volume of liquids doesn't change appreciably when pressure is applied D. Liquids have the Ability to Diffuse 1. Liquids diffuse and mix with other liquids 2. Rate of diffusion increases with temperature ( average Kinetic Energy) E. Evaporation and Boiling 1. Evaporation a. Molecules with sufficient kinetic energy escape as vapor from the surface of the liquid 2. Vapor Pressure a. A measure of the force exerted by a vapor above its liquid 3. Boiling a. The change of a liquid to bubbles of vapor that appear throughout the liquid b. The normal boiling point is the temperature at which a substance boils at 101.3 kPa c. The boiling point of a substance decreases as the atmospheric pressure decreases F. Formation of Solids 1. Freezing (or Solidification) a. The physical change of a liquid to a solid by removal of heat Solid Liquid Gas 13.3 The Nature of Solids I. A Model for Solids A. Types of Solids 1. Crystalline Solids - substances in which the particles are arranged in an orderly, geometric, repeating pattern 2. Amorphous Solids - substances in which the particles are arranged randomly B. Definite Shape and Volume C. Definite Melting Point 1. Melting is the physical change of a solid to a liquid by the addition of heat 2. Melting point is the temperature at which a solid becomes a liquid a. Crystalline solids have definite melting points b. Amorphous solids do not have definite melting points D. High Density and Incompressibility E. Low Rate of Diffusion 1. Two solids in contact will experience VERY SLOW rates of diffusion
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 II. Crystalline Solids A. Crystal Structure 1. The total three dimensional arrangement of particles of a crystal B. Unit Cell 1. The smallest portion of a crystal lattice that shows the three-dimensional pattern of the entire lattice III. Amorphous Solids A. "Amorphous" 1. Greek for "without shape" B. Formation of amorphous solids 1. Rapid cooling of molten materials can prevent the formation of crystals a. Glass b. Obsidian 13.4 Changes of State I. Boiling and Condensation A. Boiling 1. The conversion of a liquid to a vapor within the liquid as well as at its surface. It occurs when the equilibrium vapor pressure of the liquid equals the atmospheric pressure B. Boiling Point 1. The temperature at which the equilibrium vapor pressure of the liquid equals the atmospheric pressure a. Water boils at 100 ° C at 1 atm pressure b. Water boils above 100 ° C at higher pressures c. Water boils below 100 ° C at lower pressures C. Condensation 1. The conversion of a gas to a liquid by the removal of energy II. Freezing and Melting A. Freezing Point 1. The temperature at which the solid and liquid are in equilibrium at 1 atm
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/12/2011 for the course CHEM CHEM 2B taught by Professor Cabrera during the Spring '09 term at San Jose City College.

Page1 / 9

Unit_6_Notes - Unit 6 Solids, Liquids and Solutions 13.2...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online