1. States of Matter

States of Matter and Their Properties Matter exists in three states: solid , liquid , and gas . The physical form a substance takes depends on the separation,…

The Kinetic Particle Theory The kinetic particle theory is the model scientists use to explain the properties of solids, liquids and gases in terms of the…

Changes of State A change of state is a physical change - no new substance is formed, and the change can be reversed. Melting (solid → liquid): particles…

What Causes Gas Pressure? Gas particles are in constant, random motion and are constantly colliding with the walls of their container. Each collision exerts a…

What is Diffusion? Diffusion is the net movement of particles from a region of higher concentration to a region of lower concentration, as a result of their own…