Unit 2 Matter I hope this is what we were supposed to do, please let me know what you think.

Subatomic Particles

Atomic Number

Isotopes

Mass Number

Average Atomic Mass

States of Matter

Kinetic energy of each state Properties: Arrangement of Particles Attractive forces between particles: Kinetic energy of particles: Particle Motion: Solid: Orderly 2) Closely Packed Very Strong Very Low Vibrate and rotate About a fixed position Liquid: 1) Disorderly 2) Less closely packed than a solid. Strong Low Slide over each other Gas: 1) Disorderly 2) Very far apart Very weak High Move about at great speeds.

Changes in State

Thermal Energy/Heat/Temperature Thermal Energy – the total amount of kinetic and potential energy of an object. Heat – the movement of thermal energy from hot to cold. Heat always moves from hot to cold. Temperature – the average kinetic energy of all the particles in an object.

Physical Properties

Physical vs. Chemical Properties

Physical Change vs. Chemical Change Change in shape Change in identity of the substance - rust

Physical Changes

Chemical Changes

Evidence of Chemical Change Energy change precipitate Gas formed Color change

Exothermic vs. Endothermic Exothermic reaction - heat is released, becomes hot Endothermic reaction - heat is absorbed, becomes cold

Law of Conservation of Mass