Classification of Matter, Physical States and Changes

Matter

One unique type of molecule

PURE SUBSTANCE, One type of atom in the molecule, ELEMENT, Example, More than one type of atoms in the molecule, COMPOUND, Example:

More than one type of molecules

MIXTURE, Matter evenly distributed, HOMOGENEOUS, Example, ...that is..., The composition is constant in the sample, Matter unevenly distributed, HETEROGENEOUS, Example, ...that is..., The composition is not constant in the sample

Physical States

Solid (s)

Volume ..., fixed

Shape, fixed

Liquid (l)

Volume ..., fixed

Shape, that of the container

Gas (g)

Volume ..., that of the container

Shape, that of the container

Examples

States of Matter

Change

Systems:

initial, reactants

final, products

Process

the type of molecules remains constant, PHYSICAL CHANGE, There is no change in the type of molecules

new types of molecules appear, CHEMICAL CHANGE, New types of molecules are formed