chem and physical properties

Pure substances

• samples are identical

• Each has distinct properties

• Can’t be decomposed physically

elements

• Pure substance sub category

• Fundamental substances (Anything on the periodic table)

compounds

• pure substances sub category

• 2+ Elements in fixed definite proportions

Mixtures

• 2+ pure substances that retain their chemical identities

• Can be separated by physical means

• Proportions aren’t fixed and can vary between samples

Homogenous

• Uniform (properties and composition are consistent)

• Clear

Heterogenous

• Nonuniform composition (composition isn’t consistent)

• Cloudy and murky

Chemical properties

Tendency to react under certain conditions

Any ______ changes are ______ reactions

Physical properties

• Measured/demonstrated without altering the chemical identity

• _____ changes maintain chemical identity

Intensive properties

• Doesn’t depend on the amount of material

• Often ratios of extensive properties

Extensive Properties

• Depends on the amount of material