Download Section 2 Properties of Matter

Ch 18
Section 2
Properties of Matter
Physical Properties
  Characteristic of a material that you can observe
without changing the identity of the substances
that make up the material.
  Ex: color, shape, size, density, melting point, and
boiling point.
Behavior
  Attraction to a magnet is a physical property of the
substance iron.
  The way substances behave in different situations
can help classify a substance.
Using physical properties to
separate
  Separate into size
  Separate into the how substance reacts to
situations.
  Ex: does the substance react to a magnet.
Physical change
  A change in size, shape, or state of matter.
  A physical change does not change the substance
itself
Distillation
  The process for separating substances in a mixture
by evaporating a liquid and recondensing its vapor.
Chemical property
  A characteristic of a substance that indicates
whether it can undergo a certain chemical change.
Chemical Change
  A change of one substance to another.
  Ex: Burning and rusting are chemical changes.
Determination of Chemical
Reaction
  Clues such as heat, cooling, or the formation of
bubbles or solids in a liquid are helpful indicators
that a reaction is taking place.
  However, the only sure proof is that a new
substance is produced.
Using Chemical Change to
Separate
  Many metals are separated from their ores and
then purified using chemical changes.
Weathering of the earth
  Chemical and physical change:
  Physical- rocks splitting, sand dunes shifting, water
forming canyons.
  Chemical- acid rain changing the rock into new
substances.
Law of conservation of
Mass
  The mass of all substances that are present before
a chemical change equals the mass of all the
substances that remain after the change.
  What happens when log is burned?