Density, Physical & Chemical Properties & Changes
chemical properties
a characteristic that cannot be observed w/o changing or trying to change the composition of the substance
physical property
a characteristic that you can observe w/o changing or trying to change the composition of the substance
physical change
a form or appearance of matter changes but not the composition
examples of chemical properties
ability to burn
mass
amount of matter in an object
examples of vaporiztion
-boiling occurs below surface -evaporation occurs at surface
vaporization
change from liquid to gas
examples of physical changes
changes in shape, dissolving, changes in state
examples of chemical changes
color, enery, odor, formation of gas or solid
independent physical properties
density, melting/ boiling point, solubility, attraction, state of matter, color
volume
how much space an object takes up
dependant physical properties
mass, weight, volume
density
relationship between the mass of the substance and the volume. d=m/v
chemical changes
substances are changed into different substances while the composition changes
sublimation
substances change directly from solid to gas
melting point
temperature that a solid changes to a liquid
energy
the ability to cause change
freezing point
the temperature that a liquid becomes a solid
thermal energy
total energy in motion in all the particles in a substance
law of conservation
total mass of the matter is the mass before and after a physical or chemical change
condensation
when gas cools, the particles slow down enough for attraction to bring them together forming droplets of water. gas-liquid
