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