Chemistry test #1

matter

anything that takes up space/has mass

mass

measurement of matter

weight

measurement of matter and the effect gravity has on it

volume

amount of space being taken up by matter

solid

constant shape and volume

liquid

no constant shape but constant volume

gas

no constant shape or volume

neutron star

dying star that is very dense

plasma

super heated gas that behaves like liquid

physical property

a characteristic observed without changing the substance

chemical property

can only be observed by changing the substance

Law of conservation of mass

matter cannot be created or destroyed only turned into something new

physical change

change when the identity of substances stays intact

chemical change

change when the identity of substances changes

homogenous mixture

uniform/no separation

heterogenous mixture

not uniform/separation

filtering

separating by size/state of matter (ex. regular coffee)

decanting

pouring off the top layer (ex. Turkish coffee)

centrifugation

spinning that causes a separation by density (ex. criminal minds stuff)

distillation

separating by boiling point (ex. moonshine)

atom

simplest form of matter that retains the properties of that matter

element

a type of atom

molecule

2 or more atoms bonded

compound

type of molecule made of 2 or more elements bonded

pure

1 type of element or compound that cannot be separated by physical means