BJU Physical Science Chapter 2

matter

anything that takes up space and has mass

mass

the amount of matter in an object

weight

the force of gravity acting on the matter in an object

pure substance

a material made of only one kind of element or compound(is not a mixture)

element

a pure substance that consists of atoms with the same atomic number

compound

a pure substance consisting of atoms of two or more different elements that are chemically combined

heterogeneous mixture

does not have a uniform appearance since the substance is unevenly distributed

homogeneous mixture

when different substances are mixed so that they have a uniform appearance throughout

viscosity

a measure of a fluid’s resistance to flowing

physical change

any change in matter that does not alter the composition of a substance

chemical change

changes that alter the chemical composition of a substance

melting

solid to liquid

freezing

liquid to solid

melting point

the temperature at which a solid turns to a liquid

vaporization

liquid to gas

evaporation

slow form of vaporization

boiling

faster form of vaporization

boiling point

the temperature at which a substance boils

condensation

gas to liquid

sublimation

solid to gas

deposition

gas to solid

physical property

anything about a substance that can be observed or measured without altering the substance’s chemical composition

chemical property

describes how a substances changes in the presence of another substance under certain conditions