chemistry unit 5 test

representative particle definition

the smallest unit of a substance that retains it chemical properties which can be atom, molecule, or formula unit

representative particle equation

number of moles x 6.022×10²3

mole

a unit of measurement that represents a specific number of particles

percent composition definition

the percentage by mass of each element in a compound

percent composition formula

mass of element/total molar mass of compound x 100%

empirical

simplest ratio of atoms - lowest whole number ratio

molecular

true number of atoms in compound

standard temperature

0 degrees celcius

standard pressure

1 atm or 101.325 kilopascals

molar mass

the mass of one mole of a substance g/mol

how to find molar mass

equal to atomic mass of an element on the periodic table

diatomic elements

Bromine, Iodine, Nitrogen, Chlorine, Hydrogen, Oxygen, Fluorine

percent composition equations

part/whole x 100 or part = whole x %/100