Chapter 3

14 cards·by authentic_yauni

mass of the atom in amu (atomic) mass units

atomic weight or amu

the amount of substance that contains as many elementay entities (atoms, molecules, particles)

mole (mol)

mass in grams of a substance

molar mass or atomic mass unit(g/mol or kg/mol)

the sum of the atomic mass in (amu)

molecular mass

is the percent by mass in an element

percent composition by mass

a process in which a substance(s) is changed into one or more new substances

chemical reaction

uses chemical symbols to show what happens during a chemical reaction

chemical equation

the starting materials in a equation

reactants

the result of a chemical equation

products

is the quantitive study of reactants and products in a chemical reaction

stoichiometry

use moles to calculate the amount of product formed

mole method

proportions indicated by the balanced equation

stoichiometric amounts

the reactant used up first in the in a reaction

limting reactant

are the reagents present in quantities greater than necessary to react with the quantity of the limiting reactant

excess reagants