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chem word wall

Law explains what happens. Has been proven true
Theory Explains why something happens. Has not been proven true
Accuracy an agreement of a particular value with the true value
precision an agreement of several measurements made in the same way
heterogeneous different throughout a solution
homogeneous same throughout a solution
extensive properties depends on the amount of matter that is present
intensive properties do not depend on the amount of matter present
physical change a change in a substance that doesn't involve a change in identity
chemical change a change where a new substance is formed
condensing gas to liquid
sublimination solid to gas
deposition gas to solid
empirical formula smallest whole number or atoms
molecular formula the actual number of atoms of each element
structured formula uses lines to represent covalent bonds
mixture two or more substances that are not chemically combined
element simplest form of a pure substance
compound pure substances that are combinations of elements
heat of vaporization the heat needed to convert a liquid to gass
heat of fusion heat needed to convert a solid to liquid
chemistry study of composition and structure of matter
matter anything that has mass and occupies space
atomic number number of protons
atomic mass number of neutrons + electrons
isotope atoms of the same element w/ different atomic masses because of different numbers of neutrons
avagadros' number 6.02 x 10 23rd
electron config. the way electrons are arranged in an atom
valance electrons electrons in an incomplete outer energy level
Aubau principle electrons enter orbits of lowest energy level
pauli exclusion principle an atomic orbital may describe at most 2 electrons
Hunds Rule when electrons occupy orbitals of equal energy, one electron enters each suborbital until all the orbitals contain 1 electron pair w/ parallel signs
periodic law physical & chemical properties of the elements are periodic functions of their atomic number
atomic radius distance from center of nucleus to outer energy level
ionization energy energy required to remove an electron from an atom
electron affinity energy associated with the addition of an electron
cation positive ion
anion negitive ion
electron negitivity measure of the ability of an atom in a chemical compound to attract electrons
solvet what the solid is dissolved in
solute the solid that dissolves in the liquid
saturated the solvent can't dissolve anymore
unsaturated the solvent can dissolve more
supersaturated past saturation
miscible liquids will mix together
immiscible liquids will NOT mix together
diluting adding more solvent
concentrating adding more solute
law of conservation of mass mass of reactants = mass of products
reactants compounds to the left of the arrow
synthesis A+B -> A+B
Decomp AB -> A + B
single replacement AB + C -> AC + B
double replacement AB + CD -> AD + CB
Created by: fodge91