Unit 3 Flashcards
molar mass
mass in grams of 1 mol of any substance
atomic weight (A.W.)
a mol of atoms
molecular weight (M.W)
for covalent molecules (g/mol)
formula weight (F.W.)
for formula units of ionic compounds (g/mol)
The set of empirical molar coefficients
the stoichiometry of any balanced equation
Law of mass conservation
states that the mass of reactants = mass of products
precision
2 measurements compared (are they the same?)
accuracy
compare to a true value
±5% rule
states that if 2 numbers are within ±5% of each other, then they are statistically the same
A pop test signifies a presence of…
hydrogen
complete ionic equations
require that all strong electrolytes be written out as their dissociated ions
spectator ions
a type of ion that occurs on both sides of the reaction arrow in the same form, and are not part of the chemical change
net ionic equations
complete ionic equations with the spectator ions emilinated
net ionic equations
complete ionic equations with the spectator ions emilinated
the net ionic equation for a precipitation reaction describes the…
formation of the precipitate
the net ionic equation for an acid-base neutralization reaction describes the…
formation of water
molar mass
the mass in grams of one mole of that element
Avogadro’s number
NA = 6.0221415 x 1023 objects = 1 mole
precipitates are weak or strong electrolytes?
weak
precipitation reaction
A reaction in which two soluble ionic compounds form an insoluble product, a precipitate.
precipitate
The insoluble product of a precipitation reaction.
molecular equation
A chemical equation showing a reaction in solution in which reactants and products appear as intact, undissociated compounds.
total ionic equation
An equation for an aqueous reaction that shows all the soluble ionic substances dissociated into ions.
net ionic equation
A chemical equation of a reaction in solution in which spectator ions have been eliminated to show the actual chemical change.
