17 terms

Chemistry Chapter 12 Vocabulary

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Excess reactant
a reaction that remains after a chemical reaction occurs
Limiting reactant
a reagent that runs out first, limits how far the reaction can go, causes the reaction to stop
Mole Ratio
In a balanced equation, the ratio between the # of moles in any 2 substances
Stoichiometry
a mathematical calculation dealing with the masses of reactants and products involved in a chemical equation
Atomic mass unit (amu)
the # which indicates the combined # of protons and neutrons - 1 amu = 1.66*10 ^-24 g
Coefficient
whole #'s used to balance the # of atoms on each side of the equation
Dimensional Analysis
used to convert units of measurements - #'s are expressed can be multiplied without the changing mole value
Empirical Formula
formula giving the proportions of elements present in a compound, but not the # or arrangement
Formula unit
the simplest ratio of ions present in an ionic compound
Formula weight
a quantity composed by the atomic weight of each element by the # of atoms
Hydrate
Substances that include water in the formula (not actually part of the formula)
Molar Mass
Combined amount of all masses in matter (measured in mole)
Mole
abbreviation for the SI unit for a quantity of matter - similar to "chemists dozen"
Molecular formula
expresses info about proportions of a chemical compound using a single line
Molecular weight
weight measured by the sum of the atomic weights of atoms
Percent Composition
% of total mass of the compound due to the components
- Mass of component / total mass X 100 = %
Pure Substance
matter that is uniformly distributed and consists of only 1 particle