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sum of the atomic masses of all atoms in a compound as represented in a chemical formula; measured in amus
chemical formula that gives the simplest whole number ratio of atoms of elements in a compound
mass of each element in a coup mound relative to the total mass of the compound; found by dividing the mass of the element by the mass of the compound and multiplying the quotient by 100 percent
Solve mass to mass problem
go to grams to moles to moles and back to grams; balance the equation first
a reactant that is completely used up in a chemical reaction and that therefore determines the maximum amount of a product that can be formed
study of quantitative relationships that can be derived from chemical formulas and equations
if a series of reactions are added together the enthalpy change for the net reaction will be the sum of the enthalpy changes for the individual steps
making a solution
1. disassociation- particles separate;needs energy
2. solvation- reaction between solvent and solute;energy is released
concentration of a solution determined by the number of moles of a solute over kilogram of solvent
what does adding solute do to the colligative properties?
lowers vapor pressure, raises boiling point, lowers freezing point
constant @ equilibrium
the rate of the forward reaction and the reverse reaction/concentrations of reactants and products
amount of heat energy required to raise the temperature of 1 gram of a substance by 1 degree celsius
amount go heat energy needed to raise the temperature of a given sample of matter by 1 degree Celsius
movement of atoms or molecules through an opening so tiny that they pass through one particle at a time into an evacuated chamber
equilibrium condition for a reaction in which all the reactants and products are in two or more different states
Le Chatelier's principle
a reversible reaction at equilibrium will shift to offset a stress or change in conditions imposed on the system
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