Ch 4 Calculations Used in Analytical Chemistry Flashcards
Scientists throughout the world have adopted a standardized system of units known
as the
International System of Units (SI)
The ____ unit is a non-SI unit of
length that is widely used to express the
wavelength of very short radiation such
as X-rays
ångstrom (Å)
SI Base Units of:
Mass
Length
Time
Temperature
Amount of substance
Electric current
Luminous intensity
kg, m, s, K, mol, ampere, candela
_____ is an invariant measure of the quantity of matter in an object.
Mass
_____ is the force of attraction between an object and its surroundings, principally the earth
Weight
Relate mass and weight via a formula
w = mg
The _____ is the SI unit for the amount of a chemical substance. It is always associated with specific microscopic entities such as atoms,
molecules, ions, electrons, other particles, or specified groups of such particles
as represented by a chemical formula.
mole
The _________ of a substance is the mass in
grams of 1 mole of that substance.
molar mass M
The ___________of a solution of a solute species X is the number of moles of that species that is contained in 1 liter of the solution
molar concentration
_______________ is the total number of moles of a solute, regardless of its chemical state, in 1 L
of solution.
Molar analytical concentration
_________ is the molar concentration of a particular species in a solution
Molar equilibrium concentration
_______ expresses the mass of a substance per unit volume. It is expressed in units of kg/L or
alternatively g/mL.
Density
_______ is the ratio of the mass
of a substance to the mass of an equal
volume of water.
Specific gravity
__________ is the quantitative relationship among the amounts of reacting chemical species. T
Stoichiometry
An __________ gives the simplest whole number ratio of atoms in a chemical compound.
empirical formula
