chapter 7
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phut52
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202157
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chapter 7
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2013-03-05 16:38:28
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chapter 7 chem
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can also be used to determine the number of atoms present in a specific mass of an element
atomic mass
mass of a single atom of that element
atomic mass written under the symbol on the periodic table
sum of the atomic masses of all the atoms in its formula
formula mass
particles such as atoms, molecules, and ions are counted by the
mole
the unit of mole contains
6.022X10 to the 23 power items
the number of items in a mole, equal to 6.022X10 23 power
avogadros number
a group of atoms, molecules, or formula units that contain 6.022X10 23 power of items
mole
group of ions given by the formula of an ionic compound
formula units
quanitity in grams that equals the atomic mass of that element
molar mass
to determine the molar mass of a compound
muliply the molar mass of each element by its subscript in the formula and add the results
used to change from moles of a substance to grams or from grams to moles
molar mass
mass percent of each element present
percent composition
the actural or true formulas of compounds
molecular formulas
formula that represents the lowest whole-number ration of the atoms in a compound
empirical formula
the percent by mass of the elements in a formula
percent composition
atom which forms the most bonds
central atom
- (dash)=
2 dots or 2 electrons
the ability of an atom to attract valence electrons
electronegativity
electronegativity of 0.5-1.7
polar
electronegativity of 0-0.4
nonpolar
electronegativity = to or greater than 1.8
ionic
nonsymetrical
polar
symtetrical
nonpolar
sum of atomic mass (weight) of all atoms in its formula
formula mass
round addition and subtraction answersÂ to lowest number of
decimal places
round multiplication and division answers to lowest number of
sig figs
a unit that contains 6.022X10 to the 23 power number of items or particles (atom,moleculs, ions)
mole
given particles------find number of moles
divide
given moles-------------find number of particle
multiply
contain two atoms
diatomic element
list the diatomic elements
Hydrogen
Nitrogen
Oxygen
Fluorine
Chlorine
Bromine
Iodine