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19 Cards in this Set

  • Front
  • Back
what are electronegativity numbers used for
used to determine bond type/ polarity of a bond
ionic bond
transfer of electrons
covalent bond
sharing of electrons
what type of elements make up an ionic bond
a true metal and nonmetal; one element to the left and right of the zigzag line
what type of elements make up a covalent bond
2 nonmetals; both elements to the right of the zigzag line
what are 2 characteristics of ionic bonds
high melting point and soluble in water
what are two types of covalent bonds
polar and nonpolar/pure
explain polar
when the electronegativity difference is small but not zero; an unequal sharing of electons. (2 diff elements) ex. H20; C0
explain nonpolar/pure
when the electronegativity difference is zero; equal sharing of electons
molecule
no charge
polyatomic
has charge
define mole
an exact quantity
what are some example of representative particles
atoms, ions, molecules, formula units.
what are two equivalents for mole problems?
1 mole= AMU's in grams
1 mole= 6.02 x 10 to tha 23 r.p.
what name is associated w/ 6.02 x 10 to tha 23 r.p.
molecule
what does AMU stand for
atomic mass unit
define molecular and formula mass
the sum of the atomic masses of the atoms in a compound
what is percentage composition?
the precentage of the total mass of a compound contributed by an element is the precentage of that element in the compound.
How do you find the precent compositon of an element in a compound
ex. take the total atomic mass of the element x 100; then divide by formula mass of the compound.