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Biology ch #2.2
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Covalent Bond
two atoms attain stability by
sharing
electrons
Chemical Bond
attraction of 2 atoms, linking them together
-2 types (
covalent
and
ionic
)
Compound
A substance made up of molecules with 2 or more elements
Molecular weight
every compound has it
sum of all the atomic weights of all the atoms in a compound
electronegativity
attractive force that a nucleaus exerts on electrons
-depends on how many positive charges the nucleus has and the distance between electrons
nonpolar covalent bonds
the sharing of electrons egually
atoms must be close in electronegativity
polar covalent bonds
when electron are drawn to one nucleus more than the other
Polar
charges of atoms are found at opposite ends of the bond
Ions
electrically charged particles in an atom in the gain or loss of an electron
theres
cations
and
anions
Cations
positive charge
less electrons than protons
anions
negatively charged
more electrons than protons
Ionic Bonds
bonds formed as a result of electron attraction with opposite charges
Hydrogen Bonds
bond resulting from the attraction of a negatively charged atom to the positively charged atom
involves hydrogen
Hydro
philic
"water loving"
when polar atoms interact with water by hydrogen bonds
hydro
phobic
"water hating"
non polar molecules
nonpolar molecules attract to other nonpolar molecules
van der Waals forces
interactions between nonpolar substances
they occur when nonpolar molecules are in close proximity
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Author
Anonymous
ID
38893
Card Set
Biology ch #2.2
Description
ch 2.2 vocab
Updated
2010-10-01T04:42:48Z
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