Chem Definitions Flashcards
Molar mass
The mass in grams of one mole of that substance
Molar concentration
The number of moles of solute per unit volume of solution.
Electronegitivity
A measure of the tendency of an atom to attract a bonding pair of electrons
Intermolecular bond
A bond occurring between atoms within molecules
Lewis structure
Are diagrams that represent the outer shell of electrons and show the bonding between atoms of a molecule.
Octet rule
Elements tend to combine in such a way that each atom has eight electrons in its valence shell, giving it the same electron configuration as a noble gas.
Valence electrons
Outer shell electrons
Bond energy
Energy absorbed when bond breaks/ energy released when bond forms
Bond length
Length of bond between the atoms (measured in pm- pico metres)
Polar covalent bond
A chemical bond that forms when two non-metal atoms share electrons unequally due to the difference in their electronegativity.
Dative covalent bond
This type of bond is a description of covalent bonding that occurs between two atoms in which both electrons shared in the bond come from the same atom.
What does VSEPR stand for
Valence shell electron Pair repulsion
Intramolecular bonds exist…
Intramolecular bonds exist between molecules
Intermolecular bonds exist…
Intermolecular bonds exist between molecules or between atoms of noble gases.
London forces properties
-the weakest intermolecular force
-is a temporary attractive force that results when the non-polar molecules form temporary dipoles.
-electrons are mobile and can be found at one end of a molecule, thus inducing a temporary dipole.
-low boiling point
-Low IMF
-tetrahedral.
