Part 3 Flashcards
this is the ability of atoms to attract electrons in a bond
Electronegativity
difference in electronegativity for nonpolar covalent bond
<0.4
difference in electronegativity for polar covalent bond
0.4< ^EN < 1.7
difference in electronegativity for ionic bond
^EN >~ 1.7
is the force that holds two atoms together
Chemical Bond
is formed by the attraction of the positive nucleus of one atom and the negative electrons of another atom
Bond
these are the different types of chemical bonds
Metallic, Covalent, Ionic
this is the attraction between the electropositive atoms and the delocalized electrons within the metal lattice
Metallic Bond
this is the attraction resulting from the sharing of electrons of atoms
Covalent Bond
this results in the overlap of orbitals of the atoms
Covalent Bond
this basically means “same valency”
Covalent
this is the resulting bond when two nonmetals combine
Covalent Bond
this results from the attraction of the nucleus and the electron of two or more atoms
Covalent Bond
this is the attraction resulting from the transfer of electrons between atoms (MRII)
Ionic Bond
results when atoms of a metal (low electronegativity) and a nonmetal (high electronegativity) combine
Ionic Bond
results from the attraction of two opposite charged particles (MRII)
Ionic Bond
this type of bond involves a metal and a nonmetal
Ionic Bond
polarity of bonding is dictated by
electronegativity
this shows the direction of flow in a covalent bond; the direction of arrows
dipole moment
bonding interactions are characterized by
bond energy, bond length, bond order
what are the Properties of a Chemical Bond
- Bond Energy; 2. Bond Length; 3. Bond Order
this is the amount of energy involved when a bond is broken, which is of the same magnitude for the energy released when a bond is formed
Bond Energy
is the distance between the nuclei of the atoms forming the bond
Bond Length
is the number of bonds between two atoms in a covalent bond
Bond Order
pertains to single bond, double bond, triple bond, and those intermediate between single and double bonds
Bond Order
give the trend of the properties of bonds
^^ Bond Order, ^^Bond Energy , lower Bond Length
therefore, ^^ Bond Strength
what are the octet/duet rule’s strict followers
H, O, N, F
this is the apparent charge of an atom in a molecule
Formal Charge
the observed tendency of each atom of the main group elements to lose, gain, or share electrons in order to acquire 8 electrons in its valence shell resulting in the same electron configuration as a noble gas
Octet Rule
this rules is especially applicable to carbon, nitrogen, oxygen, and the halogens, but also to metals such sodium and magnesium
Octet Rule
this represents the arrangement of valence electrons among the atoms in a molecule.
Lewis Structure
these are cases wherein there is more than one Lewis Structure to represent a molecule or polyatomic ion
Resonance Structure
this vary in their contribution to the true structure of the molecule or ion. Some of “this” are equivalent and contribute equally to the true strunture
Resonance Structure
the model used for the approximation of molecular geometry is
VSEPR or valence shell electron pair
this states that the structure around an atom is determined principally by minimizing electron pair repulsions
VSEPR or valence shell electron pair
this type of geometry only considers the arrangement of the bonds, ignoring the lone pairs
Molecular geometry
this type of geometry considers the arrangement of all electron pairs
Electron pair geometry
what is the meaning of IMFA
Intermolecular Forces of Attraction
collective term for all the interactions of all the molecules
Van der Waals Forces
what are the three types of IMFA
- London Dispersion Force (LDF)
- Dipole-Dipole Interaction (DDI)
- Hydrogen Bonding (HB)
this IMFA has a temporary or instantaneous dipole; this also exists in all molecules and atoms
London Dispersion Force (LDF)
what are the two factors that affect LDF and how do they affect it?
- Molar mass - direct proportional; higher mass molar mass means higher dipole
- Arrangement - the more linear, the stronger LDF
this IMFA is exhibited by polar molecules; has a permanent dipole; and is generally stronger than LDF
Dipole-Dipole Interaction (DDI)
this IMFA is a special type of DDI which is the strongest among the three
Hydrogen Bonding
this type of IMFA is present is the number is bonded to a highly electronegative atom (F,O,N)
Hydrogen Bonding
this type of interaction is technically not an intermolecular force (not IMFA) but is an interaction
Ion-Dipole Interaction
what are some of the properties that are affected by IMFA
- Directly Proportional:
- Boiling/Melting Point
- Heat of Vaporization/Fusion
- Viscosity
- Surface Tension - Inversely Proportional:
- Vapor Pressure
what are the general guidelines for assessment for the IMFA
- difference in molar mass, significantly large, LDF will dominate
- difference in molar mass, NOT significantly large, DDI will dominate
- Hydrogen Bonding will generally dominate