Chemistry Test
How many electron pairs are shared between the carbon atoms in C2H4?
2
In carbon disulfide, how many lone pairs of electrons are shared on each sulfur atom?
2
How many resonance structures are possible for NO3-?
3
Use VSEPR theory to decide which one of the following ions and molecules is likely to be planar. (The central atom will be first)
BrF3
Which one of the following molecules contains a double bond?
CH2O
Which of the following is a covalent compound? NA2O, CaCl2, Cl2O, CsCl, or Al2O3?
Cl2O
In which one of the following is the best Lewis structure a resonance structure? CO2, ClO3-, COCl2, NO2+, or HCN
ClO3-
Arrange aluminum, nitrogen, phosphorous, and induium in order of increasing electronegativity.
In, Al, P, N
In which one of the following molecules are all the bonds single? O3, POCL3, CO, COCL2, or N2H4?
N2H4
Use VSEPR theory to decide which one if the following molecules and ions will have a trigonal pyramid geometry? (central atom is first)
PCl3
Which of the following elements is the most electronegative? S, Ru, Si, Te, or Cs?
S
In which of the following is the best Lewis structure a resonance structure? SO3, BF3, I3-, SCO, or SO3^2-
SO3^2-
Which of the following has no net dipole moment? N2O, NF3, H2Se, TeO3, or CH3Cl?
TeO3
electronegativity
ability of an atom in a covalent bond to attract the shared electron pair
polar covalent bond
covalent bond in which the shared electron pair is not shared, but remains closer to one atom than the other
In the nitrate ion (NO3-), nitrogen and oxygen are held together by...
covalent bonds
As ionic size increases, lattice energy ______.
decreases
electronegativity ____ down a group as atomic size ______.
decreases, increases
bond length
distance between the nuclei of the bonded atoms
How is an ionic bond formed?
electrons are transferred by a metal to a nonmetal to form ions that attract to give a solid compound
A molecule which contains polar bonds will always have a dipole moment. True or False?
false
According to VSEPR theory, a molecule with the general formula AX3E2 will be trigonal planar. True or false?
false
Un covalent bond formation, the potential energy reaches a maximum when the internuclear distance is equal to the bond length. True or False?
false
most electronegative element
fluorine
bond length ________ down a group and ______ across the period
increases, decreases
What affects lattice energy?
ionic size and charge
metallic bonding
metal bonds to a metal
ionic bonding
metal bonds to a nonmetal
nonmetals are ______ electronegative than metals
more
Is the nitrogen atom in NH3 in sp^2 hybridized?
no
covalent bonds
nonmetal bonds to a nonmetal
bond order
number of electron pairs being shared by a given pair of atoms
hybridization
process of orbital mixing
molecular polarity depends on
shape and bond polarity
Determine the shape of PCl3 and the decide on the appropriate hybridization of phosphorous in this molecule.
sp^3
Valence bond theory predicts that bromine will use ____ hybrid orbitals in BrF3.
sp^3d
When depicting polar bonds, the head of the arrow points towards_______
the more electronegative element
Use VSEPR theory to predict the electron group arrangement around iodine, the central atom in the ion IF2-.
trigonal bipyramidal
Covalently bonded substances do not necessarily exist as separate molecules. True or false?
true
The molecule AX2, where A and X are different elements, will have a dipole moment if the molecule is bent? True or false?
true
the octet rule
when atoms bond, they lose, gain, or share electrons to attain a filled outer level of 8 electrons
