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