How does electronegativity influence the character of a bond between atoms?
The difference in electronegativity determines the character of a bond between atoms (determines if it will be polar or non-polar
In a coordinate covalent bond, ________________________________.
electrons are shared equally
electrons are shared unequally
none of the above
one atom contributes both electrons to a coordinate covalent
A triple covalent bond shares how many total electrons?
6
Which of the following elements has 4 valence electrons?
Nitrogen
Boron
Carbon
Sulfur
Unequal sharing of electrons between two bonded atoms ALWAYS indicates __________________.
an ionic bond
a polar ionic bond
a nonpolar covalent bond
a polar covalent bond
__________ bonds form between single bonds.
pi
alpha
beta
sigma
Water is an example of a ___________ molecule
ionic
polar
non-polar
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____________________ is the energy required to break the bond between two covalently bonded atoms.
none of the above
Bond dissociation energy
Hybridization energy
Resonance energy
Covalent bonds form when atoms ________ electrons.
share
Intermolecular attractions are _________ than either ionic or covalent bonds.
both weaker and stronger
stronger
none of these
weaker
Molecular compounds are generally composed of what kinds of atoms?
non-metals
Which of the following elements has the greatest electronegativity?
Chlorine
Bromine
Fluorine
Iodine
Shape of AsBr3
trigonal pyramidal
Compare and contrast polar covalent bond and non-polar covalent bond. Be sure to include information on electronegativity, electron sharing, etc.
Polar covalent bonds have an electronegativity diff.of 0.4-1.7; electrons aren’t shared equally. Non-polar electronegativity diff. of 0 shared equally
How many pairs of electrons are shared in a double covalent bond?
2 pairs
________________ occur when polar molecules are attracted to one another.
ionic compounds
Dipole interactions
hydrogen bonds
none of the above
Special properties of water, such as adhesion, cohesion, and surface tension can be attributed to which intermolecular force?
Hydrogen bonds
london dispersion forces
Van de waals forces
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How many pi bonds are there in a triple bond?
2
1
3
Compare and contrast the properties of ionic and covalent compounds.
ionic - crystalline structure, metals +nonmetals, high melting point. Covalent - nonmetals, properties vary, low melting point, etc see p. 253 for better list
The VSEPR model is mainly used to __________________________________.
write resonance structures
measure intermolecular forces
determine molecular shape
determine ionic charge
what is the shape of CCl4
tetra-hedral
Which of the following atoms would most likely form a diatomic molecule?
hydrogen
nitrogen
oxygen
all of these
What is the VSEPR model theory? What does it state?
States the electron pairs repel each other and determine both the shape of & bond angles in a molecule.
Shape of CO2
linear
What is the shape of H2O?
bent
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