A triple covalent bond shares how many total electrons?
6
The VSEPR model is mainly used to __________________________________.
write resonance structures
measure intermolecular forces
determine molecular shape
determine ionic charge
Covalent bonds form when atoms ________ electrons.
share
Special properties of water, such as adhesion, cohesion, and surface tension can be attributed to which intermolecular force?
Van de waals forces
---
london dispersion forces
Hydrogen bonds
In a coordinate covalent bond, ________________________________.
none of the above
electrons are shared equally
electrons are shared unequally
one atom contributes both electrons to a coordinate covalent
____________________ is the energy required to break the bond between two covalently bonded atoms.
Resonance energy
Bond dissociation energy
none of the above
Hybridization energy
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.
__________ bonds form between single bonds.
alpha
beta
pi
sigma
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
Which of the following elements has the greatest electronegativity?
Iodine
Chlorine
Bromine
Fluorine
How many pi bonds are there in a triple bond?
1
2
3
Shape of CO2
linear
Molecular compounds are generally composed of what kinds of atoms?
non-metals
Shape of AsBr3
trigonal pyramidal
Intermolecular attractions are _________ than either ionic or covalent bonds.
both weaker and stronger
weaker
none of these
stronger
Which of the following atoms would most likely form a diatomic molecule?
all of these
hydrogen
oxygen
nitrogen
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 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
________________ occur when polar molecules are attracted to one another.
hydrogen bonds
Dipole interactions
ionic compounds
none of the above
How many pairs of electrons are shared in a double covalent bond?
2 pairs
Unequal sharing of electrons between two bonded atoms ALWAYS indicates __________________.
a nonpolar covalent bond
an ionic bond
a polar covalent bond
a polar ionic bond
What is the shape of H2O?
bent
Which of the following elements has 4 valence electrons?
Sulfur
Nitrogen
Boron
Carbon
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