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
A triple covalent bond shares how many total electrons?
6
__________ bonds form between single bonds.
sigma
alpha
beta
pi
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
What is the shape of H2O?
bent
How many pi bonds are there in a triple bond?
1
3
2
Molecular compounds are generally composed of what kinds of atoms?
non-metals
Unequal sharing of electrons between two bonded atoms ALWAYS indicates __________________.
a polar covalent bond
an ionic bond
a nonpolar covalent bond
a polar ionic bond
Which of the following elements has the greatest electronegativity?
Chlorine
Fluorine
Bromine
Iodine
Intermolecular attractions are _________ than either ionic or covalent bonds.
none of these
both weaker and stronger
weaker
stronger
Shape of AsBr3
trigonal pyramidal
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
Shape of CO2
linear
Water is an example of a ___________ molecule
non-polar
---
ionic
polar
How many pairs of electrons are shared in a double covalent bond?
2 pairs
The VSEPR model is mainly used to __________________________________.
measure intermolecular forces
determine ionic charge
write resonance structures
determine molecular shape
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
Special properties of water, such as adhesion, cohesion, and surface tension can be attributed to which intermolecular force?
Hydrogen bonds
Van de waals forces
london dispersion forces
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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.
________________ occur when polar molecules are attracted to one another.
Dipole interactions
ionic compounds
none of the above
hydrogen bonds
Covalent bonds form when atoms ________ electrons.
share
what is the shape of CCl4
tetra-hedral
Which of the following elements has 4 valence electrons?
Sulfur
Nitrogen
Carbon
Boron
____________________ is the energy required to break the bond between two covalently bonded atoms.
Resonance energy
Hybridization energy
none of the above
Bond dissociation energy
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