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