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