test 4 Flashcards
There are 4 shared electrons in a single covalent bond.
False, 2
The most electronegative atom in a molecule will be found in the
center of the molecule.
False, least
Polyatomic ions are held together by covalent bonding.
True
There are a total of 24 valence electrons available for bonding the
sulfur trioxide molecule.
True
The ozone molecule (O 3 ) will have a 120 degree bond angle.
True
There are two lone pairs of electrons on the iodine in the IF 2 1- ion.
False, 3
Sulfur hexafluoride will exhibit an octahedral molecular geometry.
True
How do we name molecules?
Using a prefix system
How do we write chemical formulas for molecules?
The prefixes are used to
describe the number of atoms of that element present in the molecule
(subscripts)
What 2 familiar compounds use common names instead of systematic names?
Water and ammonia (H 2 O and NH 3
Why does it form?
Give atoms a noble gas configuration (octet)
What is a covalent bond?
Force between nonmetal atoms
What does it form?
molecule
How does it form?
localized sharing of valence electrons
How many electrons can be shared in a covalent bond?
Six max between two
atoms (triple bond)
What are the nonbonding electrons called?
Lone pair electrons
Why are nonbonding electrons sometimes present on atoms?
Get to noble gas
arrangement in conjunction with bonded electron pairs
How can we represent covalent bonding visually?
Lewis dot diagram
What exceptions exist to the octet rule?
H, Be, B, and expanded valence
How do we create Lewis structural diagrams?
Six steps – see your notes.
What is VSEPR?
Valence shell electron pair repulsion model - used for predicting
shapes of molecules
What is a steric number?
Number of bonds + number of lone pairs on central
atom
What is molecular geometry?
Shape of molecule
What is a bond angle?
Angle between bonds in molecule
