exam 3
(bond type) C+H=
nonpolar
The F-B-F bond angle in the BF3 molecule is ________.
120 degrees
The ion PO4 3- has ________ valence electrons
32
Phosphine, PH3, has ________ covalent pairs and ________ lone pairs.
3; 1
Determine the electron geometry (eg) and molecular geometry (mg) of CO2.
eg=linear, mg=linear
Determine the electron geometry (eg), molecular geometry (mg), and polarity of SO2.
eg=trigonal planar, mg=bent, polar
A chemical bond is classified as a covalent bond if it involves the transfer of electrons
false
The Lewis structure for O2 contains a triple bond.
false
The Lewis structure of oxygen should have 8 valence electrons
false
The Lewis theory predicts that the formula for a compound of magnesium and sulfur is MgS2.
false
The VSEPR theory predicts that the H-C-H angle in CH4 measures 120°.
false
The ammonium ion contains 10 valence electrons.
false
The compound H2S contains polar bonds but the molecule is nonpolar.
false
The electron geometry of a molecule is never the same as its molecular geometry.
false
The structure : HXH : is a proper representation of the bonding in the H2 molecule.
false
The sulfate ion contains 28 valence electrons
false
When you have 4 electron groups and 1 of them is a lone pair, the molecular geometry is bent
false
how to find the most polar bond
greatest electronegativity difference
(bond type) metal+nonmetal
ionic
The molecular geometry of the CS2 molecule is ________.
linear
(bond type) same nonmetals=
nonpolar
The phosphorus atom in PCl3 would be expected to have a
partial positive charge.
(bond type) different nonmetals=
polar
The molecular geometry of the PF4 + ion is ________.
tetrahedral
The molecular geometry of the CHF3 molecule is ________, and the molecule is ________
tetrahedral, polar
The molecular geometry of the PHCl2 molecule is ________.
trigonal pyramidal
The molecular geometry of the PF3 molecule is ________, and this molecule is ________.
trigonal pyramidal, polar
Bonding theories are used to predict how atoms bond together to form molecules.
true
Having eight valence electrons is very stable and is called an octet.
true
Lewis structures only use the valence electrons in determining the bonding
true
The VSEPR theory predicts that the angle between the central carbon atom and the two oxygen atoms in CO2 measures 180°.
true
The carbon-chlorine covalent bond is polar
true
The correct Lewis structure for CO2 shows that the molecule contains two double bonds
true
The double bond is shorter and stronger than a single bond.
true
The molecule CCl4 is a tetrahedral molecule
true
The most electronegative element is fluorine.
true
When you have 2 electron groups and none are lone pairs, the molecular geometry is linear.
true
When you have 4 electron groups, the electron geometry is tetrahedral.
true
Of the bonds C-C, C:C, and CXC, the C-C bond is ________.
weakest/longest
