exam 3

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(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


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