Covalent Compounds

Knowing that the electronegativity of C is 2.5 and that of F is 4.0, pre-dict the character of the C---F bond in CF4 a) polar covalent b) nonpolar covalent c) ionic d) metallic

a) polar covalent

The correct formula for tetraphosphorus decaoxide is

P4O10

The less the electronegativity difference between two bonded atoms is, the greater the______ of the bond a) covalent character b) ionic character c) metallic character d) both b and c

a) covalent character

Two atoms with an electronegativity difference of _____ will likely form a polar covalent bond a) 0.1 b) 1.0 c) 2.5 d) 4.0

b) 1.0

One can predict the shape of a molecule by drawing its Lewis structure and a) balancing the oxidation numbers b) accounting for nonbonded pairs of valence electrons c) determining the empirical formula d) identifying the presence of polyatomic ions

b) accounting for nonbonded pairs of valence electrons

A lewis dot structure does not show a) valence electrons b) bond energies c) bonds d) atoms

b) bond energies

A covalent bond is formed when two atoms...

share one or more pairs of electrons with each other

When joining with atoms to form a covalent compound, the nitrogen atom can form a) one double bond b) one single bond and one double bond c) one single bond and one triple bond d) two double bonds

b) one single bond and one double bond

Bonding in molecules or ions that cannot be correctly represented by a single Lewis structure is represented by a) covalent bonding b) resonance structures c) single bonding d) double bonding

b) resonance structures

A polar covalent bond forms between A and B when a) the electronegativity difference is zero b) the molecular orbital is found nearer one atom c) the bond produces two ions d) the bond is increased by the shape of the molecule

b) the molecular orbital is found nearer one atom

In which of these compounds is the bond between the atoms NOT a nonpolar covalent bond? a) Cl2 b) H2 c) HCl d) O2

c) HCl

Even though the following molecules contain polar bonds, the only polar molecule is a) CCl4 b) CO2 c) NH3 d) CH4

c) NH3

As atoms bond with each other, they a) increase their potential energy, thus creating less-stable arrangements of matter b) decrease their potential energy, thus creating less-stable arrangements of matter c) increase their potential energy, thus creating more-stable arrangements of matter d) decrease their potential energy, thus creating more-stable arrangements of matter

d) decrease their potential energy, thus creating more-stable arrangements of matter

A compound that vaporizes readily at room temperature is most likely to be a(n) a) dipolar compound b) ionic compound c) metal d) molecular compound

d) molecular compound

The boiling point of water (H20) is higher than the boiling of hydrogen sulfide (H2S) because the water molecule is a) less polar b) more covalent c) ionic d) more polar

d) more polar

The correct name for the compound P2O5 is

diphosphorus pentoxide