1) the ammonium ion has the formula nh4+. how many nonbonding electrons must be
shown in the lewis structure of the ammonium ion?
a.0
b.4
c.8
d.9
2) sodium is a highly reactive metal and chlorine is a toxic gas, but when they come
together the resulting material, sodium chloride, is essential for life. which of the
following is true when sodium and chlorine are brought into contact with one another?
a.they form a heterogeneous mixture.
b.they form a homogenous mixture.
c.they neutralize each other.
d.they form a compound.
3) which of the following molecules is(are) polar?
a.ch3cl
b.hcn
c.both of them
d.neither of them
4) the mass of an electron is approximately which of the following?
a.1 amu
b.1 g
c.0.0005 amu
d.0.0005 g
5) which of the following give(s) the correct order of ionization energies?
a.li > na > k > rb
b.na > mg > p > cl
c.both a and b
d.neither a nor b
6) which is most likely true for an atom with one valence electron?
a.it will gain one electron.
b.it will gain two electrons.
c.it will lose one electron.
d.it will lose two electrons.
7) which of the following is true of ionic compounds?
a.they are liquids at room temperature.
b.they are solids in which individual molecules are present.
c.they are solids in which both cations and anions are present.
d.depending on the compound any one of the above may apply.
8) which of the following is true of polyatomic ions?
a.all are anions.
b.all are cations.
c.the vast majority are anions.
d.the vast majority are cations.
9) what is the name of scl2?
a.sulfur chloride
b.sulfur chlorine
c.monosulfur chloride
d.sulfur dichloride
10) consider the following lewis structure.
what is the correct name for this compound?
a.monphosphorus pentachloride
b.phosphorus chloride
c.phosphorus pentachloride
d.pentaphosphorus chloride
e.phophorus pentachlorine
11) which of the following is true in the carbonate ion, co3
2-?
a.all of the carbon to oxygen bonds are equivalent.
b.the carbon atom does not have an octet.
c.the carbon atoms form two single bonds and one double bond.
d.the electrons are constantly moving from one bond location to another.
12) which type of blood cells are involve in clotting?
a.erythrocytesc.thrombocytes
b.leukocytesd.all of these