1) a student is attempting to draw several resonance structures for a species. which of
the following is allowed?
a.change the connectivities of the nuclei.
b.change the number of paired and unpaired electrons.
c.both a and b
d.neither a nor b
2) what is the formula of the compound formed by an iron(iii) ion and oxygen?
a.feo
b.feo2
c.fe2o3
d.fe3o2
3) the preferred name for hco3 is hydrogen carbonate. what is the common name for
this ion?
a.bicarbonate
b.dicarbonate
c.bicarbide
d.dicarbide
4) how many nonbonding electrons are present in a molecule of water?
a.2
b.4
c.6
d.8
5) the generation of the electrical potential needed for neurotransmission requires that
which of the following has a low concentration in cerebral tissue?
a.clc.na+
b.k+d.o2
6) what are the elements in the a columns of the period table called?
a.main group elements
b.inner transition elements
c.metalloids
d.transition elements
7) under which of the following conditions is the ab bond considered to be ionic?
a.when a and b have the same electronegativity
b.when the difference between the electronegativities of the atoms is 1.0
c.when the difference between the electronegativities of the atoms is 1.5
d.when the difference between the electronegativities of the atoms is 2.0
8) which of the following correctly describes an electron?
a.on the scale of subatomic particles it is massive and has a +1 charge
b.on the scale of subatomic particles it is massive and has a 1 charge
c.on the scale of subatomic particles it is light and has a +1 charge
d.on the scale of subatomic particles it is light and has a 1 charge
9) which of the following levels of psa in serum is the smallest which might indicate the
possible development of prostate cancer?
a.2 ng/mlc.8 ng/ml
b.4 ng/mld.12 ng/ml
10) normal urine has a ph in which of the following ranges?
a.1.5 to 3.5c.5.5 to 7.5
b.3.5 to 5.5d.7.5 to 9.5
11) for which of the following pairs are the atoms most likely to form an ionic bond
with each other?
a.carbon and oxygen
b.calcium and chlorine
c.chlorine and oxygen
d.sodium and magnesium
12) in the regions of the periodic table associated with the main group elements which
type of orbitals are being filled?
a.s only
b.p only
c.s or p
d.d only
13) how many elements are there in period 4?
a.2
b.6
c.8
d.18
14) the toxic gas hydrogen cyanide has the formula hcn. which of the following is a
correct description of hydrogen cyanide?
a.hcn has only single bonds.
b.hcn has one single bond and one double bond.
c.hcn has one single bond and one triple bond.
d.none of these is correct.
15) if you could line up the nuclei of lead-208, approximately how many nuclei would
you need to line up in order for them to form a line 1 inch long?
a.82
b.208
c.8.2 x 107
d.1.6 x 1012
16) which of the following have been associated with prolonged treatment with drugs
such as premarin or provera?
a.an increased risk of breast cancerc.both a and b
b.an increased risk of uterine cancerd.neither a nor b
17) how many different nervous system control systems begin to function when a
patient begins to hemorrhage?
a.1c.3
b.2d.4
18) consider the periodic table given below.
which number represents the element with the largest atomic weight?
a.1
b.2
c.3
d.4
e.5
f.6
g.7
19) the ionization energy of an atom is which of the following?
a.the energy released when an atom gains an electron
b.the energy released when an atom loses an electron
c.the energy required to add an electron to an atom
d.the energy required to remove an electron from an atom
20) which of the following is true of red blood cells?
a.they circulate in the blood for about 1 month.
b.they are called leukocytes.
c.they have dna.
d.none of these is true.