1) carbonic anhydrase is involved in which of the following?
a.binding co2 to hemoglobinc.both a and b
b.converting co2 to carbonic acidd.neither a nor b
2) examine the following image representing the structure of a compound.
if the larger sphere represented s2-, the smaller sphere might represent which of the
following?
a.k+
b.o2-
c.mg2+
d.al3+
3) which is true of isotopes of an element?
a.they have different numbers of electrons.
b.they have different numbers of neutrons.
c.they have different numbers of protons.
d.they have different chemical properties.
4) which of the following is true about a molecule which contains two polar bonds
which have the different degrees of polarity?
a.it will always be polar.
b.it will never be polar.
c.it will only be polar if it is bent.
d.it will only be polar if it is linear.
5) atoms of which of the following elements are smallest?
a.cl
b.p
c.s
d.none, they are all the same size.
6) which of the following is secreted by the kidneys?
a.angiotensinc.renin
b.angiotensinogend.none of these
7) the mass of a proton is approximately which of the following?
a.12 g
b.1 g
c.12 amu
d.1 amu
8) which of the following has the highest ionization energy?
a.br
b.cl
c.f
d.i
9) electrons can sometimes fill orbitals in a manner other than according to the rules we
have specified. if they do so we say the atom is in an excited state. which of the
following represent(s) the excited state of an atom?
a.1s22s22p63s2
b.1s22s22p63s13p1
c.both a and b
d.neither a nor b
10) consider the periodic table given below.
which number represents an element classified as an alkali metal?
a.1
b.2
c.3
d.4
e.5
f.6
g.7
h.none of these
11) what are the horizontal rows of the periodic table called?
a.cycles
b.periods
c.families
d.none of these
12) the ammonium ion has the formula nh4+. how many electrons must be shown in the
lewis structure of the ammonium ion?
a.4
b.5
c.8
d.9
13) if you could line up atoms of lead-208, approximately how many atoms 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
14) the tin compound used to strengthen teeth has the formula snf2. which of the
following is the correct systematic name for this compound?
a.stannic fluoride
b.stannous fluoride
c.tin fluoride
d.tin(ii) fluoride
15) what is the name of no2?
a.nitrogen oxide
b.nitrogen oxygen
c.nitrogen dioxide
d.nitrous oxide
16) the blood-brain barrier is permeable to which of the following species?
a.cl
b.some antihistamines
c.na+
d.none of these
17) what is the correct formula for sodium fluoride?
a.nafi2
b.naf
c.na2f
d.na2f2
18) which of the following is associated with a high leukocyte count?
a.anemiac.leukemia
b.polycythemiad.typhoid
19) ethylene has the formula c2h4. which of the following is a correct description of
ethylene?
a.ethylene has only single bonds.
b.ethylene has one double bond.
c.ethylene has one triple bond.
d.none of these is correct.