1) although atoms are the smallest unit of an element, relatively few elements can be
found in nature as individual atoms. which of the following elements can be found as
individual atoms?
a.hydrogen
b.iron
c.krypton
d.sulfur
2) in the “ous/ic” system which species is named with the “ic” ending?
a.the less negative anion
b.the more negative anion
c.the less positive cation
d.the more positive cation
3) what is the correct name for nh4no3, a compound found in fertilizers?
a.ammonia nitrate
b.ammonium nitrate
c.ammonia nitrite
d.ammonium nitrite
4) which of the following enzymes promotes the conversion of testosterone to
5–dihydrotestosterone?
a.5–oxidasec.testosterone isomerase
b.5–reductased.testerase
5) how many main types of chemical bonds exist?
a.1
b.2
c.3
d.4
6) atoms of which of the following elements are smallest?
a.ca
b.k
c.mg
d.na
7) which of the following elements is most electronegative?
a.b
b.c
c.n
d.o
8) the blood-brain barrier is permeable to which of the following species?
a.oxygen
b.carbon dioxide
c.glucose
d.all of these
9) low electronegativities are associated with which type of elements?
a.metals
b.metalloids
c.noble gases
d.nonmetals
10) a student discussing bond polarity and molecular polarity in alcohols made the
following statements:
(i) in methanol, ch3oh the h-o bond is more polar than the c-o bond.
(ii) ethanol, ch3ch2oh, the alcohol of alcoholic beverages, has at least one polar bond, a
net dipole, and is a polar molecule.
which of the above statements is(are) true?
a.only statement (i)
b.only statement (ii)
c.both statement (i) and statement (ii)
d.neither statement (i) nor statement (ii)
11) which of the following columns of the periodic table contains only gaseous
elements?
a.5a
b.6a
c.7a
d.8a
12) which of the following ions has the same electronic configuration as argon?
a.k+
b.ca2+
c.both a and b
d.neither a nor b
13) what is the correct name for kcl?
a.monopotassium monochloride
b.potassium chlorine
c.potassium chloride
d.potassium ion chloride ion
14) which of the following is generally true of all anions?
a.an anion has equal numbers of protons and electrons.
b.an anion has fewer protons than electrons.
c.an anion has more protons than electrons.
d.an anion has more electrons than neutrons.
15) which of the following describes how a double bond is treated in the vsepr model?
a.as two single bonds
b.as two nonbonding pairs
c.as a single region of electron density
d.none of the these
16) which of the following is true about elements in the same horizontal row of the
periodic table?
a.the number of valence electrons remains the same throughout the row.
b.the number of valence electrons decreases as we move left to right across a row.
c.the number of valence electrons increases as we move left to right across a row.
d.there is no simple relationship between the number of valence electrons and the
position of the element.
17) the chemical formula of rust is fe2o3. which of the following is the correct
systematic name for this compound?
a.iron oxide
b.iron(ii) oxide
c.iron(iii) oxide
d.diiron trioxide
18) which of the following is true about elements which exist as diatomic molecules?
a.the bond in the molecule is nonpolar covalent.
b.the bond in the molecule is polar covalent.
c.the bond in the molecule is ionic.
d.the type of bond depends on the specific molecule.
19) examine the following image representing the structure of a compound.
which of the following is a possible formula for the compound represented in the
image?
a.kbr
b.hcl
c.no
d.icl
e.cacl2
f.more than one of these
20) which of the following symbols is used to denote that two or more representations
of a species are resonance structures?
a.→
b.←
c.
d.↔