1) how many bonds does a carbon atom typically form?
a.2
b.4
c.6
d.8
2) what bond angle is most closely associated with a tetrahedral distribution of electron
density?
a.90o
b.109.5o
c.120o
d.180o
3) which of the following cannot readily cross the blood-brain barrier?
a.cl-
b.k+
c.na+
d.all of these
4) formaldehyde has the chemical formula ch2o. how many electrons must be shown in
the lewis structure of formaldehyde?
a.4
b.8
c.12
d.16
5) which of the following statements describe properties of orbitals?
a.orbitals fill in the order of increasing energy from lowest to highest.
b.each orbital can hold up to two electrons with opposite spins.
c.when there is a set of orbitals of equal energy each orbital becomes half filled before
any of them becomes completely filled.
d.all of the above
6) which of the following is the correct way to write the formula of the compound
formed between the calcium ion and the sulfate ion?
a.ca2(so4)2
b.ca2so4
c.ca(so4)2
d.caso4
7) which of the following is true about a molecule which contains three polar bonds
each of which have the same degree of polarity?
a.the molecule will always be polar.
b.the molecule will never be polar.
c.the molecule will be polar if the electron distribution is tetrahedral.
d.none of the above is true.
8) approximately what volume of urine does a normal person excrete each day?
a.15 mlc.1,500 ml
b.150 mld.15,000 ml
9) atoms of which of the following elements are smallest?
a.al
b.mg
c.na
d.none, they are all the same size.
10) which of the following is the stannous ion?
a.sn+
b.sn2+
c.sn3+
d.sn4+
11) which of the following is true of the individual resonance structures which
contribute to a resonance hybrid?
a.each resonance structure actually exists.
b.each resonance structure is more stable than is the resonance hybrid.
c.in going from one resonance structure to another the electrons move from one
location to another.
d.none of the above is true.