CHM109 Week 4 Exercises

University of Phoenix Material

Week 4 Exercises

Preparewritten answers to the
following exercises:

1.
Imagine that you are an environmental scientist. Working in
collaboration with a university chemist, you were able to determine from mass
spectrometry that four elements exist in your soil samples. They are Se, Sn,
Pb, and Cd.

You need to determine
which elements will most likely combine with oxygen to produce oxides that are
present in your sample. To do so, refer to the periodic table to determine the
electron configuration and ionization energy of each element. This will show
the number of valence electrons for each element.

·
What are the electron
configurations for Se, Sn, Pb, and Cd?
·
What are the valence electrons
for Se, Sn, Pb, and Cd?
·
Rank the elements in
increasing ionization energy.
·
Which element will form
oxides?

2.
Imagine that, as an employee of a pharmaceutical company, you are
working on an H-K-ATPase. It is the enzyme that pumps acid into the stomach to
help in digestion. You are trying to determine whether a compound will fit
inside the pocket of this enzyme in order to inhibit the enzyme. To do so, you
must know the molecular shape of the compound.

Draw
the Lewis structure and determine the molecular geometry of the following
compounds that may fit into the active site of this enzyme:

·
CO2
·
KOH
·
NO3
·
HCN

3.
Imagine that you work as a chemist in a battery manufacturing plant. You
are asked to try a variety of substances that can be used to generate an ion
potential necessary to produce electricity. Ionic compounds produce ions that
can generate an ion potential when placed in an aqueous solution.

Name the various
compounds in the following table and label them as ionic or molecular:

Formula

Name

Ionic or molecular

PtO2

CF2Cl2

CO

KClO3

CoSO4

CO2

SO3

Ba(NO3)2

NH4I

NaClO4

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