Quiz 3 Material

[Robert Zellmer]

Quiz 3 will cover:  Sections 13.1, 13.3, 13.5-13.6

Section 13.1:

Understand the solution process and energy diagrams, how solutions form,
ideal, endothermic and exothermic solution formation and the importance
of entropy in solution formation.  In general, when things mix there is
an inc. in entropy (disorder) but this is not always the case.  An inc.
in entropy is absolutely necessary for an ideal or endothermic solution
to form.  This is not the case for an exothermic process.  An exothermic
process already tends to be spont. so an inc. in entropy is not necessary
for this type of solution to form.  There are cases in which the delta(H)soln
is negative, exothermic, and the entropy decreases (solution is more ordered)
and the solution forms.  Also, understand the role of attractive forces
between particles in solution formation.

In the 12th edition the delta(H)_solvation is referred to as the
the delta(H)_mix.

I also have a link showing the solution enthalpy diagrams including a
discussion about the attractive forces and entropy, "Ch. 13 - Solution
Formation and Solubility Effects" in the "Notes" section of the course web
page.

http://chemistry.osu.edu/~rzellmer/chem1220/notes/ch13_soln_formation.pdf


Section 13.3:

Factors affecting solubility - Att. forces ("like dissolves like"), pressure
and temp. affects. You're considering temp. effects and "like dissolves like"
concepts in exp 15.

I have summary on line about attractive forces and solubility. See the link
"Ch. 11 & 13 - Review of IAF, Solids and Solubility" in the "notes" section of
the course web page.

http://chemistry.osu.edu/~rzellmer/chem1220/notes/ch11_12_13_rev.htm


Sections 13.5-13.6:

Make sure you can do colligative property calculations, including
for ionic substances or ionizing molecular substances (things that
dissociate or ionize to give multiple particles, NaCl, HCl, etc.).
Know what the van't Hoff factor is (effective # particles or
observed "i" - see "A Closer Look" on page 540, 12th ed.,
554, 11th ed., page 557, 10th ed. and my notes).  Look at the
link I have about colligative properties under the "Helpful Tidbits"
link,

http://chemistry.osu.edu/~rzellmer/chem1220/faq/collig_prop.txt

which was e-mailed earlier.

You should understand how osmosis effects cells.

Finally, you should understand what colloids are and how you tell
whether you have a colloid or a solution (Tyndall effect).  Also, you
should know the difference between hydrophilic and hydrophobic colloids.

You should review section 2.7-2.8 on ions,
their charges and polyatomic ions, which stay together as a
single unit when an ionic compound dissolves.  Also, review sections
4.1-4.3 which deal with electrolytes and nonelectrolytes in solution
and acid/base reactions.  Look at tables 4.2 and 4.3 in relation to
strong and weak acids and bases.

You should be able do to homework problems 13.1-13.4, 13.6-13.8,
13.10-13.22, 13.27-13.38, 13.61-13.90, 13.91, 13.93-13.94, 13.99-13.112

For those of you using the 11th edition do homework problems 13.1-13.4,
13.6-13.8, 13.10-13.20, 13.25-13.34, 13.57-13.86, 13.87, 13.89-13.90,
13.94-13.112

For those of you using the 10th edition do homework problems 13.1-13.3,
13.5-13.6, 13.8-13.18, 13.23-13.32, 13.55-13.82, 13.83, 13.85-13.86,
13.92-13.108


Dr. Zellmer