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Exam Chem 210 Module 2 Newest
1.What is the shape of water?: Bent. The bond angle is 104.5 degrees.
2.What is autoionization, and how is it important for water?: Autoionization is the ability
of a compound to react with itself to form ions. One water molecule reacts with a second
molecule to form two ions: H3O+ and OH-. These ions exist in small amounts in pure water and
influence the chemistry of water.
3.Name the three non-covalent forces discussed in this module.: 1. Dipole-di- pole
forces, 2. Hydrogen bonding, and 3. London dispersion forces
4.What type of non-covalent interaction is known as the strongest dipole-di- pole
force?: hydrogen bonds
5.How does the strength of London forces change with increasing molecular weight?
Explain briefly.: As molecular weight increase, the strength of London forces also increase.
This is due to the increased number of electrons in larger mol- ecules. The larger number of
electrons creates the potential of stronger temporary dipoles.
6.What is the concentration, in M, of water as a pure liquid?: 55.5 M
7.Define Keq and Kw.: Keq is the equilibrium constant. Numerically, it is equal to the
concentrations of equilibrium products (in M) multiplied together over the concentration of
equilibrium reactants multiplied together.
Kw is called the ion product. It is, essentially, the Keq for water that is equal to 1.0 x 10-14; the
formula is:
