Summary: Chem 13H Exam #1
Note that more points are awarded for your explanations than for the correct answer.
Closed book exam. No calculators are required (or allowed!). A periodic table is supplied; you may
not use your own.
1) Choose two alkali atoms (from Li, Na, K, Rb, Cs).
a) Explain the relative reactivity of these elements with water.
b) For one of these elements, write the reactions that take place.
Al. Describe what materials/molecules you will use and in what form.
3) Energies ---- for (a--c) use the same energy units (presumably your favorite)
a) What is the energy (or range) of a visible photon?
b) What is the energy of a typical covalent bond?
c) What is the energy of an X--ray photon used for determining crystal structures via diffraction
(hint-- by what factor is this different than a visible photon)?
d)Convertthevisiblephotonenergyyougaveaboveintothreeofthe following(that arenot thesame
as you used above): cm--1, eV, Hz, J, kcal/mole, kJ/mole