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FRESHMEN
Lead(II) chromate is used as a yellow pigment to designate traffic lanes, but has been banned
from house paint because of the potential for lead poisoning. The compound from chromite
(FeCr2O4), an ore of chromium:
FeCr2O4 (s) + K2CO3 (aq) + O2 (g)  Fe2O3 (s) + K2CrO4 (aq) + CO2 (g)
Lead(II) ion then replaces the K+ ion. If a yellow paint is 0.511% PbCrO4 by mass, how many
grams of chromite are needed per kilogram of paint?
SOPHOMORES
Explain ring flipping
JUNIORS
The emf of the cell Ag | AgI(s) | AgI(aq) | Ag is +0.9509 V at 25°e. Calculate (a) the solubility
product of AgI and (b) its solubility.
SENIORS
Proteins or peptides are polymers formed from the condensation reactions of amino acids, which
have the general structure
QuickT i me™ and a
decom pressor
are needed t o see thi s pi cture.
In this structure, R represents side groups that identify an amino acid. Draw the peptide segment
that has the amino acid sequence A-C-H-E-S.
BONUS
Ash Ketchum (Satoshi ) is a boy who came from Pallete Town. He left his beloved hometown
with his adorable, yellow, lightning-shape-tailed gigantic mouse named Pikachu in order to
become the world's greatest Pokemon master. So, what is the compound that gives a certain
spice, which is also a city in this Pokemon world, its yellow color?
(Name the spice and the compound.)