Shared Flashcard Set

Details

Group 6B: O, S, and Se
part of speciation and general behavior
21
Chemistry
Undergraduate 4
01/10/2017

Additional Chemistry Flashcards

 


 

Cards

Term
O is found in soil predominantly in this valence state
Definition
O-II
Term
the role of O in the O0 valence state
Definition
it is an important electron acceptor, serving as an oxidant in redox rxns
Term
an important and helpful rule of thumb for redox rxns
Definition
1 electron will be consumed by 1/4 O2 when O2 is the oxidant
Term
when inorganic S occurs in the -II oxidation state
Definition
in highly reduced soil systems (anoxic)
Term
when S occurs in the VI oxidation state
Definition
in systems other than highly reducing environments
Term
where 95-99% of the total soil S is found
Definition
soil organic matter
Term
where S can occur in both the -II and VI oxidation states
Definition
organic matter
Term
the behavior of inorganic S in soil is generally controlled by...
Definition
the interactions of the SO42- ion
Term
the importance of sulfate in soil solution
Definition
-it's an important ligand in soil solutions, forming stable, soluble complexes with a host of metal cations
-generally an exchangeable anion and a significant component of the anion exchange
Term
when sulfate may participate in ligand exchange rxns
Definition
under strongly acidic conditions
Term
oxidation states in which Se can occur
Definition
--II
-0
-IV
-VI
Term
Se species that are stable in the presence of O2
Definition
-selenite (HSeO3- and SeO32-) -selenate (SeO42-)
Term
the species of Se that are stable in highly reduced (anoxic) environments
Definition
-elemental Se -selenide (H2Se and HSe-)
Term
the species of Se that tends to dominate in acidic systems
Definition
selenite (HSeO3- and SeO32-)
Term
the species of Se that tends to dominate in alkaline systems
Definition
selenate (SeO42-)
Term
speciation of Se in soil is similar to that of...
Definition
S
Term
the Se content of soil is generally dictated by...
Definition
the parent rock type
Term
Se species that form stable, soluble complexes with a host of metal cations
Definition
-selenide
-selenite
-selenate
Term
mobility of S in soil
Definition
mobile
Term
mobility of Se in soil
Definition
mobile
Term
does Se form mineral precipitates in soil?
Definition
generally doesn't
Supporting users have an ad free experience!