2.1.5 -Redox
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What is an oxidation number?
The number of electrons an atom uses to bond with any other atom.
What is the oxidation number of an uncombined element such as C, H or O2?
0
What is the oxidation number of combined oxygen such as in H2O?
-2
What is the oxidation number of oxygen in peroxides?
-1
What is the oxidation number of combined hydrogen such as in NH3, or H2S?
+1
What is the oxidation number of combined hydrogen in metal hydride such as LiH?
-1
What is the oxidation number of a simple ion?
The charge of the ion
What is the oxidation number of combined flourine such as in NaF, or CaF2?
-1
When an element has more than one stable oxidation number, how is it indicated?
As a Roman numeral
What is the oxidation number of Fe in iron (III) chloride?
+3
What are oxyanions?
Negative ions that have an element along with oxygen.
What is the oxidation number of S in SO42-?
+6
Define oxidation in terms of electron transfer and oxidation number.
Oxidation is • Loss of electrons • an increase in oxidation number
Define reduction in terms of electron transfer and oxidation number.
Reduction is • Gain of electrons • A decrease in oxidation number
What is a redox reaction?
A reaction in which both oxidation and reduction takes place.
What is the oxidation number of a single metal atom?
0