Redox Flashcards
What occurs in redox reactions?
One element is reduced and another element is oxidised.
Define redox.
Oxidation and reduction occurring at the same time.
What is oxidation?
The loss of electrons.
What is reduction?
The gain of electrons.
What does OILRIG stand for?
Oxidation Is Loss, Reduction Is Gain.
What is the oxidation state of elements in their elemental form?
Zero.
What is the oxidation state of hydrogen in compounds?
+1 (except in hydrides).
What is the oxidation state of oxygen in compounds?
-2 (except in peroxides and F2O).
What is the oxidation state of oxygen in peroxides like H2O2?
-1.
What is the oxidation state of oxygen in F2O?
+2.
What is the oxidation state of Group 1 elements in compounds?
+1.
What is the oxidation state of Group 2 elements in compounds?
+2.
What is the oxidation state of Group 6 elements in compounds?
-2.
What is the oxidation state of Group 7 elements in compounds?
-1.
In a neutral compound, what do the oxidation states add up to?
0.
In an ion, what do the oxidation states add up to?
The charge on the ion.
What is the oxidation number of hydrogen in hydrides?
-1
What occurs in a disproportionation reaction?
A species is simultaneously oxidised and reduced
