Oxidation Numbers Flashcards
What does the oxidation number give?
The oxidation state of an element or ionic substance
In metal hydrides, what is the oxidation number of hydrogen?
-1
In peroxides, what is the oxidation number of oxygen?
-1
What do Roman numerals indicate?
The magnitude of an oxidation number
What does oxidation involve?
The loss of electrons - results the oxidation number becoming more positive
What does reduction involve?
Gain of electrons - results in the oxidation number becoming more negative
Why do oxidation and reduction occur simultaneously in a reaction?
One species loses electrons which are donated and gained by the other species
What does an oxidising agent do?
Accepts electrons from an element that is being oxidised
What does a reducing agent do?
Donates electrons to the species being reduced
What happens in a disproportionation reaction?
When a species is both oxidised and reduced
What is an example of a disproportionation reaction?
Cl2 + H2O —> ClO- + Cl- + 2H+
What is a MASH reaction?
Metals react with acids to form salt and hydrogen
