topic 3 - redox Flashcards
what’s an oxidation number
how many electrons an atom has donated or accepted to form an ion or to form part of a compound
what’s the oxidation number of a simple monatomic ion
the charge of the ion
what’s the oxidation number of combined oxygen
-2 ( except in O2 and peroxides )
what’s the oxidation number of chlorine
-1
what’s the oxidation number of hydrogen
+1 ( except in metal hydrides it’s -1 )
what’s the oxidation number of oxygen
-2 ( except in peroxides it’s -1 )
what’s an ion that ends with ‘ate’
contains oxygen and another element. the roman numeral corresponds to the non-oxygen element in the -ate ion
what is a loss of electrons called
oxidation
what is a gain of electrons called
reduction
what is a redox reaction
reduction and oxidation happening simultaneously
what is an oxidizing agent
it accepts electrons and gets reduced itself
what is a reducing agent
it donates electrons and oxidizes itself
what does it mean if an element has been oxidized
- oxidation number increased
- element lost electrons
- element has been oxidized
what does it mean if an element has been reduced
- oxidation number decreases
- element gained electrons
- element has been reduced
