redox reactions
definition of oxidisation
if a substance loses electrons it is oxidised in a reaction
definition of reduction
if electroms are gained in a reaction it has been reduced this is a redox reaction
how to write a half equation
-write each reactant eith electrons it gains or loses -check each substance is in correct form -number of electrons should be the same in both
what is a redox reaction
any reaction with electron transfer is a redox reaction
rules of oxidation
-each atom in the formula has an oxidation number -the oxidation number of an uncombined element is 0 -oxidation number of a simple (monoatomic) ion is the same as its charge -most transition elements have different oxidation number in their compounds
oxidising agent
oxidises reducing agent and gets reduced itself
reducing agent
reduced oxidising agent and oxidises itself
example of oxidising agent
potassium magnate
example of reducing agent
potassium iodide