redox reactions

Question 1

define oxidation

Answer 1

loss of electrons

Question 2

define reduction

Answer 2

gain of electrons

Question 3

what is a reducing agent

Answer 3

donates electrons to the species being reduced
therefore, loses electrons and is oxidised (increase in oxidation number for the reducing agent)

Question 4

what do oxidation & reduction result in?

Answer 4

oxidation= oxidation number becomes more positive
reduction= oxidation number becomes more negative

Question 5

what is an oxidising agent?

Answer 5

accepts electrons from the species being oxidised
- therefore, gains electrons + is reduced (reduction in oxidiation number)

Question 6

what happens in a disproportionation reaction?

Answer 6

a species is both oxidised and reduced, seen as both an increase and decrease in oxidation number for that species
eg. Cl2 + H2O —> ClO- + Cl- + 2H+

Question 7

metals + acids —> ?

Answer 7

salt + hydrogen (MASH)