3.1.7 - Redox

Question 1

What is special about transition metal oxidation states?

Answer 1

They are variable, e.g iron can exist as Fe(II) as well as Fe(III)

Question 2

Balancing half equations

Answer 2

• Balance elements by adding that specific element, not a compound
• Balance oxygen’s by adding H2O
• Balance hydrogen’s by adding H+ ions
• Balance positive charges by adding electrons

Question 3

Oxidising agent

Answer 3

A reagent that oxidises (takes electrons from) another species, it itself is reduced.

Question 4

Combing half equations

Answer 4

Multiply first equation by number to get electron number equal
Add both equations together, remove the electron thingy’s.

Question 5

Oxygen oxidation number

Answer 5

-2 except peroxide -1