Flashcards in Redox Deck (15)
What is the oxidation number of any element?
What is the oxidation number of an ion?
The same as the charge of the ion
(Cl- = -1)
What does the sum of the oxidation numbers in a molecule have to equal?
What is Fluorine's oxidation number?
What is Oxygen's oxidation number?
-1 (in peroxide)
+2 (combined with fluorine)
What is Hydrogen's oxidation number?
+1 (apart from in metal hydrides)
Are metals positive or negative?
What is reduction?
When the oxidation number of an element decreases
What is oxidation?
When the oxidation number of an element increases
What are half equations?
An equation split into 2, showing which elements are oxidised and which are reduced?
Split this equation into 2 half equations
Zn(s) + 2Ag+(aq) -> Zn^2+(aq) + 2Ag(s)
Zn(s) -> Zn^2+ + 2e-
2Ag+(aq) + 2e- -> 2Ag(s)
What is Chlorine's oxidation number?
-1 (almost always)
What do you call the ion that has an oxidation number that doesn't change?
What is a redox reaction?
One where oxidation and reduction occurs