Chapter 3 Flashcards
(26 cards)
What do oxidation numbers tell you about?
How many electrons an atom has donated or accepted to form an ion
What is the oxidation number of all uncombined elements?
0
What is the oxidation number of all elements that are bonded to identical elements?
0
What is the oxidation number of hydrogen in H2?
0
What is the oxidation number of a simple, monatomic ion?
The same as its charge
For molecular ions, what is the sum of the oxidation numbers equal to#?
The overall charge of the ion
For a neutral compound, what is the overall charge?
0
So, for a neutral compound what is the sum of the oxidation numbers?
0
When is the only time that hydrogen doesn’t have an oxidation number of +1?
In metal hydrides
When is the only occasion that oxygen doesn’t have an oxidation number of -2?
In peroxides (O2)2-
What do roman numerals tell you?
The oxidation number of the elements
In copper(I) oxide, what is the oxidation number of copper?
+1
What is the formula of copper (I) oxide?
Cu2O
What do ions ending in ‘ate’ contain?
Oxygen and another elements
What is the formula of a nitrate ion?
NO3-
What is the oxidation number of H in H2?
0
What is the usual oxidation number of oxygen when its combined with another elements?
-2
What is a redox reaction?
When electrons are transferred in a reaction
What is oxidation?
A loss of electrons
What is reduction
A gain in electrons
What is an oxidising agent?
An element that accepts electrons and gets reduced
What is a reducing agent?
An element that donates electrons and gets oxidised
What is a disproportionation reaction?
A special redox reaction, where an element in a single species is simultaneously oxidised and reduced
What can ionic half equations show?
Oxidation and reduction
