AS - Redox Reactions Flashcards
What is oxidation?
The process of electron loss.
What is reduction?
The process of electron gain.
What is an oxidising agent?
An electron acceptor.
What is a reducing agent?
An electron donor.
What does the oxidation state/number of an element tell you?
The total number of electrons the element has donated or accepted.
For example, if the element has donated one electron, it’s OS is +1, and if it has accepted one electron, its OS is -1.
What are the oxidation states of uncombined elements?
0
What are the oxidation states of elements only bonded to identical atoms, e.g O2 or H2?
0
What are the oxidation states of simple monatomic ions, like Na+?
It’s the same as it’s charge. So +1 for Na+.
What is the overall oxidation state for a compound ion?
The same as the charge on the compound ion.
What is the overall oxidation state for a neutral compound?
0
What is the oxidation state for combined oxygen most of the time? What are the exceptions to this rule?
Nearly always -2.
Except in peroxides, it’s -1, in fluorides, it’s +2, in O2F2, its +1 and in O2, it’s 0.
What is the oxidation state for combined hydrogen most of the time? What are the exceptions to this rule?
Mostly +1.
In metal hydrides, it’s -1, in H2, it’s 0, in HF, it’s +1 and in NaH, it’s -1.
What do Roman numerals in a chemical name indicate? Give an example.
Oxidation state.
In iron(II) sulfate, iron’s OS is +2.
