AS - Redox Reactions Flashcards
(13 cards)
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.
