Redox Flashcards
What is oxidation?
in terms of oxygen, electrons and hydrogen
The gain of oxygen
The loss of electrons
The loss of hydrogen
What is reduction?
in terms of oxygen, electrons and hydrogen
The loss of oxygen
The gain of electrons
The gain of hydrogen
What is the oxidation state of an uncombined element?
Zero
What is the sum of the oxidation states of all atoms or ions in a neutral compound?
Zero
Which is given the negative oxidation state? The more electronegative element, or the less electronegative element?
The more electronegative element.
What is the oxidation state of group 1 metals?
+1
What is the oxidation state of group 2 metals?
+2
What is the oxidation state of oxygen? Exceptions?
-2 (except in peroxides and F2O)
What is the oxidation state of hydrogen? Exceptions?
+1 (except in metal hydrides where it is -1)
What is the oxidation state of fluorine?
-1
What is the oxidation state of chlorine?
-1 (except in compounds with O or F)
What is a disproportionation reaction?
A species is both oxidised and reduced.
What is the step by step process for writing out half equations?
1) Balance all species (ignore oxygen hydrogen)
2) Balance oxygen using H2O
3) Balance hydrogen using H+ ions
4) Balance charges using electrons (e-)
How can half equations be combined?
Ensure the number of electrons are the same for both half equations. Multiply equation (like simultaneous equations).
