2.1.5 Redox Flashcards
What is oxidation?
The loss of electrons or hydrogen and the gain of oxygen
What is reduction?
The gain of electrons or hydrogen and the loss of oxygen
What are the oxidisation states of Na2SO4?
O-2
Na+1
S+6
What is the exception for hydrogen?
Minus one in hydrides(compounds containing a metal)
What is the exception to chlorine?
When bonded to Fluorine or oxygen, -1 value changes
What is the exception to oxygen?
-1 in hydrogen peroxide H2O2
Takes other values when bonded to fluorine
Oxidising agents are
Electron acceptors
Reducing agents are
Electron donors
Pure elements have an oxidation number of
02 or Cl2 or C
0
Write redox equations for Cu + 1/2O2 —> CuO
Cu —> Cu2+ + 2e-
1/2O2 + 2e- —> O-2
write the redox reaction Al + 1.5Cl2 —> AlCl3
Al —> Al+3 + 3e-
1.5Cl + 3e- —> 3Cl-3
Write the redox reaction and ionic equation
CuO + Mg —> MgO + Cu
C2+ + 2e- —> Cu
Mg —> Mg+2 + 2e-
Cu2+ Mg —> Cu + Mg+2
O is a spectator ion
What is an oxidation number?
The number of electrons an atom uses to bond with any other atom
What is a redox reaction?
A reaction in which both oxidation and reduction takes place
Eg CuO + Mg —> MgO + Cu
H2S + Cl2 —> 2HCl + S
What happened here?
The sulphur is oxidised
A phosphate ion PO4 has and -3 charge what is the formula for copper phosphate?
Cu3PO4
