Oxidation Number
The sum of oxidation numbers in a compound.
Zero
The oxidation number of Ca.
Zero
Defined as the loss of electrons.
Oxidation
Which atom got oxidized and which atom got reduced?
2Na + Cl2 = 2NaCl
Na was oxidized (0 to +1) while Cl was reduced (0 to -1)?
Oxidation occurs at this electrode.
The oxidation state of a group 1 element
+1
The oxidation number of oxygen in H2O2
-1
Defined as the gain of electrons.
Reduction
Which atom got oxidized and which atom got reduced?
KClO3 ---> KCl + O2
O gets oxidized (-2 to 0) while Cl gets reduced (+5 to -1)?
Classification of Reaction for
2Al + 6HCl --> 2AlCl3 + 3H2
What is Single Displacement Reaction?
The oxidation state of Br in Br2
0
Oxygen will have a positive oxidation state when combined with this element.
Fluorine
The substance that is oxidized in a redox reaction is known as this Agent.
Reducing Agent
Which atom got oxidized and which atom got reduced?
Zn + CuCl2 = ZnCl2 + Cu
What are Zn gets oxidized (0 to +2) while Cu gets reduced (+2 to 0)
Reduction occurs at this electrode.
Cathode
The oxidation state of H in CaH2
-1
The oxidation number of nitrogen in NaNO2
+3
The change in oxidation number from 0 to -2 represents this type of redox change.
Reduction
Which atom got oxidized and which atom got reduced?
CH4 + O2 = CO2 + H2O
What are C gets oxidized (-4 to +4) while O gets reduced (0 to -2)?
Classification of reaction for
FeS + 2HBr -->FeBr2 + H2S
What is Double Displacement Reaction?
*This is the only category of reactions in which neither oxidation nor reduction occurs
The oxidation state of sulfur in Na2S2O3
+2
The oxidation state of carbon in NaHCO3
+4
Fe + 2AgCl → 2Ag + FeCl2
In the redox reaction above which species is oxidized.
Fe
Which atom got oxidized and which atom got reduced?
H2O2 = H2O + O2
What is oxygen is being oxidized and reduced at the same time?
*1 O from hydrogen peroxide got oxidized (-1 to 0) while 1 O from hydrogen peroxide got reduced (0 to -2); H remains having an oxidation number of +1
Classification of reaction for 2HgO = 2Hg + O2
What is Decomposition Reaction?