(oxygen) what is oxidation
Gain of OXYGEN by a substance
(oxygen) what is reduction
LOSS of OXYGEN by a substance
What’s an oxidizing agent
Substance that OXIDISES another substance while being REDUCED
What is a reducing agent
Substance that REDUCES another substance while being OXIDISED itself
structure for “ which is the reducing agent” (OXYGEN)
Eg CuO + C –> Cu + CO
C is the REDUCING AGENT becuz C gains oxygen from CuO and REDUCES CuO to Cu
Structure for which substance is reduced (oxygen)
Eg CuO + C –> Cu + CO
CuO is REDUCED becuz CuO LOSES OXYGEN to form Cu
(hydrogen) what’s oxidation
Loss of HYDROGEN by a substance
(HYDROGEN) what is reduction
GAIN of HYDROGEN by a substance
Definition of redox reaction
Its a reaction where oxidation n reduction happening at same time
Examples of redox reaction irl
Photosynthesis
Respiration
Decay of food
Bleaching action
Electrolytic reactions
Combustion of fuels
Corrosion of metals
Structure of “ what is the reducing agent” (HYDROGEN)
Cl2 + H2S2 —> 2HCL + S
H2S is the REDUCING AGENT becuz H2S LOSES HYDROGEN TO CL2 and REDUCES CL2 TO HCL
(ELECTRONS) what is oxidation
LOSS OF ELECTRONS by a substance
( ELECTRONS) what is reduction
GAIN of ELECTRONS by a subtsance
Is this eqn OXIDISED or reduced
(Na —> Na+ + e-)
oxidised cuz Na loses electrons to form Na+
Is this eqn OXIDISED or reduced
( Cl2 + 2e- —-> 2Cl-)
Reduced cuz Cl2 gains electrons to form Cl-
Structure of “ what is the reducing agent” (ELECTRONS)
Na –> Na+ + e-
Na is the REDUCING AGENT becuz Na LOSES ELECTRONS TO CL2 and REDUCED CL2 to CL-
What are half equations
Equations showing which substance gains electrons n which substances loses electrons
What is oxidation state / number
Charge that an atom of an element wld have if it existed as an ion
Eg Na+ oxidation state is +1
What is the oxidation state of elemental substance ( not combined w other elements) (rule 1)
0
How to write the oxidation state of element ( rule 2)
Charge of the ion but the sign is b4 the number
What is the sum of oxidation states of all elements in polyatomic ion ( rule 3)
Charge of the ion
Eg CO3 ^2- , oxidation state is -2
Cuz (+4) + 3(-2) = -2
What is the sum of all elements in a compound (rule 4)
0
What is the oxidation state of HYGDROGEN in most compounds ( rule 5)
+1
What is the oxidation state of HYDROGEN in metal hydrides (rule 5)
-1
