Topic 4 Redox reactions Flashcards
What is a redox reaction
If electrons are transferred
Reduction and oxidation happens at the same tine
What is oxidation
The gain of oxygen
The loss of electrons
What is reduction
The loss of oxygen
The gain of ekectrons
Iron atoms are oxidised when added to dilute acid equation containing hydrogen ions
Fe + 2H+ -> Fe2+ +H2
Iron oxidation reaction
Fe -2E- -> Fe2+
Hydrogen ions gain electrons when reduced
2H+ 2E- -> H2
Are displacement reactions redox reactions
Yes
What is the displacement rule
A more reactive metal will displace a less reactive metal from its compound
Example of displacement
Iron + copper sulfate -> iron sulfate + copper
What is always reduced in a displacement reaction
Metal ion
What is always oxidised in a displacement reaction
The metal atom
What happens In an ionic equation
The products just displace each other
What are spectator ions
Ions that don’t change in the reaction
What do ionic equations for displacement reactions concentrate on
The substances that were oxidised or reduced
