chap 7 redox chemistry

Cards (20)

when a substance gain oxygen atoms, it has oxidised
when a substance lose hydrogen atoms, it has oxidised
when oxidation state of atom increased, it has oxidised
when a substance gains hydrogen atoms, it has reduced
when a substance lose oxygen atoms, it has reduced
when oxidation state of atom decreased, it has reduced
oxidation state of element is 0
oxidation state of hydrogen in compounds is +1
oxidation state of oxygen in compounds is -2
oxidation state of metals in compounds is their ionic charge
total oxidation state of a compounds is 0
when substance loses electrons, is has oxidised
when substance gains electrons, it has reduced
what is an oxidising agent?
it is a substance that oxidises another substance and is itself reduced in the process
what is an reducing agent?
it is a substance that reduces another substance and is itself oxidised in the process
test for oxidising agent
add the solution into potassium iodide solution, and it should turn from colourless to brown
test for reducing agent
add solution into acidified potassium manganate (VII) solution, and it should turn from purple to colourless or pale pink
disproportionation reaction is a redox reaction where the same element is both oxidised and reduced simultaneously
name a reducing agent
potassium iodide
name oxidising agent
acidified potassium manganate (VII) or acidified potassium dichromate (VI)