oxidation reduction redox

What is oxidation state

A hypothetical charge of an atom assuming the bonding is completely ionic

What should the total sum of oxidation state be except for molecular ion

ZERO

But in molecular ion it should be the charge of the ion

What is the maximum and minimum oxidation state of an element

Maximum is its group numebr

Minimum is griup number - 8

What is the rules for o.s fo oxygen

-2 except peroxides where its -1

IN OF2 its +2

What is o.s of hydrogen

+1 but in metallic her=drides = -1

What is the o.s of group 1 ad 2

1 = +1

2= +2

What elements o.s vary

Transition elements and p block vary

In simple binary compounds the more electronegative has

The more electronegative event has negative oxidation state

D block elements o.s is

ITS SHOWN

CopperII= cu2+

What is dangerus about Fe(II) and Fe(III)

It can cause cell damage and cancer in th brain

That’s why measuring the oxidation state of fe in tumour - determines severity of cancer

All molecules ending in ——- contain —— block elements and some oxygen atoms

All molecules ending in TE contain d or p block element atoms and som oxygen atoms

How do you explain how a reaction is redox in an exam

Say what has been oxidised and show oxidation states

Say what has been reduced and show oxidation’s states

redox reactions occur when there is an oxidation and reduction reaction happening in the same reaction

What do oxidising agents do?

Accept electrons

They take the electron from the element being oxidised

How are oxididsmg agents used in our body?

HDROGEN PEROXIDE is formed - cause damage to cell and cause it to bust

Healthy cells can convert the altered DNA back to normal

Cancer+ ageing + heart disease slow down this rate

ANTIOXIDANTS (V.E or V.C0 remove oxidising agents from our body so slow down the alteration of DNA

What does cr2072- make

What is half equTIOSN

Involve electrons and only one species is either oxidised or reduced

Ionic equations do not involve electrons - 2 species are involved where one is oxidised one is reduced

2 half equations combined form an ionic equation

How do u do half equations

Multiply half equations to make same electrons in both equations

Add together and cancel

What do you have to make sure when combining half equations

That one is oxidastion and one is reduction equation

If there not - must rearrange it