Test Yourself A level Chemistry - Y12 Redox

[@danielaadanemhen8556]

I was struggling with this topic and needed practical examples for this topic and now I understand it so thank you

[@hydersunfearless2519]

9:41 Why does each oxygen have -2 and have 3 of them? Please help, I dont get it

[@elliekate8696]

the overall charge of the sulfate (IV) ion is -2 (says in the table), we know that the sulfur has a charge of +4 because thats what the (IV) means. So in order for the overall molecule to have a charge of -2 we need the total charge of the O molecules to be -6 (+4 - 6 = -2) -6 / -2 (-2 = charge of oxygen atoms) = 3 so there is 3 O atoms

[@hydersunfearless2519]

@@elliekate8696 Thanks Ellie! I get it now!

[@omi.p8666]

this is so helpfull thank you.

[@amirah3791]

hi! when looking at oxidation states, i know the subscript affects the number, but i wanted to ask if the coefficients do as well? for example, in Mn02, oxygen's oxidation state becomes -4 which in turn makes Mn +4, but in 2H2O, does the coefficient 2 affect the states? so would it be +2 (H) and -2 (O), or would they be affected by that coefficient and become +4 and -4?

[@MaChemGuy]

Coefficients don’t impact oxidation numbers.

[@amirah3791]

@@MaChemGuy thank you!

[@azzyntll]

Is this ocr

[@MaChemGuy]

@@azzyntll yes but applicable to all exam boards

[@user-gi3yr1gl7j]

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