Advanced Higher Chemistry 2012-2013

Y is +3, Ba 2+, O -2

3 + (2x2) + (-2x7) = -7

so Cu3 = +7
so Cu = +7/3
= +2.33

Can someone please help me with this question:


I understand why C and D are not options, as they can not be oxidised, however I don't get the difference between primary and secondary alcohols.

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thats a terrible picture what concentration change are you talking about?

Really not confident with this exam. The more I study, the more I realise how much I dont know

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Bright Red Book

pH of Benzoic acid

Concentration = 0.2 mol/l

$\displaystyle pH = \dfrac{1}{2}(pK_a-logc)$

I get 1.6, but the answer is 2.45

Do partial pressures ever come up?

I have never seen it come up in the papers I have (10 years old), so I think it is safe to say no

I've compiled three separate Word documents each with a particular unit's PPAs in it, in bullet point form. I've tried to summarise as best as possible, though there may be some stuff omitted; I tried to pick out the most crucial points. It is still quite informative but I thought it would be useful for trying to memorise a list, if that's your thing.

Let me know if you want them.

Really not confident with this exam. The more I study, the more I realise how much I dont know

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I just done this calculation and got 2.45
Did you put-
pH=1/2 x 4.2-(1/2log(0.2))
=2.45

How do you do question 28?

i get entropy and how an increase is changing from solid - liquid - gas, decrease is the reverse... but i can never get my head around these questions?