OCR B (Salters) F332 Tuesday 4th June 2013 Exam Discussion (Now Closed)

No I meant in terms of boiling and melting points not bonds and structure

That ^ is the explanation for why SiO2 his a higher boiling an higher melting point than CO2.

The bonding and structure is what makes the boiling points differ,

Co2 has weak inter molecular forces so less energy is required to break bonds, this means the melting/ boiling point is much lower whereas Si02 has strong covalent bonds which require a lot of energy so has a higher temperature!
Remember Sio2 does NOT have inter molecular forces

I pretty sure they'll have a OZone question

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really wish i'd gone to bed earlier, ugh

I can't remember the paper, but you know the question with 'Snottites' and it was a moles question, I didn't get how the last part was found, could somone help aha

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I can't remember the paper, but you know the question with 'Snottites' and it was a moles question, I didn't get how the last part was found, could somone help aha

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17) N₂O is present in air at a concentration of 310 ppbv.

(a) Given a cubic metre contains 10 ⁶ cm³, calculate how many cm³ of N₂O would be in a cubic metre of air

how do we do this?

Found it Its Jan 12 one sec I'll post it

Moleh of NaOH= $\frac{26.4}{1000}*0.05=0.00132$ Moles= concentration*volume, make sure you convert to dm3 by dividing by 1000

for part 2 divide by 2 as the ratio

finally divide your moles by the volume for the concentration

310/ 10^9*10^6

How is HNO3 removed from the atmosphere via wet deposition ?

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Erm acid rain, snow, fog?

Enothermic has positive sign.

Describe and explain the effect of
i) an increase in pressure on the rate of reaction.
ii) an increase in pressure on the equilibrium yield of the reaction.
iii.)an increase in temperature on the equilibrium yield of the reaction.


Can someone explain to me I'm so confused