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OCR Chemistry B (Salters) F334/F335 Exam Thread 2016 (14th/22nd June)

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Real wavelengths of light:

Blue = 475nm
Green light = 510nm
Yellow light = 570nm
Orange light = 590nm
Red light = 650nm

As this was a reflectance spectrum and there was a wider trough about the blue wavelength than at the red wavelength, it is safe to assume that 'yellow/orange' will be on the mark scheme, with slight doubt about the colour green as the peak was closer to red than blue

Reply 741

Huda musa

What did people put for the appearance of the oxide of nitrogen? I put nitrogen dioxide would form which is a brown gas, would this be correct?

Reply 742

Zuzuvela

Original post by Huda musa

What did peoppe put for the appearance of the oxide of nitrogen? I put nitrogen dioxide would form which is a brown gas, would this be correct?

No it would be Nitrogen (I) Oxide . N2O. Colourless Gas so it was trick question

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Reply 743

bablatow

naming the inorganic compounds
what did u get

Reply 744

Huda musa

Does anyone have a copy of the paper that they could upload photos of?

Reply 745

iammarylee0000

How did people find it generally? Any chance I didn't do the whole Q5 and still get like an A??

Reply 746

Bruhh

Original post by iammarylee0000

How did people find it generally? Any chance I didn't do the whole Q5 and still get like an A??

I actually thought it was nicer than 2015, although I like calculation questions. Last year it was 98 for full UMS (around 80 for an A I think). Grade boundaries will probably be similar. So you can likely drop somewhere in the region of 35-40 marks and scrape an A. Q5 was like 23-25 marks so yeah if you've done the rest reasonably well you should be fine.

Reply 747

Larache

For the p.H question with NH4Cl in equilibrium was the p.H around 11? assumed to be correct since NH3 formed is basic.

Reply 748

chloewilliamsss

agree, that's what I put

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I put this because it's not planar and I assumed that the nitrogen would form a trigonal pyramidal shape since it has three bonding pairs and one lone pair

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so it'd look a bit like this?