OCR Chemistry B Salters Pre-release Revision 2013

Here are some questions my teacher created about the pre-release, by looking at previous papers. I have tried to answer them as best as I could, but if you have any corrections or different answers please let me know!

Thankyou! Abi ***

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2013 June Chemistry of Natural Resources



Questions on the PRE REALISE Material
for OCR Chemistry Salters B

1. What type of bond fission does nitrogen undergo when it undergoes
photolysis in the upper atmosphere?

2. What is the energy of a photon of light that has a wavelength of
100m?…

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2013 June Chemistry of Natural Resources



18. Even though it is present in very low concentration, one NO can help
decompose up to 100 molecules of O3. Explain how this can be the
case.

19. Work out the difference in % between the highest urban levels and
lowest maritime levels…

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2013 June Chemistry of Natural Resources



1. Homolytic fission

2. First find frequency:

Wavelength() x Frequency (v)= Speed of Light (c)

v= 3.0x10^8 ÷ 100 v= 3.0x10^6 Hz

Then put frequency into E=hv

E= (6.629x10^-34) x (3.0x10^6) = 1.99x10^-27 J

3. N N
4. N N O
5. NH3 +…

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2013 June Chemistry of Natural Resources



Mass 1 /
Mr 18 32
Mol (mass ÷ mr) 18 27
Mol for single molecule 9 9

27 x 24 = 648 dm^3 (24dm^3 is the volume of 1 mole of any gas at
RTP)

b) 648 is 21% of air that is…

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2013 June Chemistry of Natural Resources



2NO + 4e N2 N= NO +2 N2 0

CO CO2 + 4e C= CO +2 CO2 +4

N is being reduced and C is being oxidised, because N gains electrons and C
looses electrons.

25. The greenhouse effect is where the planet is…

Comments

Husna

oh my god that is a lot of questions. I've only read the document once and thats it.

Eleanor

This is a great way just to review everything that it mentions in the pre-release! 

Jodi

This was so helpful! thankyou

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