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?
3. Draw a dot and cross diagram to show the structure of N2.
4. Draw a dot and cross diagram to show the bonding of N2O. (look at fig
2)
5. Show how ammonia is considered alkaline by writing a balanced
equation for its reaction with water.
6. What is the oxidation state of nitrogen in each of the following?
a) N2O b) NO2 c)HNO3 d)NO e)NH3
7. N02 is a radical, what does this mean about the electronic structure of
the molecule.
8. Ammonia, NH3, has a significantly higher boiling point than NO2, N2
and NO2. How can you account for this?
9. Name one of the molecules produced in photochemical smog and an
associated problem (not from the extract).
10. a) Write an equation for the reaction of OH with ammonia.
b) Which step in a radical reaction does this show?
11. Urea is a ketone. Draw the full structural formula for it.
12. Ammonia is made in the Haber process. Write an equation to show this
formation.
13. The Haber process is a reversible reaction. Explain what would happen
to the % yield of ammonia if the pressure in the reaction vessel was
increased.
14. Convert 10ppb (parts per billion) into a % of ammonia in the
atmosphere.
15. What are the oxidation numbers of nitrogen in NH4+ and NO2-?
16. a) What volume of oxygen is needed to fully react with 1g of
ammonium ions?
b) If air is 21% oxygen by volume, what volume of air is required?
17. What state would you expect ammonium nitrate to exist in at room
temperature and why?

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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 of N02.
20. What type of radical reaction is shown by NO2 + HO HNO3?
21. Complete the display formula of PAN (peroxyacetylnitrate)
22.…read more

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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 + H20 NH4 + OH
6. a) -1 b) +4 c) -5 d) +2 e) -3
7. The molecule has an unpaired electron.
8.…read more

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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 needed. Therefore :
21/100 x ? = 648 ? = 3085.7 dm^3
17. Ammonium nitrate is a solid at room temperature because it contains
hydrogen bonds between the N and H or H and O.…read more

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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 heating up because
gases such as N2O are absorbing infra red radiation emitted from the
earth and turning the radiation into kinetic energy as their bonds
vibrate because of the radiation.
26.…read more

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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