OCR A Chemistry F322 Chains, Energy and Resources Thu 19 Jan 2012
Chemistry exam discussion - share revision tips in preparation for GCSE, A Level and other chemistry exams and discuss how they went afterwards.
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Re: OCR A Chemistry F322 Chains, Energy and Resources Thu 19 Jan 2012Yeah thats what i was thinking aswell :P And Probably the green chemistry and things like why CFCs are bad with all them protocols and international agreements. You?(Original post by splendidsun)
aha, same, no way near as 'challenging' as I found it to be last June, probably got something to do with the new low that is A2
Section you find most challenging? -
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Re: OCR A Chemistry F322 Chains, Energy and Resources Thu 19 Jan 2012nooo(Original post by otrivine)
do we need to know how to draw skeletal formulas for paracetomol and vitamin A? -
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Re: OCR A Chemistry F322 Chains, Energy and Resources Thu 19 Jan 2012can u ask me questions? and ill ask u as well(Original post by splendidsun)
nooo -
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Re: OCR A Chemistry F322 Chains, Energy and Resources Thu 19 Jan 2012How is the alkene double bond formed?(Original post by otrivine)
can u ask me questions? and ill ask u as well
Describe some uses of alkenes
What is a disadvantage of using Hydrocarbons as alternatives to CFCs -
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Re: OCR A Chemistry F322 Chains, Energy and Resources Thu 19 Jan 2012Gotta agree with you on that one(Original post by nffc-b)
Yeah thats what i was thinking aswell :P And Probably the green chemistry and things like why CFCs are bad with all them protocols and international agreements. You?
Can't bring myself to learn the facts (kyoto protocol?)
Im guessing we need to know it though :/ -
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Re: OCR A Chemistry F322 Chains, Energy and Resources Thu 19 Jan 20121) due to pie and sigma bonds(Original post by splendidsun)
How is the alkene double bond formed?
Describe some uses of alkenes
What is a disadvantage of Hydrocarbons as using alternatives to CFCs
Pie- sideways overrlap between adjacent p orbitals
sigma bonds is the single covalent bond where shared electrons between two nuclei and electron density.
2)Plastic packaging window frame, toys
3) fill landfill site, release toxic gases -
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Re: OCR A Chemistry F322 Chains, Energy and Resources Thu 19 Jan 2012Industrial Importance of Alkenes
Manufacture of Margarine (catalytic hydrogenation of vegetable oils)
- Hydrogen molecules are added across double bonds of in addition reactions; by adding hydrogen molecules across different numbers of the many double bonds, margarine can be produced with different degrees of hardness. This affects the spreadability of the margarine)
Polymer Production
- Two types of Polymerisation: Addition polymerisation and radical polymerisation -
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Re: OCR A Chemistry F322 Chains, Energy and Resources Thu 19 Jan 2012A lot of the answers in the mark schemes for them questions about protocols and scientists telling countries what to do are normally just common sense. But when it comes to exams I have like no common sense at all aha(Original post by splendidsun)
Gotta agree with you on that one
Can't bring myself to learn the facts (kyoto protocol?)
Im guessing we need to know it though :/ -
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Re: OCR A Chemistry F322 Chains, Energy and Resources Thu 19 Jan 2012For number two, you forgot to mention the stage that takes place before use as plastic packaging/toys...they are first made into polymers following addition polymerisation(Original post by otrivine)
1) due to pie and sigma bonds
Pie- sideways overrlap between adjacent p orbitals
sigma bonds is the single covalent bond where shared electrons between two nuclei and electron density.
2)Plastic packaging window frame, toys
3) fill landfill site, release toxic gases
(which involves the addition of alkenes to a growing polymer chain) -
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Re: OCR A Chemistry F322 Chains, Energy and Resources Thu 19 Jan 2012http://www.a-levelchemistry.co.uk/OC...22-01Jun11.pdf
http://www.a-levelchemistry.co.uk/OC..._MS_June11.pdf
June 2011 paper and mark scheme for anyone who wants it btw -
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Re: OCR A Chemistry F322 Chains, Energy and Resources Thu 19 Jan 2012oh yes sorry how about the rest fine?(Original post by splendidsun)
For number two, you forgot to mention the stage that takes place before use as plastic packaging/toys...they are first made into polymers following addition polymerisation
(which involves the addition of alkenes to a growing polymer chain)
describe homolytic fission and give example (3) -
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Re: OCR A Chemistry F322 Chains, Energy and Resources Thu 19 Jan 2012The MS is too pedantic(Original post by nffc-b)
A lot of the answers in the mark schemes for them questions about protocols and scientists telling countries what to do are normally just common sense. But when it comes to exams I have like no common sense at all aha
Did you memorise statistics? (with reference to things like the 'kyoto protocol')
Doubt we need to know it such an extent though -
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Re: OCR A Chemistry F322 Chains, Energy and Resources Thu 19 Jan 2012Homolytic fission is the breaking of covalent bonds whereby one of the shared pair of electrons goes to each atom in the covalent bond to form 2 radicals.(Original post by otrivine)
oh yes sorry how about the rest fine?
describe homolytic fission and give example (3)
An example would be the initiation step in radical substitution -
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Re: OCR A Chemistry F322 Chains, Energy and Resources Thu 19 Jan 2012Yh rest is fine(Original post by otrivine)
oh yes sorry how about the rest fine?
describe homolytic fission and give example (3)
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Re: OCR A Chemistry F322 Chains, Energy and Resources Thu 19 Jan 2012correct but say FREE radical substituiton me now(Original post by splendidsun)
Homolytic fission is the breaking of covalent bonds whereby one of the shared pair of electrons goes to each atom in the covalent bond to form 2 radicals.
An example would be the initiation step in radical substitution -
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Re: OCR A Chemistry F322 Chains, Energy and Resources Thu 19 Jan 2012Nice(Original post by otrivine)
correct but say FREE radical substituiton me now
What is the Ziegler Natta process?
What is the Kyoto Protocol? -
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Re: OCR A Chemistry F322 Chains, Energy and Resources Thu 19 Jan 2012ziegler natta process- plastic production in poly(ethene)(Original post by splendidsun)
What is the Ziegler-Natta process?
which page is on the Kyotot thing?
