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6.2 Organic chemistry

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Question 1
F

The table shows the number of carbon atoms in the alkane molecules of four fractions from crude oil.

FractionNumber of carbon atoms in each molecule
P1 to 4
Q5 to 6
R7 to 10
S11 to 16

Alkanes have the general formula CnH2n+2\mathrm{C_{n}H_{2n+2}}Cn​H2n+2​. A sample from one fraction contains alkanes with relative formula masses from 100 to 142.

Relative atomic mass (ArA_rAr​): C = 12.0 H = 1.0

Which fraction is the sample from?

[1]
A

Fraction P

B

Fraction Q

C

Fraction R

D

Fraction S

Markscheme

6.2 Organic chemistry Questions

  1. GCSE
  2. /Chemistry
  3. /6.2 Organic chemistry

63 exam-style questions on OCR GCSE Chemistry 6.2 Organic chemistry, covering 6.2.1 Crude oil and fractional distillation, 6.2.2 Cracking and dependence on hydrocarbons, 6.2.3 Functional groups and homologous series, 6.2.4 Reactions of alkanes, alkenes and alcohols, 6.2.5 Addition polymerisation and repeat units, 6.2.6 Naturally occurring polymers, 6.2.7 Chemical cells and fuel cells, and 6.2.8 Condensation polymerisation and how to make one. Each one has a worked solution and a mark scheme showing where the marks go.

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