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6.2 Organic chemistry

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Question 28

A refinery is testing the catalytic cracking of C19H40\mathrm{C_{19}H_{40}}C19​H40​. Analysis shows that, for every molecule of C19H40\mathrm{C_{19}H_{40}}C19​H40​ that reacts, the following hydrocarbons form.

HydrocarbonNumber of molecules
Ethene, C2H4\mathrm{C_2H_4}C2​H4​2
Propane, C3H8\mathrm{C_3H_8}C3​H8​1
X2
a.

Calculate the formula of X.

[2]
b.

Explain whether X is an alkane or an alkene.

[2]
Markscheme

6.2 Organic chemistry Questions

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

131 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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