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6.2 Organic chemistry

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Question 6

A hydrocarbon, A, is heated strongly and breaks down. The table shows the products formed from each molecule of A.

ProductFormulaNumber of molecules formed
pentaneC5H12\mathrm{C_{5}H_{12}}C5​H12​1
etheneC2H4\mathrm{C_{2}H_{4}}C2​H4​2
propeneC3H6\mathrm{C_{3}H_{6}}C3​H6​1
a.

Calculate the molecular formula of A.

Show your working.

[2]
b.

Explain why this reaction can be described as cracking.

Use your answer to (a) and the information in the table.

[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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