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Edexcel A-Level Chemistry AS 4.17 The Reactions of Alkanes with I Oxygen in the Air Combustion Ii Halogens Questions

Use marked Edexcel IAL Chemistry questions to write alkane combustion equations and predict halogen substitution products, conditions and observations.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Write balanced complete-combustion equations for named alkanes.
  • Predict alkane–halogen observations and substitution equations from light conditions.

Edexcel A-Level Chemistry AS 4.17 The Reactions of Alkanes with I Oxygen in the Air Combustion Ii Halogens Questions question 1

[Maximum number: 2]

Fuels

Fuels burn in oxygen to release a lot of energy.
Many hydrocarbons and alcohols are used as fuels. During complete combustion, they produce carbon dioxide and water.

Petrol contains 2,2,4-trimethylpentane, an isomer of octane, that promotes smooth combustion.

Figure for Question Edexcel A-Level Chemistry AS 4.17 The Reactions of Alkanes with I Oxygen in the Air Combustion Ii Halogens Questions question 1 — Edexcel A-Level Chemistry AS

2,2,4-trimethylpentane

Alcohols, such as methanol and ethanol, can be used as fuels either on their own or as additives in petrol.

The standard enthalpy change of combustion, ΔcH⊖\Delta_{\mathrm{c}} H^{\ominus}, of 2,2,4-trimethylpentane is −5461 kJ mol−1-5461 \mathrm{~kJ} \mathrm{~mol}^{-1}.

Write the equation for the complete combustion of 2,2,4-trimethylpentane, using molecular formulae. State symbols are not required.

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