Alkanes as Fuel
Use this landing page to move quickly between the main fuel-related alkane revision pages for OCR A Level Chemistry A OCR 4.1.2. These pages cover combustion, sulfur oxide pollution, nitrogen oxide pollution and how catalytic converters reduce harmful exhaust emissions.
Choose an Alkanes as Fuel Page
Alkanes are widely used as fuels because combustion is exothermic and releases useful energy. These pages separate the fuel topic into combustion chemistry, pollutant formation and catalytic converter treatment so students can connect equations, reaction conditions and environmental consequences.
Key idea: Complete combustion produces carbon dioxide and water, but real fuel combustion can also produce carbon monoxide, particulates and acidic or photochemical pollutants from sulfur and nitrogen oxides.
Combustion
Revise complete and incomplete combustion of alkanes, including the key products, equations and why combustion releases energy.
Start revisingOxides of Sulfur
Learn how sulfur impurities in fuels form sulfur dioxide and how sulfur oxides contribute to acid rain and environmental damage.
Start revisingOxides of Nitrogen
Review how high temperatures in engines allow nitrogen and oxygen from air to react, producing nitrogen oxides that cause pollution.
Start revisingCatalytic Converter
Revise how catalytic converters use transition metal catalysts to convert harmful exhaust gases into less harmful products.
Start revisingHow to Use These Pages
Start with combustion to secure the chemical equations for alkane fuels. Then revise sulfur oxides and nitrogen oxides as pollutant case studies before finishing with catalytic converters. For each page, practise writing balanced equations and linking chemical changes to environmental consequences.
Exam focus: Be able to write combustion equations, explain why pollutants form in engines and describe how catalytic converters reduce carbon monoxide, nitrogen oxides and unburnt hydrocarbons.
Master Basic Concepts of Organic Chemistry and Alkanes for OCR A Level Chemistry A
Continue from these free revision notes into the full 4.1.1 and 4.1.2 Basic Concepts of Organic Chemistry and Alkanes course. The guided video lessons are ready now; the OCR A MCQ bank, teacher-marked short-answer questions and KASP spec-point report are being written, and the course opens for enrolment as soon as they are complete.
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Some ionic radii are shown.
| Ion | Ionic radius / nm |
|---|---|
| Na+ | 0.102 |
| K+ | 0.138 |
| F− | 0.133 |
| Cl− | 0.180 |
Which compound has the strongest ionic bonding?
Explain why the metallic bonding in magnesium is much stronger than that in sodium.
Copyright notice: This revision page, including its written explanations, layout and teaching sequence, is produced for Online Learning System by Dr. Mohammed Al-Fatah. It is intended for student revision and may not be copied, redistributed or republished without permission.
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