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Learning objective

Write balanced equations for the complete combustion of hydrocarbons with a given formula.

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Topic

Carbon compounds as fuels and feedstock

Subtopic

Properties and combustion of hydrocarbons

Aqa Gcse ChemistryOrganic chemistry

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Quick explanation

Write balanced equations for the complete combustion of hydrocarbons with a given formula

  • This point belongs to Carbon compounds as fuels and feedstock, especially Properties and combustion of hydrocarbons.
  • You need to be able to write balanced equations for the complete combustion of hydrocarbons with a given formula.
  • The key ideas to know are combustion, hydrocarbon, and complete combustion.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

combustionhydrocarboncomplete combustion

Why it matters

This objective helps connect Properties and combustion of hydrocarbons to exam-style questions, flashcards, and revision notes for Carbon compounds as fuels and feedstock.

Quick student answer

What is the symbol equation for Carbon compounds as fuels and feedstock?

Direct answer

In Chemistry, this page helps you answer equation questions about write balanced equations for the complete combustion of hydrocarbons with a given formula in Carbon compounds as fuels and feedstock. Focus on the correct reactants, products, symbols, units where needed, and the link between the equation and the science idea. Key terms to check are complete combustion and balanced equation.

Key terms

  • complete combustion: A chemical reaction where a hydrocarbon reacts with oxygen to produce carbon dioxide and water.
  • balanced equation: An equation that has the same number of atoms of each element on both sides, representing the conservation of mass.

Common trap

Mis‑balancing the combustion equation: Balance the equation by first determining the number of CO2 molecules from the carbon atoms (n) and the number of H2O molecules from the hydrogen atoms ((2n+2)/2 = n+1). Then calculate the required O2: 2n+ (n+1) = 3n+1 moles of O2. The correct balanced equation is CnH2n+2 + (3n+1)/2 O2 → n CO2 + (n+1) H2O.

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