ChemistryChapter 16: Hydrocarbons
Alkanes — Reactions
Combustion: CO2 + H2O if complete; CO / C if not (air chapter).
Learning objectives
- Define reactions using accurate chemistry terms.
- Explain why reactions matters within alkanes.
- Apply the learning unit to an FBISE-style example, comparison, diagram, or calculation.
Definition
Combustion: CO2 + H2O if complete; CO / C if not (air chapter). Substitution with Cl2 in UV (free radical named): CH4 + Cl2 -> CH3Cl + HCl as a type, not a chlorination plant. Cracking named in energy. Source: crude oil fraction; cracking makes shorter alkanes and alkenes. This page separates the idea from the wider topic “ALKANES” so it can be revised and assessed on its own.
Important terms
- REACTIONS
- Combustion: CO2 + H2O if complete; CO / C if not (air chapter).
- ALKANES
- Alkanes are saturated hydrocarbons: only C-C and C-H single bonds.
Overview
Study this learning unit in three steps:
Key Idea
Combustion: CO2 + H2O if complete; CO / C if not (air chapter). Substitution with Cl2 in UV (free radical named): CH4 + Cl2 -> CH3Cl + HCl as a type, not a chlorination plant. Cracking named in energy. Source: crude oil fraction; cracking makes shorter alkanes and alkenes.
Examples Blue flame complete · UV / Cl2 named · No other easy addition
Exam Application
Exam alkane: saturated, CnH2n+2 main reaction: combustion Cl2 / UV substitution named, not a factory
Examples Blue flame complete · UV / Cl2 named · No other easy addition
WHAT — ALKANES — REACTIONS
Combustion: CO2 + H2O if complete; CO / C if not (air chapter). Substitution with Cl2 in UV (free radical named): CH4 + Cl2 -> CH3Cl + HCl as a type, not a chlorination plant. Cracking named in energy. Source: crude oil fraction; cracking makes shorter alkanes and alkenes. This page separates the idea from the wider topic “ALKANES” so it can be revised and assessed on its own.
WHY — Why this topic matters
ALKANES — REACTIONS is an independent FBISE learning unit because students must use its definitions, conditions, equations, or trends separately in explanations and calculations.
HOW — How it works
Combustion: CO2 + H2O if complete; CO / C if not (air chapter). Substitution with Cl2 in UV (free radical named): CH4 + Cl2 -> CH3Cl + HCl as a type, not a chlorination plant. Cracking named in energy. Source: crude oil fraction; cracking makes shorter alkanes and alkenes. Examples: Blue flame complete; UV / Cl2 named; No other easy addition. Exam use: Exam alkane: saturated, CnH2n+2 main reaction: combustion Cl2 / UV substitution named, not a factory
Explanation
Combustion: CO2 + H2O if complete; CO / C if not (air chapter). Substitution with Cl2 in UV (free radical named): CH4 + Cl2 -> CH3Cl + HCl as a type, not a chlorination plant. Cracking named in energy. Source: crude oil fraction; cracking makes shorter alkanes and alkenes. Examples: Blue flame complete; UV / Cl2 named; No other easy addition. Exam use: Exam alkane: saturated, CnH2n+2 main reaction: combustion Cl2 / UV substitution named, not a factory
In simple words
Federal Board Class 11 Chemistry learning unit. Easy wording; no provincial-board material added.
Key points
- combustion + named sub
- burn + named sub
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Alkanes — Reactions
Sticky Notes · Quick Revision
Core idea
- Combustion: CO2 + H2O if complete; CO / C if not (air chapter). Substitution with Cl2 in UV (free radical named): CH4 + Cl2 -> CH3Cl + HCl as a type, not a chlorination plant. Cracking named in energy. Source: crude oil fraction; cracking makes shorter alkanes and alkenes. This page separates the idea from the wider topic “ALKANES” so it can be revised and assessed on its own.
WHAT
- Combustion: CO2 + H2O if complete; CO / C if not (air chapter).
WHY
- ALKANES — REACTIONS is an independent FBISE learning unit because students must use its definitions, conditions, equations, or trends separately in explanations and calculations.
HOW
- Combustion: CO2 + H2O if complete; CO / C if not (air chapter). Substitution with Cl2 in UV (free radical named): CH4 + Cl2 -> CH3Cl + HCl as a type, not a chlorination plant. Cracking named in energy. Source: crude oil fraction; cracking makes shorter alkanes and alkenes. Examples: Blue flame complete; UV / Cl2 named; No other easy addition. Exam use: Exam alkane: saturated, CnH2n+2 main reaction: combustion Cl2 / UV substitution named, not a factory
Common misconception
- Do not treat reactions as the same as every other part of alkanes; define this unit and use its own evidence, steps, or conditions.
FBISE exam check
- Define alkanes — reactions, explain how it works, and support the answer with one relevant example.
60-second revision
- Combustion: CO2 + H2O if complete; CO / C if not (air chapter).
- Blue flame complete
- Exam link: combustion + named sub.
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