ChemistryChapter 18: Alcohol
Combustion and Dehydration — Combustion
C2H5OH + 3O2 -> 2CO2 + 3H2O.
Learning objectives
- Define combustion using accurate chemistry terms.
- Explain why combustion matters within combustion and dehydration.
- Apply the learning unit to an FBISE-style example, comparison, diagram, or calculation.
Definition
C2H5OH + 3O2 -> 2CO2 + 3H2O. Incomplete: CO. Bioethanol named as a fuel slogan. No engine-tuning. Elimination mechanism E1/E2 named lightly — product alkene from alcohol. This page separates the idea from the wider topic “COMBUSTION AND DEHYDRATION” so it can be revised and assessed on its own.
Important terms
- COMBUSTION
- C2H5OH + 3O2 -> 2CO2 + 3H2O.
- COMBUSTION AND DEHYDRATION
- Alcohols burn: CO2 + H2O if complete (ethanol fuel slogan, not a still design).
Overview
Study this learning unit in three steps:
Key Idea
C2H5OH + 3O2 -> 2CO2 + 3H2O. Incomplete: CO. Bioethanol named as a fuel slogan. No engine-tuning. Elimination mechanism E1/E2 named lightly — product alkene from alcohol.
Examples Blue flame · Water from H and OH · Carbon footprint later
Exam Application
Exam ethanol dehydration: hot conc H2SO4 (named) C2H5OH -> C2H4 + H2O alkene; reverse is hydration of ethene
Examples Blue flame · Water from H and OH · Carbon footprint later
WHAT — COMBUSTION AND DEHYDRATION — COMBUSTION
C2H5OH + 3O2 -> 2CO2 + 3H2O. Incomplete: CO. Bioethanol named as a fuel slogan. No engine-tuning. Elimination mechanism E1/E2 named lightly — product alkene from alcohol. This page separates the idea from the wider topic “COMBUSTION AND DEHYDRATION” so it can be revised and assessed on its own.
WHY — Why this topic matters
COMBUSTION AND DEHYDRATION — COMBUSTION 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
C2H5OH + 3O2 -> 2CO2 + 3H2O. Incomplete: CO. Bioethanol named as a fuel slogan. No engine-tuning. Elimination mechanism E1/E2 named lightly — product alkene from alcohol. Examples: Blue flame; Water from H and OH; Carbon footprint later. Exam use: Exam ethanol dehydration: hot conc H2SO4 (named) C2H5OH -> C2H4 + H2O alkene; reverse is hydration of ethene
Explanation
C2H5OH + 3O2 -> 2CO2 + 3H2O. Incomplete: CO. Bioethanol named as a fuel slogan. No engine-tuning. Elimination mechanism E1/E2 named lightly — product alkene from alcohol. Examples: Blue flame; Water from H and OH; Carbon footprint later. Exam use: Exam ethanol dehydration: hot conc H2SO4 (named) C2H5OH -> C2H4 + H2O alkene; reverse is hydration of ethene
In simple words
Federal Board Class 11 Chemistry learning unit. Easy wording; no provincial-board material added.
Key points
- complete vs not
- ethene + water
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Combustion and Dehydration — Combustion
Sticky Notes · Quick Revision
Core idea
- C2H5OH + 3O2 -> 2CO2 + 3H2O. Incomplete: CO. Bioethanol named as a fuel slogan. No engine-tuning. Elimination mechanism E1/E2 named lightly — product alkene from alcohol. This page separates the idea from the wider topic “COMBUSTION AND DEHYDRATION” so it can be revised and assessed on its own.
WHAT
- C2H5OH + 3O2 -> 2CO2 + 3H2O.
WHY
- COMBUSTION AND DEHYDRATION — COMBUSTION is an independent FBISE learning unit because students must use its definitions, conditions, equations, or trends separately in explanations and calculations.
HOW
- C2H5OH + 3O2 -> 2CO2 + 3H2O. Incomplete: CO. Bioethanol named as a fuel slogan. No engine-tuning. Elimination mechanism E1/E2 named lightly — product alkene from alcohol. Examples: Blue flame; Water from H and OH; Carbon footprint later. Exam use: Exam ethanol dehydration: hot conc H2SO4 (named) C2H5OH -> C2H4 + H2O alkene; reverse is hydration of ethene
Common misconception
- Do not treat combustion as the same as every other part of combustion and dehydration; define this unit and use its own evidence, steps, or conditions.
FBISE exam check
- Define combustion and dehydration — combustion, explain how it works, and support the answer with one relevant example.
60-second revision
- C2H5OH + 3O2 -> 2CO2 + 3H2O.
- Blue flame
- Exam link: complete vs not.
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