Alkanes
Chapter Name : Hydrocarbons |
Sub Topic Code : 102_11_13_02_09 |
Topic Name : Alkanes |
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Sub Topic Name : Combustion |
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Introduction
In a complete combustion reaction, a compound reacts with an oxidizing element, such as oxygen or fluorine, and the products are compounds of each element in the fuel with the oxidizing element.
Pre-Requisites:
Alkanes
Activity:
Crude oil.
Real Life Question:
What is combustion?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| combustion | The sequence of exothermic chemical reactions between a fuel and an oxidant accompanied by the production of heat and conversion of chemical species. The release of heat can produce light in the form of either glowing or a flame. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| liquefied petroleum gas | A flammable mixture of hydrocarbon gases used as a fuel in heating appliances and vehicles. |
Real life uses :
They are the main components of natural gas; they are normally stored as gases under pressure.
Places to visit :
Chemistry laboratory.
Practical examples around us
| Examples | Explainations |
|---|---|
| natural gas | A naturally occurring hydrocarbon gas mixture consisting primarily of methane, but commonly includes varying amounts of other higher alkanes and even a lesser percentage of carbon dioxide, nitrogen, and hydrogen sulfide. |
What you learn in Theory:
Complete combustion is almost impossible to achieve. As actual combustion reactions come to equilibrium, a wide variety of major and minor species will be present such as carbon monoxide and pure carbon.
What you learn in Practice:
Assuming perfect combustion conditions, such as complete combustion under adiabatic conditions (i.e., no heat loss or gain), the adiabatic combustion temperature can be determined. The formula that yields this temperature is based on the first law of thermodynamics and takes note of the fact that the heat of combustion is used entirely for heating the fuel, the combustion air or oxygen, and the combustion product gases.