Alkanes
Chapter Name : Hydrocarbons |
Sub Topic Code : 102_11_13_02_07 |
Topic Name : Alkanes |
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Sub Topic Name : Chemical Properties Of Alkanes |
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Introduction
Alkane molecules are nonpolar and therefore generally do not react with ionic compounds such as most laboratory acids, bases, oxidizing agents, or reducing agents.
Pre-Requisites:
Alkanes
Activity:
Crude oil.
Real Life Question:
Why are alkanes sometimes called paraffin?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| combustion reaction | A chemical reaction in which a substance combines with molecular oxygen to make oxygen-containing compounds of other elements in the reaction. |
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:
Neither positive ions nor negative ions are attracted to a nonpolar molecule. In fact, the alkanes undergo so few reactions that they are sometimes called paraffin, from the Latin parum affinis, meaning “little affinity.”
What you learn in Practice:
Alkanes are merely mixed with oxygen (O2) at room temperature, but when a flame or spark provides the activation energy, a highly exothermic combustion reaction proceeds vigorously.