Alkynes
Chapter Name : Hydrocarbons |
Sub Topic Code : 102_11_13_04_03 |
Topic Name : Alkynes |
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Sub Topic Name : Preparation From Calcium Carbide |
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Introduction
Calcium carbide is a chemical compound with the chemical formula of Ca C2. Its main use industrially is in the production of acetylene and calcium cyanamide.
Pre-Requisites:
Calcium Carbide
Activity:
Graphite.
Real Life Question:
What are the steps for preparation of calcium carbibe?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Alkynes | An alkyne is a molecule made up entirely of carbon and hydrogen where on or more carbon atoms are connected by triple bonds. The general formula for an alkyne is CnH2n-2 where n is the number of carbon atoms in the molecule. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| acetylene | An alkyne is a hydrocarbon containing a triple carbon-carbon bond. |
Real life uses :
In the artificial ripening of fruit, calcium carbide is sometimes used as source of acetylene gas, which is a ripening agent similar to ethylene.
Places to visit :
Chemistry laboratory.
Practical examples around us
| Examples | Explainations |
|---|---|
| Carbide lamps | Calcium carbide is used in carbide lamps, in which water drips on the carbide and the acetylene formed is ignited. These lamps were usable but dangerous in coal mines, where the presence of the flammable gas methane made them a serious hazard. The presence of flammable gases in coal mines led to miner safety lamps such as the Davy lamp, in which wire gauze reduces the risk of methane ignition. |
What you learn in Theory:
Calcium carbide is produced industrially in an electric arc furnace from a mixture of lime and coke at approximately 2000 °C.
What you learn in Practice:
Pure calcium carbide is a colorless solid. The common crystalline form at room temperature is a distorted rock-salt structure with the C22? units lying parallel.