Problem 24 List the allotropes of phosphoro... [FREE SOLUTION]

Chapter 8: Problem 24

List the allotropes of phosphorous.

Short Answer

Expert verified

Answer: The four main allotropes of phosphorous are white phosphorous, red phosphorous, violet phosphorous, and black phosphorous.

Step by step solution

Research the allotropes of phosphorous

Before listing the allotropes of phosphorous, we need to know what they are. Through research, we find that there are four main allotropes of phosphorous: white phosphorous, red phosphorous, violet phosphorous, and black phosphorous.

List the allotropes of phosphorous

Now, we can list the four main allotropes of phosphorous: 1. White phosphorous 2. Red phosphorous 3. Violet phosphorous 4. Black phosphorous

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

White Phosphorus

White phosphorus is one of the most well-known allotropes of phosphorus. It appears as a waxy, white solid and is known for its glowing nature in the dark due to a phenomenon called chemiluminescence.
This allotrope is highly reactive and can spontaneously ignite if exposed to air. Because of its high reactivity, white phosphorus is stored under water or inert gas to prevent it from coming into contact with oxygen.
White phosphorus is structured in a tetrahedral formation known as a P4 molecule, where four phosphorus atoms form a triangular pyramid.

It is used industrially in the production of phosphoric acid and plastics.
Due to its properties, it also has applications in military incendiary devices.

Red Phosphorus

Red phosphorus is a more stable version of phosphorus compared to its white counterpart. It is a non-toxic and less reactive allotropic form that occurs in an amorphous structure.
Red phosphorus appears as a dark red powder and is not as prone to ignite in air as white phosphorus. This makes it a safer alternative for many applications.
It is produced by heating white phosphorus under controlled conditions. In this process, the tetrahedral P4 chains are broken and rearranged into a network, giving red phosphorus its stability.

It is commonly used in the safety match industry.
Red phosphorus is also utilized in the chemical industry for making pesticides, pyrotechnics, and certain flame retardants.

Violet Phosphorus

Violet phosphorus, sometimes referred to as Hittorf's phosphorus, is a lesser-known but significant allotrope. This allotrope is formed under high temperatures and can be described as a polymeric structure.
Its color appears violet, or sometimes black, depending on the light quality and structure sample. Violet phosphorus is even less reactive than red phosphorus.
This makes it suitable for experimentation where less reactivity is required. Violet phosphorus can be prepared by heating red phosphorus in a sealed tube at about 550掳C. During this conversion, it undergoes a change into a crystalline form.

Violet phosphorus offers insights into phosphorus crystallinity and behavior under different conditions.
It doesn't have widespread commercial applications but is valued in scientific research.

Black Phosphorus

Black phosphorus is the most stable and thermodynamically favored allotrope of phosphorus. With its layered structure, similar to graphite, black phosphorus has gained attention for its interesting electronic properties.
It is formed by heating white or red phosphorus under high pressures. The structure is made up of puckered sheets, which contribute to its stability and favorable properties.
Black phosphorus has gained interest in materials science, especially for its use in innovative electronic devices.

It functions as a semiconductor, which means it can conduct electricity under certain conditions.
With its unique properties, it holds potential for use in future nanotechnology and high-performance electronic applications.

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List the allotropes of phosphorous.

Short Answer

Step by step solution

Research the allotropes of phosphorous

List the allotropes of phosphorous

Key Concepts

White Phosphorus

Red Phosphorus

Violet Phosphorus

Black Phosphorus

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