key term - $FeS_2$

Definition

$FeS_2$, also known as iron(II) disulfide or pyrite, is a naturally occurring mineral that is an important source of sulfur and has various applications in industry and chemistry. This term is particularly relevant in the context of the topics covered in Section 18.10: Occurrence, Preparation, and Properties of Sulfur.

5 Must Know Facts For Your Next Test

1. $FeS_2$ is the most abundant sulfur-containing mineral on Earth, found in sedimentary and metamorphic rocks.
2. Pyrite can be used as a source of sulfur and iron, and is also used in the production of sulfuric acid, which is a widely used industrial chemical.
3. The oxidation of $FeS_2$ can lead to the formation of acid mine drainage, which can have negative environmental impacts.
4. Pyrite is sometimes used as a gemstone, although it is not as valuable as true gold due to its lower purity and hardness.
5. The decomposition of $FeS_2$ can release sulfur dioxide, which is a major air pollutant and contributor to acid rain.

Review Questions

• Explain the occurrence and natural sources of $FeS_2$.
  • $FeS_2$, also known as pyrite, is a naturally occurring mineral that is widely distributed in the Earth's crust. It is found in sedimentary, metamorphic, and igneous rocks, and is the most abundant sulfur-containing mineral on the planet. Pyrite is often associated with other sulfide minerals and can be found in a variety of geological settings, including coal deposits, hydrothermal vents, and sedimentary basins.
• Describe the preparation and industrial applications of $FeS_2$.
  • While $FeS_2$ is primarily a naturally occurring mineral, it can also be prepared synthetically for industrial purposes. The most common method of preparing $FeS_2$ is through the reaction of iron and sulfur at high temperatures. Industrially, $FeS_2$ is used as a source of sulfur and iron, and is a key raw material in the production of sulfuric acid, which is one of the most widely used industrial chemicals. Pyrite is also used in the production of pigments, as a source of sulfur dioxide, and in some specialized applications, such as the production of flint and the creation of pyrite gemstones.
• Analyze the potential environmental impacts associated with the occurrence and properties of $FeS_2$.
  • The presence of $FeS_2$ in the environment can lead to significant environmental concerns, particularly when it undergoes oxidation. The oxidation of $FeS_2$ can result in the formation of acid mine drainage, which is a highly acidic and metal-rich solution that can contaminate nearby water bodies and soil. This acidic runoff can have detrimental effects on aquatic ecosystems, as well as on infrastructure and human health. Additionally, the decomposition of $FeS_2$ can release sulfur dioxide, a major air pollutant that contributes to acid rain and other environmental issues. Understanding the properties and potential impacts of $FeS_2$ is crucial for developing effective strategies to mitigate these environmental concerns.

Related terms

Pyrite:

Pyrite is the mineral form of $FeS_2$, often referred to as 'fool's gold' due to its golden-yellow metallic luster.

Sulfur Cycle: The sulfur cycle is the biogeochemical cycle that describes the movement of sulfur through the Earth's atmosphere, hydrosphere, and lithosphere, with $FeS_2$ playing a role in this cycle.

Oxidation-Reduction Reactions:

The conversion of $FeS_2$ to other sulfur compounds, such as sulfuric acid, involves a series of oxidation-reduction reactions.