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Chapter 10: Problem 21

Describe the importance of the following: (i) limestone (ii) cement (iii) plaster of paris.

Short Answer

Expert verified
Limestone is essential for cement and soil conditioning; cement is key for construction; plaster of Paris is used in construction and medical fields.

Step by step solution

01

Understanding Limestone

Limestone is a sedimentary rock consisting mainly of calcium carbonate. It has great importance in construction as a primary ingredient in cement and as a building material itself in the form of blocks or slabs for constructing buildings. Additionally, limestone is used in the purification of iron in blast furnaces and as a soil conditioner in agriculture.
02

Exploring Cement

Cement is a binding material that is crucial in the construction industry. It is made by heating limestone and clay at high temperatures and finely pulverizing the resulting clinker. Cement is essential for making concrete, which is used for constructing buildings, roads, bridges, and various infrastructures, providing compressive strength and durability to these structures.
03

Examining Plaster of Paris

Plaster of Paris is a white powder made from gypsum. When mixed with water, it forms a paste that hardens quickly and is used for gypsum plasters, construction, and artistic sculptures. In the medical field, plaster of Paris is commonly used for making orthopedic casts to support broken bones.

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Key Concepts

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

Limestone
Limestone is a sedimentary rock made largely of calcium carbonate (CaCO3). Its versatility and availability make it a valuable resource in the construction industry. As a foundational element in cement, limestone plays a critical role. Cement cannot be produced without it. Furthermore, limestone is used directly in construction, often in the form of blocks or slabs. These are used to build sturdy, aesthetically pleasing monuments or heritage buildings. Limestone also plays a part in other industries:
  • It is vital in iron purification processes within blast furnaces.
  • It serves as a soil conditioner in agriculture, improving soil health.
Limestone's importance is clear, as it not only supports construction but also contributes to agricultural and industrial processes.
Cement
Cement is a pivotal material in the construction sector. It's the glue that holds buildings and structures together. Made by heating limestone and clay to high temperatures, then grinding them into a fine powder, this material, known as "clinker," is crucial for construction. Cement becomes concrete when mixed with aggregates like sand and gravel, offering immense compressive strength. This mixture forms the backbone of modern infrastructure:
  • Buildings need it for strong foundations and integrity.
  • Roads and bridges rely on it for durability and longevity.
  • Dams and reservoirs benefit from its water-resistant properties.
Without cement, the construction industry would struggle to meet the demands of modern society's structural needs.
Plaster of Paris
Plaster of Paris is derived from gypsum and is known for its white powdery texture. This material is renowned for its quick-setting properties and varied applications. Once mixed with water, it hardens swiftly. This quality makes it ideal for creative and functional uses. In construction, it is used for:
  • Sculptural work and artistic creations.
  • Decorative panels and friezes.
  • Finishing surfaces for a smooth, aesthetic appeal.
Plaster of Paris is also significant in the medical field. It is frequently used to create orthopedic casts, supporting broken bones while they heal. These features underscore its versatility, offering support and structure both literally and creatively.

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Most popular questions from this chapter

State as to why (a) a solution of \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) is alkaline? (b) alkali metals are prepared by electrolysis of their fused chlorides? (c) sodium is found to be more useful than potassium?

Describe two important uses of each of the following: (i) caustic soda (ii) sodium carbonate (iii) quicklime.

What happens when (i) sodium metal is dropped in water? (ii) sodium metal is heated in free supply of air? (iii) sodium peroxide dissolves in water?

Which of the alkali metal is having least melting point? (a) Na (b) \(\mathrm{K}\) (c) \(\mathrm{Rb}\) (d) Cs

Comment on each of the following observations: (a) The mobilities of the alkali metal ions in aqueous solution are \(\mathrm{Li}^{+}<\mathrm{Na}^{+}<\mathrm{K}^{+}\) \(<\mathrm{Rb}^{+}<\mathrm{Cs}^{+}\) (b) Lithium is the only alkali metal to form a nitride directly. (c) \(\mathrm{E}^{\ominus}\) for \(\mathrm{M}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightarrow \mathrm{M}(\mathrm{s})\) (where \(\mathrm{M}=\mathrm{Ca}, \mathrm{Sr}\) or \(\mathrm{Ba}\) ) is nearly constant.
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