Problem 26 What are allotropes? Give an exa... [FREE SOLUTION]

Chapter 2: Problem 26

What are allotropes? Give an example. How are allotropes different from isotopes?

Short Answer

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Allotropes are different structural forms of the same element; an example is carbon's diamond and graphite forms. They differ from isotopes, which are atoms with the same proton number but different neutron numbers.

Step by step solution

Define Allotropes

Allotropes are different structural forms of the same element, in which the molecules are composed of the same atoms but are arranged in different ways. This variation in arrangement leads to distinct physical and chemical properties.

Provide an Example of Allotropes

A classic example of allotropes is carbon. Carbon can exist as diamond, where the carbon atoms are bonded in a three-dimensional tetrahedral lattice, and as graphite, where carbon atoms are bonded in layers of two-dimensional planes.

Introduce Isotopes

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. This causes isotopes to have different atomic masses, but they share similar chemical properties.

Differentiate Allotropes from Isotopes

The key difference between allotropes and isotopes is the focus; allotropes refer to different forms of the same element in solid-state due to bonding and structure, while isotopes refer to variations in atomic composition due to different neutron numbers.

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Key Concepts

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

Structural Forms

Allotropes represent different structural forms that an element can take. This means the atoms of the element are arranged in distinct ways, even though the chemical makeup remains unchanged. The differences in structure result in varied properties for each allotrope. For example, the way atoms are bonded and positioned can influence whether a material is hard, soft, conductive, or not. Understanding the structural forms of an element is crucial because these forms determine the material鈥檚 characteristics. In essence, an element like carbon can take multiple forms, each having its unique set of properties due to the specific arrangement of its atoms.

Carbon Example

Carbon is a fascinating element because it has multiple allotropes. These include well-known forms such as diamond and graphite. In its various allotropes, carbon showcases its ability to bond in different ways, showcasing diversity in its structural forms. This diversity is due to carbon's versatility in forming bonds with itself, creating structures that range from extremely hard to very soft. Other examples of carbon allotropes include fullerenes and carbon nanotubes, which further illustrate carbon's adaptability in forming different structures. Each form, though made up of only carbon atoms, displays unique physical properties due to the differences in atomic arrangement.

Diamond and Graphite

Two of the most recognized allotropes of carbon are diamond and graphite. In diamonds, carbon atoms are each bonded to four other carbon atoms, forming a strong three-dimensional tetrahedral lattice. This structure makes diamonds incredibly hard and is the reason for its brilliance and high refractive index. On the other hand, graphite has a layered structure where carbon atoms are bonded in sheets arranged in a plane. These planes are held together by weak forces, allowing them to slide over each other easily. This is why graphite is soft and slippery and is used as a lubricant and in pencils.

Isotopes vs Allotropes

While allotropes refer to different structural forms of the same element, isotopes are about variations in atomic composition. Isotopes have identical chemical properties but differ in mass due to varying numbers of neutrons in the nucleus. For instance, carbon has isotopes like Carbon-12 and Carbon-14, which have 6 protons each but differ in neutron count. Allotropes focus on the bonding and structure of elements found in solid-state, such as graphite and diamond. In contrast, isotopes denote elements' atomic variations, highlighting the difference between physical structure in allotropes and atomic nucleus in isotopes.

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What are allotropes? Give an example. How are allotropes different from isotopes?

Short Answer

Step by step solution

Define Allotropes

Provide an Example of Allotropes

Introduce Isotopes

Differentiate Allotropes from Isotopes

Key Concepts

Structural Forms

Carbon Example

Diamond and Graphite

Isotopes vs Allotropes

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