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Physical and Chemical Properties of Carbon make carbon uniquе among thе еlеmеnts. Thеsе propеrtiеs havе a profound impact on thе divеrsity and complеxity of carbon-basеd compounds, making carbon thе basis of organic chеmistry.
- An element with an atomic number of 6, carbon is a non-metallic chemical.
- It is a main ingredient in many organic molecules.
- Given that all living things are composed of organic substances, carbon is crucial to our survival. 18% of carbon is found in human tissue.
- In technology, carbon is used in many different contexts, such as steel manufacture, carbon dating, jewellery, paints, synthetic fibres, and synthetic fibres.
- Diverse types of bonds between carbon atoms can result in the formation of allotropes
- Graphite and diamond, which both have various crystalline forms, are the two most well-known allotropes.
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Key terms: Carbon, Isotopes, Atomic Number, Graphite, Allotropes, Non-Metallic, Oxygen
Carbon
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Carbon is a nonmetallic and tetravalent chemical element, making up about 0.025 percent of Earth's crust. It ranks as the 15th most prevalent element in the Earth's crust and the fourth most plentiful element in the universe by mass.
- It is one of the few elements that has been known since antiquity.
- All known life has carbon, which is a common component due to its abundance, distinctive diversity of organic compounds, and capacity to form polymers
- After oxygen, it is the second most prevalent element in terms of mass in the human body.
- Graphite, diamond, amorphous carbon, and fullerenes are examples of carbon allotropes.
- Allotropic forms of carbon have different physical characteristics, with graphite being opaque and black and diamond being extremely transparent.
- Under normal circumstances, all carbon allotropes are solids.
Application of Carbon
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All biological systems require carbon, which is typically utilised in the form of hydrocarbons like crude oil and methane gas. Plant structures are maintained by cellulose, a naturally occurring polymer that contains carbon. Wool, cashmere, and silk are examples of carbon polymers with high animal value.
- Crude oil is used to create synthetic carbon polymers, which have oxygen and nitrogen atoms as part of the primary polymer chain.
- Applications for carbon and its compounds include the creation of alloys with iron, graphite, lubricants, and pigments.
- Along with being employed in many other industries, carbon is also used in polymers, iron smelting, and art.
- Plastics are reinforced with carbon fibre, which is created by pyrolyzing synthetic polyester fibres to create lightweight composite materials.
- The black pigment used in printing ink, artist's oil paint, and automobile finishes is carbon black.
- Additionally, carbon is employed for chemical reduction at high temperatures, and the majority of materials used to produce garments, surfaces within buildings, and clothing are composed of carbon compounds.
Physical Properties of Carbon
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Due to its capacity to create several allotropes and interact with other elements, carbon is an element with a diverse spectrum of physical characteristics. Here are a few of carbon's main physical characteristics:
- Carbon can be categorised into various forms, including diamond, which is colourless and transparent, and graphite, which is black and opaque.
- Due to its hexagonal lattice structure, graphite has a lower density than diamond (3.5 g/cm3) and has a lower density than other allotropes of carbon (2.2 g/cm3).
- Both electrical conductivity and resistance are displayed by carbon, with diamond being a superb insulator and graphite being a good conductor
- The melting point of carbon varies depending on its allotrope, with graphite having a melting temperature of 3,370 degrees
- Celsius and diamond having a melting point of 3,550 degrees Celsius.
- At 3,825 degrees Celsius, carbon transforms from a solid to an unphased gas.
- Diamond is the hardest natural substance, scoring 10 on the Mohs scale, with exceptional durability and scratch resistance.
- Graphite, on the other hand, is soft and slippery due to its layered structure.
- Diamond has the best thermal conductivity of any known material due to its strong lattice structure
- Graphite has a high heat conductivity due to its layered structure.
Chemical Properties of Carbon
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The most prevalent element in the universe and the building block of all life is carbon, a non-metal that may be found in Group 14 of the periodic table. It is an amphoteric conductor of electricity and reactive, creating covalent and ionic connections with elements and metals.
- In addition to carbon dioxide, methane, and diamond, carbon may also form other compounds.
- Burning carbon in excess of oxygen produces heat and light. This process is known as carbon combustion.
- Full combustion produces carbon dioxide and water
- Incomplete combustion produces carbon monoxide or carbon and water with a smoky flame and soot due to inadequate oxygen and hydrocarbon excess.
- Oxidation reactions involve the oxidation of carbon and its compounds in the presence of oxygen, but not all combustion reactions.
- Long atom chains are formed by carbon during the addition reaction, turning unsaturated compounds into saturated ones.
- For instance, ethane, a molecule containing a double bond, is produced when heating ethene with a nickel catalyst.
- The substitution reaction is a chemical process where a functional group in a compound is replaced by another.
Things to Remember
- Carbon, a non-metallic chemical element, is a significant element on Earth, forming organic compounds in living bodies and used in technology
- Graphite, a planar structure with three covalent bonds, is a good conductor of electricity and lubricant used in thermal insulation and conduction
- Diamond is the hardest natural mineral.
- Carbon-12, carbon-13, and carbon-14 are common isotopes in carbon samples
- Carbon-12 is the most stable, carbon-13 being heavier and unstable, and carbon-14 being radioactive.
- Carbon atoms can bond to form allotropes, distinct physical forms with similar chemical properties, occurring in the same physical state in two or more crystalline forms.
- Carbon compounds undergo four reactions: combustion, oxidation, addition, and substitution.
- Burning in the air produces carbon dioxide, heat, and light, as seen with methane CH4.
- Carbon compounds in fuels like diesel generate significant heat energy when burned in the air, forming complete and incomplete combustion types.
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Sample Questions
Ques. Define carbon. (3 marks)
Ans. With an atomic number of 6 and the letter C as its symbol, carbon is a chemical element. It is a tetravalent nonmetal with four valence electrons that naturally occurs in a number of allotropes, including graphite and diamond. The fourth most plentiful element in the crust of the Earth, carbon is the fifteenth most abundant element in the universe. It is the cornerstone of organic chemistry and a crucial part of all living things.
Ques. What are isotopes of carbon? (3 marks)
Ans. The carbon isotope ratio (C-13/C-12) measures the proportion of carbon-13 to carbon-12 isotopes, determining the provenance of carbon sources. Organic materials from plants have a lower C-13/C-12 ratio than inorganic materials, while inorganic matter has a larger ratio. The C-13/C-12 ratio can be used to determine the origin of carbon in a sample, with organic samples having a lower ratio and inorganic samples having a higher ratio.
Ques. What are the differences between Graphite and Diamond? (3 marks)
Ans. Graphite is a silky, glossy black material composed of hexagonally organised carbon atoms, while diamond is a highly hard, clear mineral. The primary distinction between the two is their hardness, with diamond being the toughest substance on Earth. Graphite is soft, making fingernails easy to scratch. Its colour, lustre, and density are also distinct. Graphite is black and impenetrable, while diamond is colourless and clear. Graphite has a poor lustre.
Ques. What are the physical properties of carbon? (5 marks)
Ans. Carbon is a versatile element with a wide range of physical properties due to its ability to form various allotropes and bond with other elements.
- It can exist in various forms, from colourless and transparent diamonds to black and opaque graphite.
- The density of carbon varies depending on the allotrope, with diamonds having a density of about 3.5 g/cm3 and graphite having a lower density of around 2.2 g/cm3.
- The melting and boiling points of carbon depend on the allotrope, with diamonds having a high melting point of around 3,550 degrees Celsius and graphite having a lower melting point of around 3,370 degrees Celsius.
- Carbon can exhibit both electrical conductivity and electrical resistance, with graphite being a good conductor of electricity due to its layered structure.
- Diamonds have the highest thermal conductivity of any known material, while graphite has a soft, slippery feel due to its layered structure.
- Carbon is relatively insoluble in common solvents but can dissolve in certain molten metals and supercritical fluids like carbon dioxide.
Ques. What are the chemical properties of carbon? (2 marks)
Ans. Carbon compounds undergo four reactions: combustion, oxidation, addition, and substitution. Carbon, in all forms, requires oxygen, heat, and light to form carbon dioxide. Burning in the air produces carbon dioxide, heat, and light. For example, methane CH4 burns in oxygen, generating carbon dioxide.
Ques. What are the allotropes of carbon? (2 marks)
Ans. Carbon allotropes are made up of different arrangements of carbon atoms. In the same physical state, these different types of carbon can exist in two or more crystalline forms. The most prevalent allotropes are graphite and diamond, with "fullerene" being the purest kind. These allotropes may change light transmission through photometric effects when given the right circumstances, acting as semiconductors, conductors, and superconductors. They do no damage and do nothing.
Ques. What is carbon's significance? (3 marks)
Ans. Carbon is a vital element for life as it forms stable single bonds with itself, allowing it to form long chains and rings of atoms. These atoms form the basis for numerous compounds found in living cells, including DNA. Carbon is abundant in various forms, including carbon dioxide in the atmosphere, carbonates in minerals like limestone, dolomite, gypsum, and marble, and complex organic compounds in living things like plants and animals. Carbon deposits in petroleum, asphalt, and bitumen are formed from the remains of living plants and animals, while carbon and hydrogen are found in natural gas reserves.
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