Carbon Allotropes and Properties Quiz
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Questions and Answers

What type of crystal structure does diamond have?

  • Octahedral crystals (correct)
  • Hexagonal crystals
  • Tetragonal crystals
  • Cubic crystals

Which of the following is a characteristic property of graphite?

  • Soft and greasy to touch (correct)
  • Transparent with high refractive index
  • Hardest natural substance
  • Insoluble in all solvents

What is the reason graphite conducts electricity?

  • Mobile electrons in its structure (correct)
  • The presence of free protons
  • Formation of covalent bonds
  • It has a high density

Which carbon allotrope occurs naturally in a free state?

<p>Diamond (B)</p> Signup and view all the answers

What is the process called that converts wood to coal?

<p>Carbonization (B)</p> Signup and view all the answers

What unique property gives charcoal its ability as an adsorbent?

<p>Its porous structure (B)</p> Signup and view all the answers

At what temperature does diamond burn in air to produce CO2?

<p>900°C (C)</p> Signup and view all the answers

Which statement about graphite's structure is true?

<p>It consists of flat parallel layers (B)</p> Signup and view all the answers

What occurs when the yellow powdery substance is dissolved in solvents like toluene?

<p>It turns pink. (A)</p> Signup and view all the answers

Which property makes fullerenes particularly useful as lubricants?

<p>They can roll between surfaces. (B)</p> Signup and view all the answers

What type of bonding is primarily found in organic compounds?

<p>Covalent bonding. (D)</p> Signup and view all the answers

Which of the following statements is true regarding the stability of organic compounds compared to inorganic compounds?

<p>Inorganic compounds are more stable to heat. (C)</p> Signup and view all the answers

What characteristic property of carbon allows it to form long chains of compounds?

<p>Catenation. (C)</p> Signup and view all the answers

Which statement regarding the solubility of organic compounds is accurate?

<p>Organic compounds are soluble in organic solvents. (C)</p> Signup and view all the answers

Which factor primarily contributes to the variety of carbon compounds?

<p>The ability to form multiple bonds. (B)</p> Signup and view all the answers

How do organic reactions generally compare to inorganic reactions?

<p>Organic reactions are complicated and slow. (C)</p> Signup and view all the answers

What type of hybridization is associated with trigonal geometry?

<p>sp2 hybridization (C)</p> Signup and view all the answers

Which of the following compounds exhibits isomerism?

<p>C4H10 (B)</p> Signup and view all the answers

What characterizes saturated hydrocarbons?

<p>All carbon-carbon bonds are single bonds. (C)</p> Signup and view all the answers

Unsaturated hydrocarbons can be divided into which two categories?

<p>Alkenes and alkynes (B)</p> Signup and view all the answers

How many bonds does a carbon atom have around it in all carbon compounds?

<p>Four bonds (B)</p> Signup and view all the answers

Saturated hydrocarbons are also known as which type of compounds?

<p>Alkanes (D)</p> Signup and view all the answers

What type of reactions can unsaturated hydrocarbons predominantly undergo?

<p>Addition reactions (A)</p> Signup and view all the answers

Which of these compounds is a product of isomerism?

<p>C5H12 (D)</p> Signup and view all the answers

What is the defining characteristic of members of a homologous series?

<p>They vary in molecular formula by a unit of 'CH2'. (B)</p> Signup and view all the answers

Which functional group is associated with the basic character mentioned in the content?

<p>-NH2 (amino) (D)</p> Signup and view all the answers

What is the general molecular formula for the alkane group?

<p>C_nH_{2n+2} (C)</p> Signup and view all the answers

How do physical properties of homologous series members change?

<p>They change gradually with increasing molecular mass. (C)</p> Signup and view all the answers

What is the simplest member of the hydrocarbon homologous series mentioned?

<p>C1H4 (methane) (D)</p> Signup and view all the answers

What happens to the reactivity of members in a homologous series as the molecular mass increases?

<p>The extent of reactions varies. (B)</p> Signup and view all the answers

Which method is used to prepare members of the alkane group?

<p>Reduction of alkyl halides. (D)</p> Signup and view all the answers

Which of the following statements is true about the members of a homologous series?

<p>They are similar in structure and chemical characteristics. (B)</p> Signup and view all the answers

What is required for a combustible substance to undergo combustion?

<p>A combustible substance, a supporter of combustion, and ignition temperature (B)</p> Signup and view all the answers

Which of the following statements about carbon compounds is true?

<p>Methane produces carbon black when burned in limited air (A)</p> Signup and view all the answers

What type of flame do alkanes produce in ample oxygen conditions?

<p>Blue flame (C)</p> Signup and view all the answers

What occurs during the process of cracking in hydrocarbons?

<p>Hydrocarbons decompose without the presence of air (B)</p> Signup and view all the answers

Which of the following is NOT a product of combustion of carbon compounds?

<p>Chlorine gas (C)</p> Signup and view all the answers

What happens when there is limited supply of oxygen during the combustion of hydrocarbons?

<p>Combustion may produce soot due to incomplete burning (B)</p> Signup and view all the answers

Which of the following substances is considered an ideal fuel?

<p>LPG (A)</p> Signup and view all the answers

What is the role of ignition temperature in the combustion process?

<p>It is the minimum heat required for a substance to catch fire (D)</p> Signup and view all the answers

What is the IUPAC name of acetic acid?

<p>Ethanoic acid (C)</p> Signup and view all the answers

What happens to acetic acid when the temperature falls below 290K?

<p>It solidifies into glacial acetic acid (A)</p> Signup and view all the answers

Which of the following best describes the behavior of acetic acid in polar media?

<p>It ionizes to give hydrogen ions (D)</p> Signup and view all the answers

What type of reaction occurs between acetic acid and strongly electropositive metals?

<p>Metal displacement reaction (C)</p> Signup and view all the answers

What is produced when acetic acid reacts with alcohols in the presence of dehydrating agents?

<p>Esters (D)</p> Signup and view all the answers

What color change does acetic acid cause to blue litmus paper?

<p>It turns red (C)</p> Signup and view all the answers

What gas is liberated when acetic acid reacts with carbonates and bicarbonates?

<p>Carbon dioxide (C)</p> Signup and view all the answers

Which property allows acetic acid to exhibit characteristics of both an alkyl group and an acid?

<p>Presence of an alkyl group and an acid moiety (A)</p> Signup and view all the answers

Flashcards

Diamond

A crystalline form of carbon characterized by its extreme hardness, high refractive index and poor conductivity.

Graphite

A crystalline form of carbon known for its softness, greasiness, and excellent electrical conductivity.

Covalent Bond

A strong chemical bond formed by sharing electrons between two atoms.

Molecular Structure

The spatial arrangement of atoms in a molecule, determining its physical and chemical properties.

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Polar Covalent Bond

A type of covalent bond where electrons are shared unevenly, resulting in a dipole moment.

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Non-Polar Covalent Bond

A type of covalent bond where electrons are shared equally, leading to no overall polarity.

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Carbonization

The process of converting wood into coal under high pressure, temperature, and absence of air.

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Anthracite

A type of coal with the highest carbon content, found naturally and used as a fuel.

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Single Covalent Bond

A type of covalent bond where two carbon atoms share a single pair of electrons.

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Triple Covalent Bond

A type of covalent bond where two carbon atoms share three pairs of electrons.

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Molecular Geometry

The arrangement of atoms in a molecule, influencing its physical and chemical properties.

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Carbon-Carbon Bonding

The unique ability of carbon to form multiple bonds with other carbon atoms.

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Isomers

Compounds with the same molecular formula but different arrangements of atoms.

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Saturated Hydrocarbons

Organic compounds that contain only single bonds between carbon atoms.

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Unsaturated Hydrocarbons

Organic compounds that contain at least one double or triple bond between carbon atoms.

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Addition Reaction

The process of adding hydrogen atoms to an unsaturated hydrocarbon.

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What is the appearance of Fullerene C60 powder?

A yellow powdery substance that turns pink when dissolved in solvents like toluene.

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Why are fullerenes good lubricants?

Fullerenes are known for their ability to roll smoothly between surfaces due to their spherical shape. This characteristic makes them excellent lubricants.

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What makes fullerene compounds unique?

Fullerenes can form alkali compounds, such as A3C60. These compounds exhibit superconductivity at relatively high temperatures, typically within the range of 10-40 Kelvin.

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What is Catenation?

The ability of atoms of an element to link together to form chains of identical atoms.

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Why does carbon exhibit maximum catenation?

Carbon, with its ability to form strong carbon-carbon bonds, exhibits catenation to the greatest extent. This is due to the tetravalency of carbon, which allows it to bond with four other atoms.

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What are organic compounds made of?

Organic compounds are mainly composed of carbon and hydrogen.

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Why do organic compounds have lower melting and boiling points?

Organic compounds generally have low melting and boiling points because they are held together by weaker covalent bonds. This contrast explains why many organic compounds are liquids or gases at room temperature.

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What are the solubility and conductivity properties of organic compounds?

Organic compounds are typically insoluble in water but dissolve readily in organic solvents. They are also poor conductors of electricity.

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Combustion

The process of burning a substance, releasing heat energy, carbon dioxide, and water vapor.

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Combustible Substance

A substance that can be burned, like wood, paper, or gas.

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Supporter of Combustion

A substance that allows another substance to burn, like oxygen in the air.

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Ignition Temperature

The minimum temperature needed to start a fire.

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Proper Combustion

The complete and efficient burning of a fuel, producing maximum heat and minimal waste.

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Calorific Value

A measure of the energy released when a fuel is burned.

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Cracking

The change in a substance's chemical structure when heated to high temperatures, breaking it down into simpler components.

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Carbon Black

A black, sooty substance formed when the supply of oxygen is limited during combustion.

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Homologous Series

A series of organic compounds with similar structures and chemical properties, where each member differs from the next by a CH2 group.

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Functional Group

A functional group is a specific group of atoms within a molecule responsible for its characteristic chemical properties. It's attached to the carbon chain by replacing one or more hydrogen atoms.

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Methane (CH4)

The simplest alkane, with one carbon atom bonded to four hydrogen atoms.

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Alkane Group

A group of hydrocarbons where all carbon atoms are linked by single covalent bonds, represented by the general formula CnH2n+2.

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CH2 Difference

The difference between two consecutive members of a homologous series is one CH2 group.

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Gradual Property Changes

The physical properties of compounds in a homologous series generally change gradually with increasing molecular size.

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What is acetic acid?

Acetic acid is a colorless, pungent-smelling liquid with a corrosive nature, also known as vinegar. It solidifies below 290K forming 'glacial acetic acid'.

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What is the chemical formula for acetic acid?

The chemical formula for acetic acid.

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How does acetic acid react with metals?

Acetic acid can react with metals such as sodium and zinc to form salts called acetates and release hydrogen gas.

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What happens when acetic acid reacts with alcohols?

Acetic acid reacts with alcohols in the presence of dehydrating agents, like concentrated sulphuric acid, producing esters.

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What makes acetic acid acidic?

Acetic acid ionizes in polar solvents, releasing hydrogen ions that give it its acidic characteristic.

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What is the result of dry distillation of acetic acid?

Dry distillation of anhydrous alkali salts of acetic acid with soda lime yields methane.

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How does acetic acid react with bases?

Acetic acid reacts with alkalis, carbonates, and bicarbonates, forming salts and water.

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How can we test for the presence of carboxylic group in a compound?

Acetic acid reacts with carbonates and bicarbonates, releasing carbon dioxide gas, indicated by effervescence.

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Study Notes

Introduction

  • Carbon compounds are crucial in daily life, found in foods, fuels, household items, fabrics, and pharmaceuticals.
  • Hydrocarbons are compounds containing carbon and hydrogen.
  • Organic compounds include hydrocarbons and compounds derived from them.

Bonding in Carbon - The Covalent Bond

  • A covalent bond forms when atoms mutually share electron pairs.
  • Sharing one pair forms a single bond, more than one pair forms multiple bonds (double or triple).
  • Covalent compounds exist as molecules, typically as liquids or gases at room temperature.
  • They generally have low melting and boiling points, and are often insoluble in water.
  • Covalent compounds are poor conductors of electricity in the molten or dissolved state.

Types of Covalent Bonds

  • Single Bond (Hydrogen Molecule): Hydrogen atoms share one electron pair to achieve stable electron configuration.
  • Double Bond (Oxygen Molecule): Oxygen atoms share two pairs of electrons to achieve stable electron configuration.
  • Triple Bond (Nitrogen Molecule): Nitrogen atoms share three pairs of electrons to achieve stable electron configuration.

Allotropes of Carbon

  • Allotropy is the phenomenon where an element exists in different forms.
  • Carbon's allotropes include diamond, graphite, and amorphous forms like coal, charcoal, and lamp black
  • Diamond and graphite differ significantly in their physical properties due to their different structures.

Carbon Compounds

  • Saturated Hydrocarbons: contain only single bonds between carbon atoms
  • Unsaturated Hydrocarbons : contain double or triple bonds between carbon atoms
  • Homologous Series: a series of organic compounds with a similar structure and composition that differ by a -CH2- group.
  • Examples of carbon homologous series include alkanes, alkenes, and alkynes.

Important Carbon Compounds

  • Ethanol: a colorless liquid, used as a solvent and in alcoholic beverages, it reacts with Sodium metal to liberate hydrogen gas and reacts with Phosphorus trichloride to form ethyl chloride and with concentrated sulfuric acid at 170°C to form ethane.
  • Acetic Acid: a colorless liquid (vinegar), used in various industries and reacts with bases to neutralize them.

Classification of Hydrocarbons

  • Open-chain (aliphatic/acyclic)
  • Carbocyclic (alicyclic/aromatic)

Nomenclature of Carbon Compounds

  • Trivial: Common names
  • IUPAC: systematic, universally used names
  • IUPAC naming involves a root (number of carbon atoms), a suffix (type of bonds or functional group), and a prefix (other functional groups and their positions).

Chemical Properties of Carbon Containing Compounds

  • Combustion: reaction in the presence of oxygen forming carbon dioxide and water.
  • Oxidation: reaction with oxygen to form carbon oxides.
  • Addition Reactions: typical of unsaturated hydrocarbons.
  • Substitution Reactions : typical of saturated hydrocarbons.

Soaps and Detergents

  • Both are cleansing agents, but detergents are better at cleaning in hard water.
  • Soap is derived from fats and oils; detergents are synthesized from petroleum.
  • Detergents are often less biodegradable than soap.

Isomerism

  • Isomerism is where compounds have the same molecular formula but different structures and arrangement of atoms.

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Description

Test your knowledge on carbon allotropes such as diamond and graphite. This quiz covers their structures, properties, and the chemical processes related to these unique forms of carbon. Explore characteristics like conductivity, stability, and solubility of organic compounds.

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