Introduction to Polymers
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Questions and Answers

What type of lipid is primarily stored in solid form at room temperature and is produced only by animals?

  • Waxes
  • Steroids
  • Fats (correct)
  • Oils
  • Which of the following structures describes the three-dimensional form of proteins?

  • Primary structure
  • Tertiary structure (correct)
  • Quaternary structure
  • Secondary structure
  • What is the chief characteristic of unsaturated fatty acids?

  • They contain no carbon-carbon double bonds.
  • They are produced only by animals.
  • They are solid at room temperature.
  • They have multiple double bonds. (correct)
  • Which component is NOT part of a nucleotide in nucleic acids?

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

    What is the defining characteristic of a random copolymer?

    <p>Monomers are randomly ordered. (A)</p> Signup and view all the answers

    Which of the following best defines the quaternary structure of proteins?

    <p>The arrangement of more than one polypeptide chain. (C)</p> Signup and view all the answers

    Which property of polymers measures their ability to expand or contract when heated?

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

    What type of lipid forms a waterproof barrier and is produced from the combination of a long-chain alcohol and a fatty acid?

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

    What is true about the crystalline structure of polymers?

    <p>Higher crystallinity typically leads to increased tensile strength. (C)</p> Signup and view all the answers

    What was significant about Friedrich Wöhler's 1828 experiment?

    <p>He accidentally produced urea from inorganic compounds. (C)</p> Signup and view all the answers

    Which type of biomolecule is primarily responsible for storing and transmitting genetic information?

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

    What is the primary function of lipids in cellular structures?

    <p>Storing energy and acting as a waterproof barrier (D)</p> Signup and view all the answers

    Which level of protein structure involves the folding of the polypeptide chain into a three-dimensional shape?

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

    What type of lipid is primarily used for long-term energy storage in the body?

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

    Which of the following statements about polymers is incorrect?

    <p>All polymers have a regular crystalline structure. (C)</p> Signup and view all the answers

    What is the smallest functional unit of a polymer known as?

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

    Which method is commonly used to convert aniline to acetanilide?

    <p>Acetylation with acetic anhydride (D)</p> Signup and view all the answers

    What is the primary use of acetylene in organic chemistry?

    <p>As a building block in organic synthesis (A)</p> Signup and view all the answers

    What functional groups are present in p-nitroacetanilide?

    <p>Nitro and acetamide groups (D)</p> Signup and view all the answers

    What type of reaction forms dibenzalacetone from aldehydes and ketones?

    <p>Claisen-Schmidt reaction (C)</p> Signup and view all the answers

    Which is true regarding the solubility of dibenzalacetone?

    <p>Insoluble in water but soluble in ethanol (B)</p> Signup and view all the answers

    What intermediate is formed during the coupling reaction to prepare 2-naphthol aniline dye?

    <p>Benzene diazonium chloride (A)</p> Signup and view all the answers

    What is the main industrial application of p-nitroacetanilide?

    <p>Dye synthesis and organic chemical synthesis (B)</p> Signup and view all the answers

    What is the outcome of an aniline reacting with 2-naphthol in the presence of benzene diazonium chloride?

    <p>Production of 2-naphthol aniline dye (A)</p> Signup and view all the answers

    Flashcards

    Organic Chemistry

    The branch of chemistry studying organic compounds' structure, properties, reactions, and preparation.

    Acetylation

    Replacing a hydrogen in a molecule with an acetyl group (CH3CO-).

    Aniline

    An amine compound used to make dyes, and somewhat soluble in water.

    Acetylene

    Fuel and building block in organic synthesis.

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    Claisen-Schmidt Reaction

    Condensation reaction of aldehydes/ketones with aromatic aldehydes to form α,β-unsaturated aldehydes/ketones.

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    Dibenzalacetone or Dibenzylideneacetone

    An unsaturated ketone produced by the Claisen-Schmidt reaction.

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    p-Nitroacetanilide

    Organic compound with nitro and acetamide groups, used in dye and pharmaceutical synthesis.

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    Coupling Reaction (for 2-naphthol aniline dye)

    Forms a dye from aniline and 2-naphthol using a diazonium salt intermediate.

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    Secondary Structure of Proteins

    The pattern formed by portions of an amino acid sequence.

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    Tertiary Structure of Proteins

    The overall three-dimensional shape of a protein.

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    Quarternary Structure of Proteins

    The structure formed when multiple polypeptide chains come together.

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    Lipids

    Organic molecules that are insoluble in water, but soluble in organic solvents.

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    Fatty Acids

    Carboxylic acids with long carbon chains, either saturated or unsaturated.

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    Saturated Fatty Acid

    A fatty acid without any carbon-carbon double bonds.

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    Unsaturated Fatty Acid

    A fatty acid with one or more carbon-carbon double bonds.

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    Steroids

    Lipids with fused ring structures. A key example is cholesterol.

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    Waxes

    Lipids formed from long chain alcohol and fatty acid.

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    Nucleic Acids

    Genetic material made of repeating units called nucleotides.

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    Friedrich Wöhler's Experiment

    Converted an inorganic substance into an organic one, disproving a vital force theory.

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    Thermosets

    Polymers with irreversible chemical processes during curing, creating strong cross-linked chains.

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    Copolymer

    Polymer built using two or more different monomers.

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    Random Copolymer

    Copolymer where monomers are randomly arranged.

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    Alternating Copolymer

    Copolymer with monomers arranged in an alternating pattern.

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    Block Copolymer

    Copolymer with long blocks of a single monomer type.

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    Graft Copolymer

    Copolymer with chains of one monomer type attached to a backbone chain of another.

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    Heat Capacity

    Polymer's ability to insulate against heat flow.

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    Thermal Expansion

    How much a polymer expands or contracts with temperature.

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    Crystallinity

    Extent of polymer chains arranged in regular structure.

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    Permeability

    Tendency of a polymer to let other materials pass through.

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    Elastic Modulus

    Resistance of a polymer to deformation under stress.

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    Tensile Strength

    Force needed to break a polymer in tension.

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    Resilience

    A polymer's resistance to abrasion and wear.

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    Refractive Index

    How much a polymer bends light.

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    Unreactivity

    Resistance of a polymer to chemicals, water, and air.

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    Resistance to Electric Current

    Property of a polymer to not conduct electricity.

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    Biomolecules

    Substances produced by living organisms; monomers linked together.

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    Carbohydrates

    Major source of energy in the body; saccharides (sugars).

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    Study Notes

    Polymers

    • Polymers are materials made of repeating smaller units called monomers.
    • Many biological molecules are polymers.
    • Polymers are classified as thermosetting or thermosoftening.
    • Thermosetting polymers are permanently hardened by heat.
    • Thermosetting polymers cannot be resoftened once cured.
    • Thermosoftening polymers can change shape when heated.

    Polymer Structures

    • Linear polymers have long, straight chains of atoms.
    • Branched polymers have branches attached to their chains.
    • Crosslinked polymers have chains that are linked together to form a 3D network.
    • Networked polymers have heavily cross-linked chains creating a complex 3D network.

    Types of Polymers

    • Polyethylene (PE): A thermoplastic used in many consumer products.
    • Polypropylene (PP): A thermoplastic widely used in packaging and household goods.
    • Polyethylene terephthalate (PET): A thermoplastic widely used in beverage bottles and clothing.
    • Polybutadiene (PBD): A synthetic rubber used in tires and cables
    • Polyisobutylene (PIB): A synthetic rubber with excellent toughness and flexibility.
    • Polypropylene glycidyl ether (PGE): A flexible adhesive polymer used for paints, adhesives, plastics.
    • Polyethylene-co-vinyl acetate (PE-VA): A thermoplastic with excellent flexibility and impact resistance, used in packaging.

    Polymer Properties

    • Heat Capacity: The ability of a polymer to insulate against heat flow.
    • Thermal Expansion: How much a polymer expands or contracts when heated.
    • Crystallinity: The degree to which polymer chains are arranged in a regular structure.
    • Permeability: The tendency of a polymer to allow passage of other materials.
    • Elastic Modulus: A measure of a polymer's resistance to deformation when stressed.
    • Tensile Strength: The force required to break a polymer.
    • Resilience: The ability of a polymer to resist abrasion and wear.
    • Refractive Index: The extent to which the polymer affects light as it passes through it.
    • Unreactivity: How resistant a polymer is to chemicals

    Carbohydrates

    • Carbohydrates are also known as saccharides.
    • Carbohydrates are a major source of energy for the body.
    • Their general formula is (CH₂O)n.
    • Monosaccharides are the simplest sugars.
    • Disaccharides are composed of two monosaccharides.
    • Polysaccharides are composed of many monosaccharides, including starch, glycogen, and cellulose.

    Proteins

    • Proteins are polymers of amino acids.
    • The fundamental elements of protein include H, C, O, and N.
    • Proteins have four levels of structure: primary, secondary, tertiary, and quaternary.
    • Primary Structure is the amino acid sequence.
    • Secondary Structure are patterns of local folding.
    • Tertiary structure is the three-dimensional arrangement of the entire polypeptide chain.
    • Quarternary structure describes how different polypeptides associate with each other.

    Lipids

    • Lipids are a chief source of stored energy in cells.
    • Lipids consists of nearly 3.5% of the whole cell contents.
    • Lipids are insoluble in water but soluble in organic solvents.
    • Lipids are composed primarily of C, H, and O.
    • Common lipids include fatty acids, triglycerides, steroids, and waxes.

    Nucleic Acids

    • Nucleic acids are the genetic material of cells.
    • Composed of repeating monomeric nucleic acids.
    • Each nucleotide consists of a 5-carbon pentose sugar, a phosphate group, and a nitrogenous base.

    Organic Chemistry

    • Organic compounds are compounds that contain carbon.
    • Many elements (particularly hydrogen, oxygen, and nitrogen) are linked by covalent bonds to carbon atoms.

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    Description

    Explore the fascinating world of polymers, their structures, and types in this quiz. Delve into the differences between thermosetting and thermosoftening polymers, and understand their various applications and characteristics. Perfect for students looking to enhance their knowledge of materials science.

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