OCR Chemistry F324 Definitions

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  • Created by: huyzie
  • Created on: 18-06-13 16:59
Electrophile
Atom/group of atoms attracted to electron-rich centre, where it accepts a pair of electrons to form covalent bond
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Substitution
Atom/group of atoms replaced with a different atom/group of atoms
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Electrophilic Substitution
Electrophile attracted to electron-rich centre, where it accepts a pair of electrons to form covalent bond
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Reaction Mechanism
Series of steps that make up the overall reaction
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Functional Group
Part of an organic molecule, responsible for chemical reactions
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Electronegativity
Measure of attraction of bonded atom for pair of electrons in covalent bond
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Nucleophile
Atom/group of atoms attracted to electron-rich centre, where it donates a pair of electrons to form covalent bond
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Esterification
Reaction between alcohol with carboxylic acid to produce ester and water
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Low-density Lipoprotein (LDL)
Carries cholesterol and triglycerides from liver to tissues
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High-Density Lipoprotein (HDL)
Removes cholesterol from arteries and transport back to liver
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Peptide
Compound made of amino acids linked by peptide bonds
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Zwitterion
Dipolar ionic form of amino acid formed by donation of hydrogen from carboxyl to amino group. No net overall charge
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Isoelectric Point
pH value at which the amino acid exists as zwitterion
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Condensation Reaction
Two small molecules react together to form a larger molecule with elimination of small molecule such as water
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Stereoisomers
Species with same structural formula, different arrangement of atoms in space
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Chiral Carbon
Carbon atom attached to four different atom/group of atoms
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Optical Isomers (or enantiomers)
Stereoisomers that are non-superimposable mirror images of each other
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Biodegradable Polymer
Polymer that breaks down completely into carbon dioxide and water
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Degradable Polymer
Polymer that breaks down into smaller fragments when exposed to light, heat or moisture
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Phase
Physically distinctive form of a substance such as solid, liquid and gaseous states
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Mobile Phase
Phase that moves in chromatography
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Stationary Phase
Phase that does not move in chromatography
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Adsorption
Process by which a solid holds molecules of gas/liquid/solute as a thin film on surface of solid/liquid (or interacting at surface of a material)
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Absorption
Soaking into a material
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Rf Value
Distance moved by component / Distance moved by solvent front
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Retention Time
Time for component to pass from column inlet to dec
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Other cards in this set

Card 2

Front

Atom/group of atoms replaced with a different atom/group of atoms

Back

Substitution

Card 3

Front

Electrophile attracted to electron-rich centre, where it accepts a pair of electrons to form covalent bond

Back

Preview of the back of card 3

Card 4

Front

Series of steps that make up the overall reaction

Back

Preview of the back of card 4

Card 5

Front

Part of an organic molecule, responsible for chemical reactions

Back

Preview of the back of card 5
View more cards

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