OCR A A2 Chemistry Module 2 Unit 1 Definitions

Definitions from the Key Definition boxes of the OCR A A2 Chemistry textbook.

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  • Created on: 16-01-15 18:28
Preview of OCR A A2 Chemistry Module 2 Unit 1 Definitions

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Unit 1 Rings, polymers and analysis
Module 2 Polymers and synthesis
Peptide - compound made of amino acids linked by peptide bonds. Number of amino acids
indicated by prefix di-, tri- or tetra-
Zwitterion ­ a dipolar ionic form of an amino acid that is formed by the donation of a hydrogen
ion from the carboxyl group to the amino group. Because both charges are present, there is no
overall charge
Isoelectric point ­ the pH value at which the amino acid exists as a zwitterion
Condensation reaction ­ one in which two small molecules react together to form a larger
molecule with the elimination of a small molecule such as water
Hydrolysis ­ involves the breaking of a bond by reaction with water. Hydrolysis can be catalysed
by acid or alkali
Stereoisomers ­ species with the same structural formula but with a different arrangement of the
atoms in space
Chiral carbon ­ a carbon atom attached to four different atoms or groups of atoms
Optical isomers / enantiomers ­ stereoisomers that are non-superimposable mirror images of
each other
Repeat unit ­the specific arrangement of atoms that occurs in the structure over and over again.
Repeat units are included in brackets, outside which is the letter n
Biodegradable polymer ­ a polymer that breaks down completely into carbon dioxide and water
Degradable polymer ­ polymer that breaks down into smaller fragments when exposed to light,
heat or moisture
Pharmacological activity ­ the beneficial or adverse effects of a drug on living matter


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