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Lecture 23

CHEM1006 Lecture 23: Chem2_23

2 Pages
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Department
Chemistry
Course Code
CHEM1006
Professor
Reeves Valerie

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Lecture 23
The primary function of chemical nomenclature is to
ensure that a spoken or written chemical name leaves no
ambiguity concerning to what chemical compound the
name refers.
Each chemical name should refer to a single substance.
Today, scientists often refer to chemicals by their
common names: for example, water is not often called
dihydrogen oxide.
It is important to be able to recognize and name all
chemicals in a standardized way.
The most widely accepted format for nomenclature has
been established by IUPAC. Molecular compounds are
made when two or more elements share electrons in a
covalent bond to connect the elements.
Typically, non-metals tend to share electrons, make
covalent bonds, and thus, form molecular compounds.
Rules for Naming Molecular Compounds:Remove the
ending of the second element, and add "Ide" just like in
ionic compounds.
When naming molecular compounds prefixes are used to
dictate the number of a given element present in the
compound.
" mono-" indicates one, "Di-" indicates two, "Tri-" is
three, "Tetra-" is four, "Penta-" is five, and "Hexa-" is six,
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Description
Lecture 23 The primary function of chemical nomenclature is to ensure that a spoken or written chemical name leaves no ambiguity concerning to what chemical compound the name refers. Each chemical name should refer to a single substance. Today, scientists often refer to chemicals by their common names: for example, water is not often called dihydrogen oxide. It is important to be able to recognize and name all chemicals in a standardized way. The most widely accepted format for nomenclature has been established by IUPAC. Molecular compounds are made when two or more elements share electrons in a covalent bond to connect the elements. Typically, non-metals tend to share electrons, make covalent bonds, and thus, form molecular compounds. Rules for Naming Molecular Compounds:Remove the ending of the second element, and add "Ide" just like in ionic compounds. When naming molecula
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