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Unit 3 Section A Vocabulary
Petroleum: What is it?
19
Chemistry
10th Grade
07/20/2012

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Term
hydrocarbons
Definition
a molecule composed only of carbon and hydrogen atoms
Term
distillation
Definition
a process that separates liquid substances based on differences in their boiling points
Term
distillate
Definition
the condensed products of distillation
Term
fractional distillation
Definition
a process of separating a mixture into its components b boiling and condensing the components
Term
fraction
Definition
a.) a mixture of petroleum-based substances with similar boiling points and other properties;
b.) one of the distillate portions collected during distillation
Term
intermolecular forces
Definition
forces of attraction among molecules
Term
carbon chain
Definition
carbon atoms chemically linked to one another, forming a chainlike molecular structure
Term
shells
Definition
energy levels surrounding an atom's nucleus within which one or more electrons reside; outer-shell electrons are commonly called valence electrons
Term
valence electrons
Definition
electrons in the outermost shell of an atom; these relatively loosely held electrons often participate in bonding with other atoms or molecules
Term
covalent bond
Definition
a linkage between two atoms involving the sharing of one pair (single bond), two pairs (double bond), or three pairs (triple bond) of electrons
Term
single covalent bond
Definition
a bond in which two electrons are shared by the two bonded atoms
Term
electron-dot formulas, Lewis structure, Lewis dot structures
Definition
the representation of atoms, ions and molecules where valence-electron dots surround each atom's symbol; it is useful for indicating covalent bonding
Term
structural formula
Definition
a chemical formula showing the arrangement of atoms and covalent bonds in a molecule, in which each electron in a covalent bond is represented by a line between the symbols of two atoms
Term
alkanes
Definition
a hydrocarbon containing only single covalent bonds
Term
tetrahedron
Definition
a regular triangular pyramid; the four bonds of each carbon atom in an alkane point to the covers of a tetrahedron
Term
condensed formulas
Definition
a chemical formula that provides additional information about bonding: for example, the condensed formula for propane, C3H8, is CH3-CH2-CH3 or CH3CH2CH3
Term
straight-chain alkane
Definition
an alkane consisting of molecules in which each carbon atom is linked to no more than two other carbon atoms
Term
branched-chain alkane
Definition
an alkane in which at least one carbon atom is bonded to three or four other carbon atoms
Term
structural isomers
Definition
substances involving rearrangement of atoms or bonds within a molecule bu sharing a common molecular formula
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