PAP Chemistry unit 5
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| bond length | the average distance between two bonded atoms
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| bond energy | the energy required to break the bonds of a chemical compound and form neutral
isolated atoms (usually kJ/mol)
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| chemical bond | attractive force that holds atoms or ions together; mutual electrical attraction
between the nuclei and valence electrons of different atoms that binds the atoms
together
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| chemical formula | representation of substance by a combination of atomic symbols and numerical
subscripts, indicating the relative numbers of atoms of each kind
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| covalent bond | a bond formed when atoms share one or more electrons pairs; usually it involves
only(valence electrons). Bonding between two atoms of the same element is covalent.
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| crystal lattice | orderly arrangement found in ionic crystals in which ions minimize their potential
energy
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| diatomic molecule | a molecule containing only two atoms
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| dipole | a molecule or a part of a molecule that contains both positively and negatively
charged regions; equal and opposite charges separated a short distance
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| dipole-dipole forces | forces of attraction between polar molecules
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| ductility | ability of a substance to be drawn or pulled out into a wire
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| electron-dot configuration | an electron-configuration notation in which only the valence electrons of an atom
of a particular element are shown, indicated by dots placed around the element’s
symbol
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| enthalpy of vaporization | – amount of energy absorbed as heat required to vaporize a specific amount of
metal at a constant pressure; a measure of the metallic bond strength
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| expanded valence | when atoms are surrounded by more than eight electrons due to bonding which
involves electrons in d orbitals as well as in s and p orbitals
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| formula unit | simplest collection of atoms from which an ionic compound’s formula can be
established; the collection of atoms corresponding to an ionic compound’s formula
such that the molar mass of the compound is the same as the mass of 1 mol of
formula units
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| hybrid orbitals | orbitals of equal energy produced by the combination of 2 or more orbitals on the
same atom; have properties to explain the geometry of chemical bonds between
atoms
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| hybridization | the mixing of two or more atomic orbitals of similar energies of the same atom to
produce new orbitals of equal energies; represents the mixing of higher- and lowerenergy
orbitals
to
form
orbitals
of
intermediate
energy
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| hydrogen bond | the intermolecular force occurring when a hydrogen atom that is bonded to a highly
electronegative atom of one molecule is attracted to two unshared electrons of
another molecule
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| intermolecular forces | forces of attraction between molecules
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| ionic bond | chemical bond that results from the electrical attraction between cations and
anions, combined so the overall structure is neutral. In pure ionic bonding, some
atoms completely give up electrons to other atoms
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| ionic compound | a compound composed of ions bound together by electrostatic attraction
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| lattice energy | the energy associated with constructing a crystal lattice relative to the energy of all
constituent atoms separated by infinite distances; the energy released when 1 mol
of an ionic crystalline compound is formed from gaseous ions
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| Lewis Structure | a structural formula in which electrons are represented by dots; dot pairs or dashes
between two atomic symbols represent pairs in covalent bonds
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| London Dispersion Forces | – the intermolecular attraction resulting from the uneven distribution of electrons(caused by the electrons’ constant motion) and the creation of temporary dipoles
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| lone pair | an unshared pair of valence electrons which therefore belong exclusively to one
atom of a covalently bonded pair of atoms
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| malleability | the ability of a substance to be hammered or beaten into a sheet
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| metallic bond | a bond formed by the attraction between positively charged metal ions and the
electrons around them
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| molecular compound | a chemical compound whose simplest units are molecules
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| molecular formula | a chemical formula that shows the number and kinds of atoms in a single molecule,
but not the arrangement of the atoms
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| molecular geometry | 3-d arrangement of a molecule’s atoms in space
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| molecular polarity | uneven distribution of molecular charge
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| molecule | a neutral group of atoms held together by covalent bonds; the smallest particle of a
substance that has all of the chemical properties of that substance
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| multiple bond | a bond in which the atoms share more than one pair of electrons, such as a double
bond or a triple bond
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| non-polar covalent bond | – a covalent bond in which the bonding electrons are equally attracted to both
bonded atoms resulting in a balanced distribution of electrical charge
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| octet rule | chemical compounds tend to from so that each atom, by gaining, losing, or sharing
electrons, has an octet of electrons (8) in its highest occupied energy level
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| polar covalent bond | a covalent bond in which a pair of electrons shared by two atoms is held more
closely by one atom resulting in an uneven distribution of electrical charge
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| polar | describes a molecule in which the positive and negative charges are separated
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| polyatomic ion | a charged group of two or more covalently bonded atoms
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| resonance | the bonding in molecules or ions that cannot be correctly represented by a single
Lewis structure; to indicated resonance, a double-headed arrow is placed between a
molecule’s resonance structures
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| sea of electrons | description of outer electrons in metals indicating their delocalization (they do not
belong to any one atom and can roam freely)
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| single bond | a covalent bond in which two atoms share one pair of electrons
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| structural formula | a formula that indicates the location of the atoms, groups, or ions relative to one
another in a molecule and that indicates the number, kind, arrangement, and
location of chemical bonds but not of unshared pairs of electrons
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| VSEPR Theory | repulsion between the sets of valence-level electrons surround an atom
causes these sets to be oriented as far apart as possible; predicts some molecular
shapes based on the idea that pairs of valence electrons surrounding an atom repel
each other
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