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CHAPTER 6 VOCAB
REVIEW
Physical Science 7th Grade
TERMS:
• Acid rain
• Crystal Lattice
• Atom
• Dissociate
• Atomic Mass
• Dissolve
• Atomic Number
• Element
• Chemical Formula
• Heterogeneous Mixture
• Chemical Symbol
• Homogenous Mixture
• Compound
• Hydrocarbon
• Crystal
• Ion
• Metalloid
• Isotope
• Mixture
• Polar
• Molecule
• Pure Substance
• Periodic Table of Elements
• Solute
• Solution
• Solvent
• Acid Rain-Rain water that has pH
below 7; caused by emissions of
sulfur dioxide, nitrogen oxide, and
other pollutants
• Atom-the smallest part of an
element, composed of a nucleus of
protons and neutrons, surrounded
by an electron cloud.
• Atomic Mass-the average number
of protons and neutrons in the
nucleus of an atom of a particular
element.
• Atomic Number-the number of
protons in the nucleus of an atom of
a particular element.
• Chemical Formula-an expression of
the elements in a compound and
their ratios in which the elements
are denoted by their chemical
symbols.
• Chemical Symbol-the symbol for
one of the 118 elements listed in the
Periodic Table of Elements.
• Compound- two or more elements
chemically bonded together.
• Crystal-the atomic structure of a substance
held together by ionic bonds, characterized
by the orderly arrangement of atoms in a rigid
lattice structure.
• Crystal Lattice-the structural framework in
which atoms are arranged in a crystal.
• Dissociate-when the ions in a crystal lattice
come apart and go into a solution during the
process of dissolving.
• Dissolve-when a solute mixes with a solvent so
that the particles of solute and solvent are
mixed together uniformly all the way down to
the molecular level.
• Element-a substance characterized by atoms
all possessing the same number of protons in
the nucleus.
• Heterogeneous Mixture-a mixture in which the
presence of a t least two different substances
is visible to the eye.
• Homogenous Mixture-a mixture with a
composition that is uniform throughout, all the
way down to the molecular level.
• Hydrocarbon-any molecule consisting of only
hydrogen and carbon atoms, typically fossil
fuels and other compounds derived from
them.
• Ion- a charged atom, it has either gained or
lost an electron.
• Isotope-any variety of the atoms of an
element, differing in the number of neutrons
within its nucleus.
• Metalloid-a group of seven elements in
between the metals and nonmetals.
• Mixture-a combination of substances
that occurs without any chemical
reaction. Substances in the mixture
retain their own properties and may be
physically separated from one another.
• Molecule-a chemically bonded cluster
of atoms.
• Periodic Table of Elements-originally
developed by Dimitri Mendeleev and
ordered by the cycle of the element’s
properties. Now there are 118 elements
that have been discovered and they
ordered by their atomic number.
• Polar-when the electrons in a molecule
are not balanced, so one end or region
of the molecule is more positively
charged and another region is more
negatively charged.
• Pure Substance-an element or a
compound.
• Solute-a solid, liquid, or gas that is to be
dissolved into a fluid.
• Solution-a homogeneous mixture
formed when one substance dissolves
into another substance.
• Solvent-a fluid into which a solute is
dissolved.