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DIVE ICP Definitions for Quarterly Exam 1
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DIVE ICP Definitions for Quarterly Exam 1Atom ANSWER - The basic building block of elements consists of electrons within a
nucleus composed of protons and neutrons.
element ANSWER A pure chemical substance composed only of one kind of atom. It
cannot be broken down into simpler substances, by normal scientific methods.
symbols ANSWER - A shorthand way of describing elements by using one or two letters
to identify each.
molecule ANSWER A group of two or more atoms which are chemically bonded
together.
diatomic molecule ANSWER A molecule consisting of two atoms bonded together.
compound ANSWER A substance which consists of two or more different elements
which are chemically combined together
molecular formula ANSWER Provides information as to how many atoms of each
element that are part of a chemical compound.
pure substances A substance wholly made from identical particles. An element consists
of identical atoms and a compound consists of identical molecules.
mixtures Two or more pure substances mixed together, but not chemically bonded.
homogenous mixture A mixture that has a uniform composition.
heterogeneous mixture A mixture in which the different ingredients are identifiable.
colloids - ANSWER A mixture in which one substance made up of very small particles is
dispersed throughout another substance.
, Tyndall effect - ANSWER Light will not be dispersed when passing through a liquid or
solution, but it will be dispersed by the particles suspended in a colloid or suspension.
suspension - ANSWER A heterogeneous mixture, that differs from a solution in that it
contains particles that are not permanently suspended, and will eventually settle out of.
Law of definite proportions - ANSWER A compound is always composed of the same
elements, in the same ratios. A compound's chemical formula does not change.
electrons - ANSWER Particles that are smaller than protons or neutrons, they have a
negative charge.
nucleus - ANSWER The dense central region of an atom, containing the protons and
neutrons.
protons - ANSWER Particles with a positive charge; the number of protons distinguishes
one element from another.
neutrons - ANSWER Particles that have no charge.
energy levels - ANSWER Together they make up the region of an atom in which
electrons are found, each level having electrons with a specific quantity of energy.
quantum model - ANSWER It describes electrons as existing in a cloud, with electrons in
regions of probability called orbitals instead of separate and distinct energy levels.
orbitals - ANSWER The area of an atom that an electron is most likely to be in, given its
amount of energy.
Physical Property - ANSWER Qualities of a substance that can be observed and
measured without changing the identity of the substance.
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