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19 terms

chemistry 5

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avogadro's number
number of particles in one mole of a substance; 6.02 x 10^23
chemical equation
the statement showing how substances react using chemical formula
compound
two or more substances bonded together through a chemical equation.
amphoteric
a substance that can react like an acid and a base
atom
the fundamental building blocks of matter
atomic mass
the exact mass of an atom
atomic number
the number of protons in an element; defines the element
barometric pressure
the pressure of the atmosphere at a specific location
base
a substance that forms OH- in water or a proton acceptor
chemical equation
the statement showing how substances react using chemical formulas
chemical formula
the symbols and subscripts showing the composition of a compound
chemical properties
characteristics describing how a substance reacts with other substances
covalent bond
a chemical bond where atoms share electrons
density
the mass divided by the volume
enthalpy
the heat energy gained or lost during a chemical reaction
entropy
a measure of the randomness of a reaction
polyatomic ion
an ion composed of more than one element
salt
an ionic compound formed by the reaction of an acid and a base
semimetals
elements that have characteristics of both metals and non-metals