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14 Cards in this Set

  • Front
  • Back
law of conservation of mass
mass is neither created nor destroyed during
ordinary chemical or physical reactions
law of definite proportions
a chemical compound contains the same elements
in exactly the same proportions by mass regardless of the size of the sample or
the source of the compound
law of multiple proportions
if two or more different compounds are
composed of the same two elements, then the ratio of the masses of the second
element combined with a certain mass of the first element is always a ratio of
small whole numbers
atom
the smallest unit of an element that maintains the properties of that
element
nuclear forces
a short-range proton-neutron, proton-proton, or neutron-neutron
force that holds the nuclear particles together
atomic mass unit
a unit of mass that is exactly 1/12 the mass of a carbon-12
atom, or 1.660 540 × 10–27 kg
Avogadro's number
6.022 1367 × 1023; the number of particles in exactly one
mole of a pure substance
mass number
the total number of protons and neutrons in the nucleus of an
isotope
mole
the amount of a substance that contains as many particles as there are
atoms in exactly 12 g of carbon-12
atomic number
the number of protons in the nucleus of each atom of an
element
isotopes
atoms of the same element that have different masses
molar mass
the mass of one mole of a pure substance
nuclide
the general term for any isotope of any element; also another term
for an atom that is identified by the number of protons and neutrons in its
nucleus
average atomic mass
the weighted average of the atomic masses of the
naturally occurring isotopes of an element