Chemistry Chapter 3 Vocab

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Law of Conservation of Mass
the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes
law of definite proportions
a given compound always contains exactly the same proportion of elements by mass
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
the smallest particle of an element that retains the chemical properties of that element
atomic number
the number of protons in the nucleus of an atom
Atoms of the same element that have different numbers of neutrons
mass number
the sum of the number of neutrons and protons in an atomic nucleus
atomic mass unit
one twelfth the mass of a carbon-12 atom
average atomic mass
the weighted average of the atomic masses of the naturally occurring isotopes of an element
Avogadro's number
number of representative particles in a mole, 6.02 X 10^23
molar mass
the mass of one mole of a pure substance
the SI base unit used to measure the amount of a substance; Avogadro's number of things