Chemistry Chapter 3 Vocab

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Law of Conservation of Mass

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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

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law of definite proportions

a given compound always contains exactly the same proportion of elements by mass

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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

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Atom

the smallest particle of an element that retains the chemical properties of that element

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atomic number

the number of protons in the nucleus of an atom

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Isotope

Atoms of the same element that have different numbers of neutrons

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mass number

the sum of the number of neutrons and protons in an atomic nucleus

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atomic mass unit

one twelfth the mass of a carbon-12 atom

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average atomic mass

the weighted average of the atomic masses of the naturally occurring isotopes of an element

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Avogadro's number

number of representative particles in a mole, 6.02 X 10^23

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molar mass

the mass of one mole of a pure substance

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Mole

the SI base unit used to measure the amount of a substance; Avogadro's number of things

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