CRChemistry1Chapter3Vocabulary
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| mass is not created or destroyed during ordinary chemical reactions or physical changes | Law of Conservation of Mass
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| compounds contain the same elements in the same proportions by mass regardless of the size of the sample or source of the compound | Law of Definite Proportions
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| when 2 or more different compounds are made of the same 2 elements, the ratio of the masses of the 2nd element combined with a certain mass of the 1st element is always a ratio of small whole numbers | Law of Multiple Proportions
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| smallest part of an element that retains all the properties of that element | atom
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| short-range proton-neutron, proton-proton, and neutron-neutron forces that hold the nuclear particles together | nuclear forces
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| 1/12 the mass of a carbon-12 atom | atomic mass unit, amu
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| the number of p+ in the nucleus of each atom of that element | atomic number
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| average of all the atomic masses of the naturally-occurring isotopes of an element | average atomic mass
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| the # of particles in exactly 1 mole of a pure substance | Avogadro's number
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| atoms of the same element that have different masses | isotopes
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| total number of p+ plus no in the nucleus of an isotope | mass number
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| mass of 1 mole of a pure substance | molar mass
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| amount of a substance that has as many particles as there are atoms in exactly 12g of carbon-12 | mole
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| general term that refers to any isotope of any element | nuclide
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