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| the science that seeks to understand the behavior of matter by studying the behavior of atoms and molecules |
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| brief statement that summarizes past observations and predicts future ones |
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| a model for the way nature is and tries to explain not merely what nature does but why |
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| anything that occupies space and has mass |
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| energy associated with motion |
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| energy associated with position or composition |
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| energy associated with the temperature of an object |
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| law of conservation of mass |
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| in a chemical reaction, matter is neither created nor destroyed |
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| law of multiple proportions |
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John Dalton
when two elements (A & B) form two different compounds, the masses of element B that combine with 1g of element A can be expressed as a ratio of small whole numbers |
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| the emission of small energetic particles from the core of certain unstable atoms |
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| when the elements are arranged in order of increasing mass, certain sets of properties recur periodically |
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| the value of an element's molar mass in grams per mole is numerically equal to the element's atomic mass in atomic mass units |
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