General Chemistry Fundamentals: Matter, Measurement, Atomic Theory, and Periodic Trends

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Last updated 4:52 AM on 9/30/26
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4 Terms

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Law of Constant Composition

It states that the elemental composition of pure substance never varies.

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Law of Conservation of Mass

The total mass of substances present at the end of a chemical process is the same as the mass of substances present before the process took place.

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Property of matter: physical/ chemical

Physical: can be observed without changing a substance into another substance (boiling point, density, mass, volume (etc). Chemical: Can only be observed when a substance is changed into another substance (Flammability, corrosiveness, reactivity with acid, etc.

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Average atomic mass

Isotopes of an element weighted by their relative abundances. (abundance % in nature x isotopic mass)