Exam 1 Study Guide

Exam 1 Study Guide - Matter ~ something that has mass and...

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Matter ~ something that has mass and occupies space Atoms ~ the submicroscopic particles that constitute the fundamental building blocks or ordinary matter Molecules ~ contain two or more atoms joined in specific composition and specific geometrical arrangement Physical changes ~ changes appearances without changing composition Chemical changes ~ chemical reaction Physical properties ~ describe physical attributes Chemical properties ~ describe the way a substance may change to form another substance Pure substance ~ a substance composed of only one type of atom or molecules Element ~ cannot be decomposed into simpler substances (O 2 ) Compounds ~ composed of two or more elements in a fixed ratio (H 2 O) Mixture (impure substance) ~ a substance composed of two or more different types of atoms or molecules that can be combines in variable proportions Homogenous mixtures ~ uniform, also called solutions (vinegar) Heterogeneous mixtures ~ not uniform in a given sample (concrete) Scientific Method ~ an approach to acquiring knowledge about the natural world that begins with observations and leads to the formation of testable hypotheses.
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Exam 1 Study Guide - Matter ~ something that has mass and...

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