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CHEM: Matter Ch2

matter anything that has mass and volume; it occupies space
atom the smallest unit of an element
compound a substance made of two or more different elements chemically combined at a specific ratio
molecule two or more atoms bonded together that act as a unit
element a substance composed of atoms with the same atomic number
solid phase of matter with definite shape and definite volume
liquid phase of matter with definite volume but no definite shape (takes shape of container)
gas phase of matter with no definite shape and no definite volume
STM Scanning Tunneling Microscope
pure substance a type of matter with the same composition and properties throughout; elements and compounds are pure substances
allotrope two or more different forms of the same element that have different formulas, structures, and properties
physical properties characteristics of a substance that can be observed and measured without changing the chemical composition of the substance
chemical properties characteristics of a substance based on its interaction with another substance
physical change change that does not affect the composition of a substance
chemical change changes the composition matter during a chemical reaction
mixture a physical (not chemical) combination of two or more substances
alloys a homogeneous mixture of a metal with another element (often another metal)
homogeneous mixture a mixture that is uniformly and evenly mixed
heterogeneous mixture a mixture that has different properties in different areas of the substance: not uniformly and not evenly mixed
distillation a method of separating the components of a liquid mixture that depends on different boiling points of the substances
filtration a method of separating the components of a mixture containing a solid and a liquid
Created by: MsRobinG