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Unit 4


Chemical change the formation of a new substance with different properties; cannot be undone by physical means
Chemical formula a representation of a compound in which the elements are represented by their symbols and subscripts represent the number of atoms of each element
Chemical reaction a change caused by the interaction of two or more substances resulting in the formation of new substances
Compound a pure substance made by chemically combining two or more elements
Element a pure substance that cannot be broken down chemically into simpler substances
Physical change change which alters the physical properties of a substance without changing its identity
Precipitate the solid that is formed as a result of a precipitation reaction
Subscript the number written to the right and slightly below an element in a chemical formula; represents the number of atoms of an element present in a chemical formula
Evidence facts or information indicating whether a belief or proposition is true or valid.
Physical properties a characteristic of matter that may be observed and measured without changing the chemical identity of a sample.
Created by: Turnerr