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Compounds

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Term
Definition
Chemical change   the formation of a new substance with different properties; cannot be undone by physical means  
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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  
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Chemical reaction   a change caused by the interaction of two or more substances resulting in the formation of new substances  
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Compound   a pure substance made by chemically combining two or more elements  
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Element   a pure substance that cannot be broken down chemically into simpler substances  
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Physical change   change which alters the physical properties of a substance without changing its identity  
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Precipitate   the solid that is formed as a result of a precipitation reaction  
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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  
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Evidence   facts or information indicating whether a belief or proposition is true or valid.  
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Physical properties   a characteristic of matter that may be observed and measured without changing the chemical identity of a sample.  
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