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Science vocabulary

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Question
Answer
Law of Conservation of Mass   a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system  
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Physical Change   a change from one state (solid or liquid or gas) to another without a change in chemical composition  
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Chemical Change   a usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance  
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Element   a process in which one or more substances are changed into one or more different substances. Is composed of atoms that have the same atomic number  
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Chemical Formula   a representation of a substance using symbols for its constituent elements  
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Element (Diatomic) Molecule   molecules composed only of two atoms, of either the same or different chemical elements  
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Compound Molecule   a compound made of 2 or more nonmetal elements; a compound held together by covalent bonds  
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Chemical Equation   a representation of a chemical reaction using symbols of the elements to indicate the amount of substance, usually in moles, of each reactant and product  
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Chemical Reaction   a process that involves changes in the structure and energy content of atoms, molecules, or ions but not their nuclei  
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Reactants (in a chemical equation)   They are on the left side of the equation with an arrow pointing to the substances being formed on the right side of the equation (the products)  
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Products (in a chemical equation)   a substance that is formed as the result of a chemical reaction.  
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Coefficient (in a chemical equation)   the absolute values of the stoichiometric numbers  
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Subscript (in a chemical equation0   numbers used to tell you how many atoms of an element are present in the equation  
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Ionic Compound   a chemical compound in which ions are held together in a lattice structure by ionic bonds  
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Covalent Compound   a molecule formed by covalent bonds, in which the atoms share one or more pairs of valence electrons  
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Metallic Compound   a compound that contains one or more metal elements  
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Synthesis   The combining of separate elements or substances to form a coherent whole  
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Decomposition   Separation into constituents by chemical reaction  
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Single Replacement   A chemical reaction in which an element replaces one element in a compound  
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Double Replacement   a chemical reaction where two reactant ionic compounds exchange ions to form two new product compounds with the same ions  
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