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P. 6th Science Vocab

Science vocabulary

Law of Conservation of Mass a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system
Physical Change a change from one state (solid or liquid or gas) to another without a change in chemical composition
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
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
Chemical Formula a representation of a substance using symbols for its constituent elements
Element (Diatomic) Molecule molecules composed only of two atoms, of either the same or different chemical elements
Compound Molecule a compound made of 2 or more nonmetal elements; a compound held together by covalent bonds
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
Chemical Reaction a process that involves changes in the structure and energy content of atoms, molecules, or ions but not their nuclei
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)
Products (in a chemical equation) a substance that is formed as the result of a chemical reaction.
Coefficient (in a chemical equation) the absolute values of the stoichiometric numbers
Subscript (in a chemical equation0 numbers used to tell you how many atoms of an element are present in the equation
Ionic Compound a chemical compound in which ions are held together in a lattice structure by ionic bonds
Covalent Compound a molecule formed by covalent bonds, in which the atoms share one or more pairs of valence electrons
Metallic Compound a compound that contains one or more metal elements
Synthesis The combining of separate elements or substances to form a coherent whole
Decomposition Separation into constituents by chemical reaction
Single Replacement A chemical reaction in which an element replaces one element in a compound
Double Replacement a chemical reaction where two reactant ionic compounds exchange ions to form two new product compounds with the same ions
Created by: g0301219