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Christina's Vocab.

QuestionAnswer
Law of Conservation of Mass the principle that in any closed system subjected to no external forces, the mass is constant irrespective of its changes in form; the principle that matter cannot be created or destroyed.
Physical Change a usually reversible change in the physical properties of a substance, as size or shape
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 one of a class of substances that cannot be separated into simpler substances by chemical means. See also chart under periodic table.
Chemical Formula a representation of a substance using symbols for its constituent elements
Element (Diatomic) Molecule diatomic molecules are molecules composed only of two atoms.
Compound Molecule The smallest particle into which an element or a compound can be divided without changing its chemical and physical properties
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 the action caused by the resistance to another action.
Reactants (of a chemical equation) any substance that undergoes a chemical change in a given reaction.
Products (of a chemical equation) substance that forms as a result of a chemical reacion.
Coefficient (in a chemical equation) A number or symbol multiplied with a variable or an unknown quantity in an algebraic term,
Subscript (in a chemical equation) A distinguishing character or symbol written directly beneath or next to and slightly below a letter or number.
Created by: l0607721
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