| A | B |
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| balanced equation | when an equation is balanced, both sides of the equation( products and reactants), equal the same amount |
| unbalanced equation | a chemical equation in which the sum of atoms in the product or products does not equal the sum of atoms in the reactants |
| coefficient | a number placed in front of a chemical formula in an equation that indicates how many atoms or molecules of each reactant and product are involved in a reaction |
| subscript | a number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound |
| law of conservation of matter | matter cannot be created noe destroyed |
| chemical equation | a short, easy way to show a chemical reaction, using symbols instead of words |
| formula | a combination of symbols that shows the ratio of elements in a compound |
| molecular compound | a compound consisting of two or more covalently bonded atoms |
| ionic compound | are the formulas that show the ratio of the different ions present in an ionic bond |
| chemical reaction | a process in which substances undergo chemical changes |
| law on convservation of mass | matter may change form but is neither created nor destroyed in a chemical reaction |
| synthesis | a chemical reaction in which two or more simple substances combine to form a new, more complex substance |
| decomposition | a chemical reaction that breaks down a compound into simpler products |
| replacement | a reaction in which one elements replaces another in a compound, or in which two elements in different compounds trade places |
