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Unit 5
Balancing chemical equations
| Term | Definition |
|---|---|
| Oxidation Number | the number of electrons that must be added to or removed from an atom in a combined state to convert the atom into elemental form. |
| Oxidation-Reduction Reaction | any chemical change in which one species is oxidized (lose electrons) and gains another species is reduced (gains electrons); also called redox reduction |
| Reactants | a substance or molecule that participates in a chemical reaction. |
| Products | a substance that forms in a chemical reaction. |
| Coefficients | a whole small number that appears as a factor in front of a formula in a chemical equation. |
| Law of Conservation of Mass | the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes. |
| Combustion Reaction | the oxidation reaction of an element or compound, in which energy as heat is released . |
| Decomposition reaction | a reaction in which a single compound breaks downs to form two or more simpler substances. |
| synthesis reaction | a reaction in which two or more substances combine to form a new compound. |
| single displacement reaction | a reaction in which one element or radical takes the place of another element or radical in a compound. |
| double displacement reaction | a reaction in which the ions of two compounds exchange places in a aqueous solution to form two new compounds. |
| Monatomic ions | an ion formed from a single atom |
| nomenclature | a naming system |
| oxyanions | a polyatomic ion that contains oxygen |
| formula mass | the sum of the average atomic masses of all atoms represented in the formula of any molecule, formula unit, or ion. |
| percent composition | the percentage by mass of each element in a compound. |
| empirical formula | a chemical formula that shows the composition of a compound in terms of the relative numbers and kinds of atoms in the simplest ratio. |
| chemical equation | a representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products. |
| word equation | an equation in which the reactants and products in a chemical equation are represented by words. |
| formula equation | a representation of the reactants and the products of a chemical equation reaction by their symbols or formulas. |
| reversible reaction | a chemical reaction in which the products re-form the original reactants. |