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unit 5
| Question | Answer |
|---|---|
| oxidation number | a number assigned to an element in chemical combination which represents the number of electrons lost, by an atom of that element in the compound. |
| oxidation-reduction reaction | any chemical change in which one species is oxidized and another species is reduced |
| reactants | a substance that takes part in and undergoes change during a reaction |
| products | a substance that forms in a chemical reaction |
| coefficients | A number placed in front of a formula to balance a chemical equation |
| law of conservation of mass | mass is neither created nor destroyed in chemical reactions. |
| combustion reaction | the oxidation reaction of an element or compound in which energy as heat is released |
| decomposition reaction | a chemical reaction in which one reactant breaks down into two or more products. |
| synthesis reaction | reactions that occur when two different atoms or molecules interact to form a different molecule or compound. |
| single displacement reaction | a reaction in which one element is substituted for another element in a compound. |
| double displacement reaction | a type of reaction where part of of one reactant is replaced by part of another reactant |
| monatomic ions | an ion consisting of exactly one atom. |
| nomenclature | a set of rules to generate systematic names for chemical compounds. |
| oxyanions | an anion containing one or more oxygen atoms bonded to another element |
| formula mass | the sum of the average atomic masses of each atom represented in the chemical formula |
| percent composition | the percent by mass of each element in a compound |
| empirical formula | the chemical formula of a compound that gives the proportions of the elements present in the compound but not the actual numbers or arrangement of atoms |
| chemical equation | shows the starting compound(s)—the reactants—on the left and the final compound(s)—the products—on the right, separated by an arrow. |
| word equation | represents a chemical reaction using the names of the substances involved |
| formula equation reversible reaction | In reversible reactions, the reactants and products are never fully consumed; they are each constantly reacting and being produced |
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an398714
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