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Unti 5

Balancing chem equat

TermDefinition
Oxidation Number Number of an atom is zero in a neutral substance that contains atoms of only one element
Oxidation-Reduction Reaction Any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron
Reactants A substance that takes part in and undergoes change during a reaction
Products A substance that is present at the end of a chemical reaction
Coefficients A number placed in front of a chemical symbol
Law of Conservation of Mass Mass is neither created nor destroyed in chemical reactions
Combustion Reaction A reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat
Decomposition reaction Processes in which chemical species break up into simpler parts
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 Two ionic compounds that are exchanging anions or cations.
Monatomic ions An ion formed from a single atom
nomenclature the devising or choosing of names for things, especially in a science or other discipline.
oxyanions an ion with the generic formula A. xO z− y
formula mass the sum of the atomic weights of the atoms in the empirical formula of the compound
percent composition tells you by mass what percent of each element is present in a compound
empirical formula the simplest whole number ratio of atoms present in a compound
chemical equation shows the starting compounds, the reactants on the left and the final compounds, the products on the right, separated by an arrow
word equation represents a chemical reaction using the names of the substances involved
formula equation represents the reactants and products of a chemical reaction by their symbols or formulas
reversible reaction a reaction in which the conversion of reactants to products and the conversion of products to reactants occur simultaneously
Created by: tvt
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