Glossary of physical science chap. 9

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exothermic reaction
a reaction that gives off thermal energy
combination reactions
reactions that combine two or more substances into one or more complex compound
endothermic reaction
a reaction that requires thermal energy
oxidation numbers
symbols that indicate the number of electrons that an element gains or loses as it bonds
a substance (on the right hand side of the equation) that is produced by a chemical change
a number used as a multiplier in measuring the change in some property of the substance
polyatomic ion
a group of several atoms that act as a single charged particle
a decomposition reaction that decomposes the reactants by an electric current in solution
a small number placed beside the symbol of an element in a formula to indicate the number of atoms of that element contained in the compound represented by that formula
chemical formula
a shorthand method of expressing the makeup of a compound (pure substance)
binary compound
a compound that is composed of two different elements
a substance (on the left-hand side of an equation) that undergoes a chemical change
decomposition reactions
reactions that decompose of take apart the formula units or molecules of a substance
chemical equations
describe the changes that take place during a reaction
single replacement reaction
reaction in which one element in an existing compound is replaced by another element
double replacement reactions
reaction in which two ionic compounds swap cations and anions with each other
a solid formed during a reaction; insoluble in water

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