Chemical Reactions Terms
AqueousA substance dissolved in water.
Balanced EquationsA description of a chemical reaction that gives the chemical formulas of the reactants and the products of the reaction. Coefficients indicate the number of each molecule present in the reaction. These coefficients can be changed so as not to violate the Law of Conservation of Mass.
CoefficientNumbers inserted before chemical formulas in an equation to ensure that an equation is balanced.
Combustion ReactionA chemical reaction between a fuel and oxygen that produces heat and light as well as carbon dioxide and water.
DecompositionA reaction in which a compound is broken down into simpler compounds or elements.
Double ReplacementAlso known as a metathesis reaction. A reaction in which two reactants trade partners. Here's an example: AB + CD → AC + BD.
ElectrolysisThe process of driving an electrical current through a reaction mixture.
EndothermicA process that absorbs heat.
ExothermicA process that releases heat.
Law Of Conservation Of MassThe law that states there is no change in total mass during a chemical change.
Physical Change (or Physical Reaction)A change that does not transform one substance into another substance, such as freezing or melting. That is to say, no new types of molecules are formed during a physical change.
PrecipitateAn insoluble substance that has been formed after the conclusion of a reaction.
ProductThe compounds that exist after the conclusion of a reaction. It's also the new molecules that are formed as a result of a chemical reaction.
ReactantThe components that exists before a reaction takes place. It's also the molecules present at the start of a reaction that will combine to form the products.
Single ReplacementA reaction in which one component of a compound is replaced by a new component. Here's an example: AB + C → A + BC.
Skeleton EquationAn equation that identifies the reactants and products but the equation is not necessarily balanced.
StoichiometryThe relationship between the relative quantities of atoms or molecules taking part in a reaction or forming a compound.
Synthesis ReactionThe formation of a complex product from simpler reactants. Here's an example: A + B → AB.
Thermal Decomposition ReactionA decomposition reaction initiated by heat.
Word EquationAn equation in pure word form with no elemental symbols or numbers.
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