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19 terms

Chapter 5 Vocab

Quiz 12/14/11
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Precipitate
A solid that forms in a solution during a chemical reaction
Endothermic Reaction
A reaction that absorbs energy in the form of heat
Exothermic Reaction
A reaction that releases energy in the form of heat
Chemical Equation
A short, easy, way to show a chemical reaction, using symbols instead of words
Subscripts
A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound
Reactant
A substance that enters into a chemical reaction
Product
A substance formed as a result of a chemical reaction
Conservation of Mass
The principle stating that matter is not created or destroyed during a chemical reaction
Coefficient
A number places in fromt of a chemical formula in an equation that indicates how many atoms or molecules of each reactant and product are involved in a reaction
Synthesis
A chemical reaction in which two or more simple substances combine to form a new, more complex substance
Decomposition
A chemical reaction that breaks down a compound into simpler products
Replacement
A reaction in which one element replaces another in a compound, or in which two elements in different compounds trade places
Activation Energy
The minimum amount of energy needed to start a chemical reaction
Concentration
The amount of one material dissolved in a given amount of another material
Catalyst
A material that increases the rate of a chemical reaction by lowering the activation energy
Enzyme
A biological catalyst that lowers the activation enrgy of reactions in a cell
Inhibitor
A material that decreases the rate of a reaction
Combustion
A rapid reaction between oxygen and fuel that produces thermal energy
Fuel
A material that releases energy when it burns