BJU Physical Science, Chapter 7, 6th edition

chemical reaction

the process that changes a substance into one or more different substances

precipitate

A solid that forms from a solution during a chemical reaction.

example of a composition change

wood burns and leaves behind ash

chemical equation

a combination of chemical formulas and symbols that models a chemical reaction

Reactants

elements or compounds that enter into a chemical reaction

Products

The elements or compounds produced by a chemical reaction.

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yields

Coefficients

whole numbers that are placed in front of the formulas in an equation in order to balance it

synthesis reaction

a chemical reaction in which two or more substances react to yield a single product

decomposition reaction

a reaction in which a single compound breaks down to form two or more simpler substances

single replacement reaction

a chemical change in which one element replaces a second element in a compound

double replacement reaction

a chemical change that involves an exchange of positive ions between two compounds

combustion reaction

when a substance reacts with oxygen

Oxidation

any instance in which electrons are lost

reduction

gaining of electrons during a chemical reaction

exothermic reaction

a chemical reaction in which heat is released to the surroundings

endothermic reaction

A reaction that absorbs energy in the form of heat

activation energy

Energy needed to get a reaction started

conservation of energy

Energy cannot be created or destroyed