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GED Physical Science

Lesson 3 Chemical Reactions

chemical reaction the atoms or ions of one or more substances, called the reactants, are rearranged, resulting in one or more different substances called the products
reactants any substance that undergoes a chemical change in a given reaction
products a substance obtained from another substance through chemical change
law of conservation of mass A principle which states that matter is neither created or destroyed during a chemical reaction, so the mass of the products always equals the mass of the reactants
chemical equations a symbolic representation showing the kind and amount of the starting materials and products of a reaction
coefficient a number or quantity placed (generally) before and multiplying another quantity, as 3 in the expression 3x
endothermic reaction a reaction in which the reactants absorb energy from their surroundings
exothermic reaction a reaction in which energy is given off with the products, usually in the form of heat or light
activation energy the amount of energy needed to get a reaction going
Created by: jpiittmann