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Chemical Reactions

7th Grade Physical Science

The process in which atoms are rearranged to produce new substances. chemical reactions
A formula that uses chemical symbols and numbers to represent a given substance. chemical formula
An expression that uses symbols to show the relationship between the starting substances and the substances that are produced by a chemical reaction. chemical equation
The substances that participate (start) in a chemical reaction. reactants
The substances formed in a chemical reaction. products
The law that states that matter is neither created nor destroyed in ordinary physical and chemical changes. Law of Conservation of Mass
What is it called when writing a chemical equation and making sure you have the same number of atoms in reactants and products. balancing the equation
A chemical reaction that requires an input of energy by absorbing energy from its surroundings. endothermic reaction
A chemical reaction in which energy is released into its surroundings. exothermic reaction
The law that states that energy cannot be created or destroyed, but can change form. Law of Conservation of Energy
Describes how fast a reaction occurs. Reaction Rates (4 factors that speed up reactions; concentration, surface area, temperature, and presence of a catalyst)