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Chemical Reactions

Chemical Reactions Vocabulary

TermDefinition
physical change a change that alters the form or appearance of a substance but does not change it into another substance
chemical change a change in which one or more substances combine or break apart to form new substances
physical property a characteristic of a substance that can be observed without changing the substance into another substance
chemical property a characteristic of a substance that describes its ability to change into other substances
reactant a substance that enters into a chemical reaction
product a substance formed as a result of a chemical reaction
endothermic reaction a reaction that absorbs energy - the temperature surrounding the reaction decreases
exothermic reaction a reaction that releases energy - the temperature surrounding the reaction increases
precipitate a solid that forms from a solution during a chemical reaction
subscript a number in a chemical formula that tells the number of atoms in a molecule or the ration of elements in a compound
coefficient a number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction
chemical equation a short, easy way to show a chemical reaction, using symbols
law of conservation of mass the principle that the total amount of matter is neither created nor destroyed during any chemical or physical change
open system a system in which matter can enter from or escape to the surroundings
closed system a system in which no matter is allowed to enter or leave
synthesis reaction a chemical reaction in which two or more simple substances combine to form a new, more complex substance
decomposition reaction a chemical reaction that breaks down compounds into simpler products
replacement reaction a reaction in which one element replaces another in a compound or when two elements in different compounds trade places
combustion reaction a reaction in which water and carbon dioxide are the products
evidence of a chemical change color change, formation of a gas, temperature change, and the formation of a precipitate
Created by: djrapp