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Chemical Reaction


Chemistry the study of the properties of matter and how matter changes.
element a substance that cannot be broken down into any other substances by chemical or physical means.
compound a substance made of two or more elements chemically combined in a specific ratio, or proportion.
mixture made from two or more pure substances - elements, compounds, or both - that are in the same place but not combined as a new material.
solution a well-mixed mixture
physical change a change that alters the form or appearance of a material but does not make the material into another substance.
chemical change a change in matter that produces new substances.
precipitate a solid that forms from solution during a chemical reaction.
atom the smallest particle of an element.
molecule a combination of two or more atoms.
chemical bond the force that holds atoms together.
chemical equation a shorter, easier way to show chemical reactions, using symbols instead of words.
symbol a one-letter or two-letter representation of an element.
chemical formula a 'word' representing a compound which shows the ratio of elements in the compound.
subscript shows the number of atoms of an element in a molecule.
reactants the materials you have at the beginning of a chemical reaction
products the different materials formed when a reaction is complete
conservation of matter the principle that matter is not created or destroyed during a chemical reaction.
coefficient a number in front of a chemical formula in the equation.
synthesis when two or more substances (elements or compounds) combine to make a more complex substance.
decomposition reaction breaks down compounds into simpler products.
replacement reaction a reaction in which one element replaces another in a compound or in which two elements in different compounds trade places.
exothermic reaction a reaction that releases energy in the form of heat.
endothermic reaction a reaction that absorbs energy.
activation energy the minimum amount of energy that has to be added to start a reaction.
concentration the amount of one material in a given volume of another material.
catalyst a material that increases the rate of a reaction by lowering the activation energy.
enzymes provide a surface on which reactions take place.
combustion a rapid reaction between oxygen and a substance called a fuel.
fuel a material that releases energy when it burn.
Created by: lhummingbird