| A | B |
|---|
| activation energy | The minimum amount of enery that has to be added to get a chemical reaction started. |
| catalyst | a material that increases the rate of a chemical reaction by lowering the activation energy |
| chemical bond | the force that holds atoms together |
| chemical change | a change in matter that produces a new substance |
| chemical equation | a short, easy way to show chemcial reactions, using symbols instead of words. |
| chemical reaction | the process in which substances undergo chemical changes that results in the formation of new substances |
| chemical formula | a combination of symbols that represent the element in a compound |
| chemisty | the study of the properties of matter and how matter changes |
| 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 |
| combustion | a rapid reaction between oxygen and fuel that results in fire |
| fuel | a material that releases energy when it burns |
| inhibitor | a material that decreases the rate of a reaction |
| mixture | two or more substances that are mixed together but not chemically combined |
| molecule | the combination of two or more atoms |
| physical change | a change that alters the form or appearance of a material but does not make the material into another substance |
| precipitate | a solid that forms from a solution during a chemical reaction |
| product | a substance formed as a result of a chemical reaction |
| reactant | a substance that enters into a chemical reaction |
| replacement reaction | a reaction in which one element replaces another in a compound; or when two elements in defferent compounds trade places |
| solution | a well-mixed mixture |
| subscript | a number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound |
| symbol | a one- or two-letter set of characters that is used to identify elements. |
| synthesis | a chemical reaction in which two or more simple substances combine to form a new, more complex substance |
