| Term | Definition |
|---|
| Chemical reactions | The process in which substances undergo chemical changes that results in the formation of new substances. |
| 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 | Two or more substances that are mixed together but not chemically combined. |
| 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 a new substance. |
| Chemical reaction | The process in which substances undergo chemical changes that results in the formation of new substances. |
| Precipitate | A solid that forms from a solution during a chemical reaction. |
| Atom | The smallest particle of an element. |
| Molecule | The combination of two or more atoms. |
| Chemical bond | The force that holds atoms together. |
| Chemical equation | A short, easy way to show chemical reactions, using symbols instead of words. |
| Symbol | A one or two letter set of characters that is used to identify elements. |
| Chemical formula | A combination of symbols that represent the elements in a compound. |
| Subscript | A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound. |
| Reactants | A substance that enters into a chemical reaction. |
| Products | A substance formed as a result of a chemical reaction. |
| Conservation of mass | The principle stating that matter is not created or destroyed during a chemical reaction. |
| 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. |
| Synthesis | A chemical reaction in which two or more simple substances combine to form a new, more complex substance. |
| Decomposition | 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. |
| Exothermic reaction | A reaction that releases energy in the form of heat. |
| Endothermic reaction | A reaction that absorbs energy in the form of heat. |
| Activation energy | The minimum amount of energy that has to be added to get a chemical reaction started. |
| Concentration | The amount of one material in a certain volume of another material. |
| Catalyst | A material that increases the rate of a chemical reaction by lowering the activation energy. |
| Enzyme | A biological catalyst that lowers the activation energy of reactions in cells. |
| Inhibitor | A material that decreases the rate of a reaction. |
| Combustion | A rapid reaction between oxygen and fuel that results in fire. |
| Fuel | A material that releases energy when it burns. |
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