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chemistry
science
| Term | Definition |
|---|---|
| chemistry | is the study of the properties of mater and how matter changes |
| elenent | an element is a substance that cannot be broken down into any other substances by chemical or physical means |
| compound | a compound is a substance made of two or more elements chemically combined is a specific ration, or proportion |
| mixture | a mixture is 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 solution is 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 is called a physical change |
| chemical change | a change in matter that produces new substances is called a chemical change |
| precipitate | a solid that forms from solution during a chemical reaction is called s precipitate |
| atom | the smallest particle of an element is an atom |
| molecule | a molecule is the combination of two or more atoms |
| chemical bond | the force that holds atoms together is called a chemical bond |
| chemical equation | a chemical equation is a shorter, easier way to show chemical reactions, using symbols instead of words |
| symbol | most elements are represented by a one letter or two letter symbol |
| chemical formula | a compound is represented by a "word ," called chemical formula which shows the ratio of elements in the compound |
| subscript | a subscript show the number of atoms of an element is a molecule |
| reactants | the materials you have at the beginning of a chemical reaction are reactants |
| products | when the reaction is complete, you have different materials, called the products of the reaction |
| coefficient | a coefficient is 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, the process is called synthesis |
| decomposition | a 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, is called a replacement reaction |
| exothermic reaction | a reaction that releases energy in the form of heat is called an exothermic reaction |
| endothermic reaction | a reaction that absorbs energy is called an endothermic reaction |
| activation reaction | activation reaction is the minimum amount of energy that has to be added to start a reaction |
| concentration | concentration is the amount of one material in a given volume of another material |
| catalyst | a catalyst is a material that increases the rate of a reaction by lowering the activation energy |
| enzymes | enzymes provide a surface on which reactions take place |
| inhibitor | a material used to decrease the rate of a reaction is called an inhibitor |
| combustion | combustion is a rapid reaction between oxygen and a substance called a fuel |
| fuel | a fuel is a material that releases energy when it burns |
Created by:
hailey_23
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