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chemical reaction
science
| Term | Definition |
|---|---|
| chemistry | is the study of the properties of matter and how matter changes |
| element | is a substance that cannot be broken down into any other substance by chemical or physical means |
| compound | is a substance made of two or more elements chemically combined in a specific ration, or proportion |
| mixture | is made from two or more pure substance-elements,compounds,or both-that are in the same place but not combined as a new material |
| 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 |
| 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 |
| moleclue | the combination of two or more atoms |
| chemical bond | the force that holds atoms together |
| 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 a chemical formula which shows the ratio of elements |
| subscript | show the number of atoms of an element in a molecule |
| reactants | the materials you have at the beginning of a chemical reaction |
| products | when the reaction is complete, you have different materials |
| conservation of matter | the principle stating that matter is not created or destroyed during a chemical reaction |
| 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 |
| 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 from of heat |
| endothermic reacton | A reaction that absorbs energy |
| activation energy | is the minimum amount of energy that has to be added to start a reaction |
| concentration | is the amount of one material in a given volume of another material |
| catalyst | is a material that increases the rate of a reaction by lowering the activation energy |
| enzymes | provide a surface on which reactions take place |
| inhibitor | a material used to decrease the rate of a reaction |
| combustion | is a rapid reaction between oxygen and a substance called fuel |
| fuel | is a material that releases energy when it burns |
Created by:
leahpritchett
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