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chemical reactions
science
| Term | Definition |
|---|---|
| chemistry | the study if the properties of 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 ration, 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 | well-mixed mixture |
| physical changes | a change that alters the form or appearance of a material but does not make the material into another substance |
| chemical changes | a change in matter that produces new substances |
| precipitate | a solid that forms form 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 shorter, easier way to show chemical reactions, using symbols instead of words |
| symbol | a one-letter or two-letter symbol that represents most elements |
| chemical formula | a compound that is represented by a"word," shows the ratio of elements in the compound |
| subscirpt | shows the number of atoms of an element in a molecule |
| reactants | materials you have at the beginning of a chemical reaction |
| products | are the different materials you have at the end or finish of a reaction |
| coefficient | a number in front of a chemical formula in the equation |
| synthesis | when two or more substances combined to make a more complex substances |
| decomposition | a reaction that breaks down compounds into simpler products |
| replacement reactions | a reaction in which one element replaces another in a compound or in which two elements different compounds trade places |
| exothermic reaction | a reaction that release 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 |
| inhibitor | a material used to decrease the rate of a reaction |
| combustion | a rapid reaction between oxygen and a substance |
| fuel | a material that releases energy when it burns |
Created by:
tberry1
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