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Ch 1.1 Science Vocab
Science Vocabulary Words
| Term | Definition |
|---|---|
| Chemistry | the study of the properties of matter and how matter changes |
| Atom | the smallest particle of an element |
| Precipitate | a solid that forms from a solution during a chemical reaction |
| Reactants | a substance that enters into 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 |
| Concentration | the amount of one material in a certain volume of another material |
| Inhibitor | a material that decreases the rate of a reaction |
| Enzyme | a biological catalyst that lowers the activation energy of reactions in cells |
| Conservation of Mass | the principle stating that matter is not created or destroyed during a chemical reaction |
| Chemical Bond | the force that holds atoms together |
| Synthesis | a chemical reaction in which two or more simple substances combine to form a new, more complex substance |
| Element | a substance that cannot be broken down into any other substance by chemical or physical means |
| Catalyst | a material that increases the rate of a chemical reaction by lowering the activation energy |
| 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 |
| Endothermic Reaction | a reaction that absorbs energy |
| Symbol | a one- or two-letter set of characters that is used to identify elements |
| Activation Energy | the minimum amount of energy that has to be added to get a chemical reaction started |
| Exothermic reaction | a reaction that releases energy in the form of heat |
| Mixture | two or more substances that are mixed together but not chemically combined |
| Products | a substance formed as a result of a chemical reaction |
| Combustion | a rapid reaction between oxygen and fuel that results in fire |
| Molecule | the combination of two or more atoms that are chemically bonded |
| Chemical Reaction | the process in which substances undergo chemical changes that result in the formation of new substances |
| Chemical Formula | a combination of symbols that represent the elements in a compound |
| Chemical Change | a change in matter that produces a new substance |
| Physical Change | a change that alters the form or appearance of a material but does not make the material into another substance |
| Chemical Equation | a short, easy way to show a chemical reaction, using symbols instead of words |
| Decomposition Reaction | a chemical reaction that breaks down compounds into simpler substances |
| Replacement Reaction | a reaction in which one element replaces another element in a compound, or when two elements in different compounds trade places |
| Fuel | a material that releases energy when it is burned |
Created by:
Mrs. Klein
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