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Science
science cards
| Term | Definition |
|---|---|
| Chemistry | The study of the property 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. |
| Solution | 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 |
| Precipitate | A solid that forms from solution during a chemical reaction |
| Atom | The smallest particle of an element |
| Molecule | Combination of two or more atoms |
| Chemical Bond | Force that holds atoms together . |
| Chemical Equation | 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 | Shows the ratio of elements in the compound . |
| Subscript | Shows the number of atoms of an element in a molecule |
| Reactants | Materials that you have at the beginning of a chemical reaction |
| Conservation of Matter | Principle stating that matter is not created or destroyed during a chemical reaction . |
| Coefficient | Number in front of a chemical formula in the equation . |
| Synthesis | When two or more substances combine to make a more complex substance . |
| Decomposition | Breaks down compounds into smaller products |
| Replacement Reaction | Reaction in which one element replaces another in a compound or in which two elements in different compounds trade places . |
| Exothermic Reaction | Reaction that releases energy in the form of heat |
| Endothermic Reaction | A reaction that absorbs energy . |
| Activation Energy | Minimum amount of energy that has to be added to start a reaction . |
| Concentration | Amount of one material in a given volume of another material . |
| Catalyst | Material that increases the rate of a reaction by lowering the activation energy . |
| Enzymes | Provide a surface on which reactions take place |
| Inhibitor | Material used to decrease the rate of a reaction . |
| Combustion | Rapid reaction between oxygen and a substance called a fuel |
| Fuel | Material that releases energy when it burns |
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Thatcrazyasian
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