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Chemistry terms
Chapter 1
| Term | Definition |
|---|---|
| Chemistry | is the study of the properties of the matter and how changes |
| Element | is a substance that cannot be broken down into any other substances by chemical or physical means |
| Compound | is a substance made of two or more elements chemically combined in a specific ratio, or proportion. |
| 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 | 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 |
| Precitate | A solid that forms from solution during a chemical reaction |
| Atom | The smallest particle of an element |
| Molecule | is the combination of 2 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 2 letter |
| Chemical formula | shows the ratio of elements in the compound |
| Subscript | shows 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 reactant is complete |
| Conversation 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 combine to make a more complex substance |
| Decomposition | A reaction that 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 form of heat |
| Endothermic reaction | A reaction that absorbs energy |
| Activation Energy | is the minimum amount of energy that has to be added tp start a reaction |
| Consecration | 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 a fuel |
| Fuel | Is a material that releases energy when it burns |
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