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Chapter 14
Chemical Reactions
Term | Definition |
---|---|
Chemical reaction | The process by which one or more substances change to produce one or more different substance. |
Precipitate | A solid that is produced as a result of a chemical reaction in solution. |
Chemical Bond | A force that holds two atoms together in a molecule. |
Chemical Formula | A combination of symbols and numbers to represent a substance (ie H2O = water or C6H12O6 = sugar). |
Prefixes: di and bi | Prefix that means 2 |
Prefix: mono | Prefix that means 1 |
Prefix: Poly | Prefix that means many |
Chemical equation | A representation of a chemical reaction that uses symbols to show the relationship between reactants and products. |
Reactant | A substance or molecule that participates in a chemical reaction. |
Product | The substance that forms in a chemical reaction. |
Law of conservation of mass | The law that states that mass cannot be created or destroyed in ordinary chemical and physical changes. |
Coefficient | A number that is placed in front of a chemical symbol or formula (ie 2CO = 2 Carbon Dioxides. |
Synthesis reaction | A reaction in which two or more substances combine to form a new compound. A reaction that makes something new. (A + B --> AB). |
Decomposition reaction | A reaction in which a single compound breaks down to form two or more simpler substances. A reactions where something breaks into separate parts (AB --> A + B). |
Single-displacement reaction | A reaction in which one element takes the place of another element in a compound. One atom kicks out another and takes its place in the relationship (AB + C --> AC + B) C takes the place of B. |
Double-displacement reaction | A reaction in which elements from two separate compounds switch places. (AB + CD --> AC + BD) Both groups swapped partners). |
Exothermic reaction | A chemical reaction in which energy is given off (ie a glow stick. |
Endothermic reaction | A chemical reaction in which energy is taken in. (ie the ice packs where you have to break something in the bag) |
Law of conservation of energy | The law that states that energy cannot be created or destroyed but can change forms. |
Activation energy | The minimum amount of energy required to start a chemical reaction. |
Inhibitor | A substance that slows down or stops a chemical reaction. |
Catalyst | A substance that lowers the activation energy needed for a reaction to occur (ie enzymes). |
Ionic Bond | Bond made when atoms gain or lose electrons. |
Covalent Bond | Bond made when atoms share electrons. |
Ion | An atom that has gained or lost an electron and has a + or - charge. |