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ChemicalInteractions
Chapter one vocabulary.
Term | Definition |
---|---|
Chemistry | The study of the properties of matter and how matter changes |
Element | A substance that cannot be broken down into any other substance by chemical or physical means. |
Compound | A substance made of two or more elements chemically combined in a specific ratio, or proportion |
Mixture | Two or more substances that are mixed together but not chemically combined. |
Solution | 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 a matter that produces a new substance |
Chemical Reaction | The process in which substances undergo chemical change that results in the formation of new substances |
Precipitate | A solid that forms from a 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 short, easy way to show chemical reactions, using symbols instead of words |
Symbol | A one or two letter set of characters that is used to identify elements |
Chemical Formula | A combination of symbols that represent the elements in a compound |
Subscript | A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound |
Reactants | A substance that enters into a chemical reaction |
Products | A substance formed from a chemical reaction |
Conservation of Mass | The principle stating that matter is not created or destroyed during a chemical reaction |
Coefficient | A number in front of the chemical formula in the equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction |
Synthesis | A chemical reaction in which two or more simple substances combine to form a new, more complex substance |
Decomposition | A chemical reaction that breaks down compounds into simpler products |
Replacement Reaction | A reaction in which one element element replaces another in a compound; or when two elements in a different compounds trade places |
Exothermic Reaction | A reaction that releases energy in the form of heat |
Endothermic Reaction | A reaction that absorbs energy in the form of heat |