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chemistry
Term | Definition |
---|---|
atom | smallest piece of matter that has the same properties of the element that it is in |
proton | a positive subatomic particle in the atoms nucleus. its the identity of the element and atoms number |
neutron | a neutral subatomic particle in the atoms nucleus.... it has no charge and holds most of the mass |
electron | a negative subatomic particle spinning outside the nucleus of an atom. TINY! |
element | the simplest forms of matter that contain only one type of atoms |
periotic table of elements | a chart that organizes all the elements by atomic number and properties |
valence electron | the electron in the outer level of an atom that causes atoms to bond together |
chemical bond | an interaction that holds two atoms together |
electron dot diagram | an easy way to show the valence electrons in an atom or chemical bond |
compound | a set of elements that are chemically bonded and chanegd into new substaces |
chemical formula | a shorthand way to use chemical symbols and number to represent a substance |
subscript | h2o small number to the right of the element that shows how many atoms there are of the element |
coefficent | the large numbers that multiplies atoms of the element 2cl+3na |
chemcal equations | uses symbols to show the realationship between the reactions and the products c+o2->co2 |
decomposition reaction | a reaction where a single compound breaks down to form two simlar substances |
single displacment reaction | one element rerplaces another element in compound leaving a new compound and 1 element |
double displacment reaction | the two metal ions in 2 compounds switch places in a chemical reaction |
indicator | will change colors in the presence of an acid or a bass. |
law of conservation of mass | states that matter is niether created nor destroyed in a chemical reaction |