intro to chem

atom

smallest particle of matter and made up of protons, neutrons, and electrons

element

only made up of one sort of atom

molecule

two or more atoms covalently bonded together

compound

two or more different atoms bonded together

mixture

two or more different elements and/or compounds in the same space which can separated into individual components

acid

substance that donates H⁺ ions

base

substance that accepts H⁺ ions

alkali

base that releases OH⁻ ions in aqueous solutions

salt

formed when H⁺ ions from an acid are replaced by metal or positively charged polyatomic ion with the chemical formula NH₄⁺ ions