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6th grade test

QuestionAnswer
chemistry the study of matter
atoms smallest piece of of a element
nucleus center of a atom
proton positive part of a atom
atomic mass protons+nuetrons
atomic theory what scientists think about atoms
element a substance that contains 1 kind of atom
periodic table of elements the classification system that organizes elements based on the atomic numbers and groups then into the rows and columns based on their chemical and physical pproperties
Mendeleeve invented periodic table
chemical symbol abbreviation for name of element
molecules atoms held together by chemical forces
covalent bond a bond that occurs when atoms share pairs of electrons
acid a compound that forms hydrogen ions when dissolved in water
base a compound that forms hydroxide ions when dissolved in water
pH scale determines the concentration of or the amount of acids and bases in a solution
indicators a substance that changes color when exposed to acid or base solutions
neutralize when acid and bases come in contact with another
salt a compound that forms after a base and acid combine
atomic number the number of protons in a nucleus (also the same as the number of electrons)
chemical reaction a joining of different types of atoms to form new substances
compounds a substance formed when 2 or more different elements join together chemically
the Bohr model based on how atoms act, is a model of the rings of an atom
Created by: joshfox