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Science chemistry

chemistry the study of the properties of matter and how matter changes
matter anything that takes up space (volume) and has weight (mass)
element a substance made of only one kind of atom that cannot be broken down into other substances
compound a substance made of two or more elements chemically combined in a specific ratio
molecule a combination of two or more atoms
atom the smallest particle of an element
nucleus the central core of an atom containing protons and neutrons
proton a small positively charged particle found in the nucleus of an atom
neutron a small uncharged particle found in the nucleus of an atom
electron a tiny, negatively charged, high-energy particle that orbits the nucleus of an atom
periodic table a worldwide system used for organizing elements into categories based on how they react
atomic number the number of protons in the nucleus of an atom
atomic mass (weight) the average mass of one atom of an element
group (family) elements in the same vertical column of the periodic table
period elements in the same horizontal row
physical change a change that alters the form or appearance of a material but does not make the material into a new subtance
chemical change a change in matter that produces a new substance
symbol a one or two letter set of characters that is used to identify elements
subscript the number in a chemical formula that tells the number of atoms in a molecule or ratio of elements in a compound
chemical formula a combination of symbols that represents the elements in a compound
coefficient the number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction
chemical bond a force that holds atoms together
chemical equation a short, easy way to show chemical reactions using symbols instead of words
law of conservation of mass the principle stating that matter is not created or destroyed during a chemical reaction
mixture two or more substances that are mixed together but not chemically combined
solution a mixture in which a substance is spread evenly throughout another substance
suspension a mixture in which particles can be seen and easily separated by settling or filtration
substance pure matter, always the same in composition
ion an atom or group of atoms that has become electrically charged by gaining or losing an electron
Created by: WSS Science 6