Glossary of How Matter Changes

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a negatively charged partical in an atom
a positively charged partical in the nucleus of an atom
a particle in the nucleus of an atom that has no electric charge
atomic number
the number of protons in the nucleus of an atom of an element
chemical bond
a force, or link, that holds atoms together in a molecule or in a crystal
radioactive element
an element made up of atoms whose nuclei break down, or decay, into nuclei of other atoms
a compound that turns red lithmus paper blue and that forms an acid when it reacts with an acid
a substance that changes color when mixed with an acid or a base
chemical change
a change in matter that results in new substances with new properties
a compound that turns blue lithmus paper to red and forms a salt when it reacts with a base
an electrically charged atom
the reaction between an acid and a base
nuclear fission
the splitting of the nucleus of an atom, releasing great amounts of energy
a compound consisting of large molecules formed from many smaller, linked molecules
something used or made to represent an object or idea
the dense central part of an atom
Physical change
a change in the size, shape, or state of matter, with no new kind of matter being formed
a compound that can be formed when an acid reacts with a base

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