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Vocabulary Crossword Puzzle

Harris Goldman
Across
A reaction that releases energy in the form of heat
A reaction in which energy is absorbed.
The particle of an atom that is neutral.
Anything that has mass and takes up space.
Smallest unit of matter that retains the identity of the substance.
The particle of an atom with a positive charge.
Down
The study of the properties of matter and how matter changes.
The process of turning from liquid into vapor.
The amount of mass per unit of volume.
The particle of an atom that moves rapidly around the nucleus.