Matter

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Across
  1. 2. The amount of matter or substance that makes up an object.
  2. 4. The process when a liquid turns into a solid.
  3. 5. The act of combining.
Down
  1. 1. A state of matter where the gas phase is energized until atomic electrons are no longer associated with any particular atomic nucleus.
  2. 2. To change from a solid to a liquid usually through the action of heat.
  3. 3. Any aspect of a substance which is only seen by means of a chemical reaction.