Crossword puzzle maker

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Across
  1. 4. A state of matter characterized by particles arranged in a fixed, regular pattern.
  2. 5. The process by which a substance changes from a liquid to a gas at its boiling point.
  3. 6. Anything that has mass and takes up space.
  4. 9. The mass of a substance per unit volume.
  5. 10. Change: A type of change that results in the formation of new chemical substances.
  6. 12. A state of matter characterized by particles that are close together but can move past one another.
  7. 13. The process by which a substance changes directly from a solid to a gas without passing through the liquid phase.
  8. 15. The basic unit of a chemical element.
Down
  1. 1. A substance formed when two or more chemical elements are chemically bonded together.
  2. 2. A state of matter characterized by particles that are widely dispersed and move randomly.
  3. 3. The capacity to do work or produce heat.
  4. 7. Change: A type of change in which the form of matter is altered but one substance is not transformed into another.
  5. 8. A pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei.
  6. 11. The process by which a substance changes from a solid to a liquid.
  7. 14. A substance containing two or more substances that are not chemically bonded together.