Science!

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Across
  1. 3. a substance that cannot be easily broken down into any other substance
  2. 5. a negatively charged particle
  3. 7. a representation of how something works/acts
  4. 8. substances that are made up of only one kind of particle and have a fixed or constant structure
  5. 10. a positively charged particle
  6. 11. denoting a process involving substances in the same phase (solid, liquid, or gaseous).
  7. 12. a substance made by mixing two or more substances together
Down
  1. 1. physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.
  2. 2. of or denoting a process involving substances in different phases (solid, liquid, or gaseous).
  3. 4. an incredibly small particle that makes up almost everything.
  4. 6. a particle with no charge
  5. 9. a thing that is composed of two or more separate elements; a mixture.