Chemistry terms

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Across
  1. 4. the process when oxygen combines with another element
  2. 5. mass per unit volume of a substance
  3. 7. two or more atoms joined together
  4. 9. substance with a pH higher than seven
  5. 10. combination of two or more substances that are not chemically combined
  6. 12. an atomic particle with no electric charge
  7. 13. a compound with a pH of less than 7
  8. 14. negatively charged atomic particle
  9. 16. formed by the reaction of an acid and a base
  10. 17. a metallic mixture of two or more elements
Down
  1. 1. a material that allows the flow of energy such as heat or electricity
  2. 2. positively charged atomic particle
  3. 3. chemical processes as they relate to living organisms
  4. 6. a pure substance made up of two or more elements
  5. 8. pure chemical substance that is made up of one type of atom
  6. 11. an atom's central core
  7. 13. the smallest unit of an element
  8. 15. a substance that speeds up the rate of a chemical reaction