chemistry crossword puzzle

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Across
  1. 2. A number in a chemical equation indicating more than one molecule of the substance
  2. 5. The tendency of a substance to interact with itself
  3. 6. The smallest piece of an element that maintains the identity of that element
  4. 9. An ionic compound of the H+ cation dissolved in water
  5. 12. The connection between two atoms in a molecule
  6. 14. ending that is applied that describes the types of chemical bonds in the molecule
  7. 15. A chemical bond formed by two atoms sharing electrons
  8. 17. Bind to the surface of another substance
  9. 18. A physical property defined as a substance’s mass divided by its volume
  10. 19. The characteristic temperature at which a liquid becomes a gas
  11. 20. the unit of temperature scales
  12. 21. A chemical reaction in which a reactant combines with oxygen to produce oxides of all other elements as products
  13. 22. A tiny subatomic particle with a negative charge
Down
  1. 1. Chemical reactions that absorb (or use) energy
  2. 3. The sum of the number of protons and neutrons in a nucleus
  3. 4. A species with an overall negative charge
  4. 5. a combination of more than one elements
  5. 7. the name comes before the molecule
  6. 8. When a chemical reaction happens, energy is transferred to or from the surroundings.
  7. 10. the process of gas becoming a liquid
  8. 11. A gas law that relates number of particles to volume
  9. 13. A condition when the reactants and products of a chemical equation have the same number of atoms of all elements presentcatalyst
  10. 16. A compound that increases the amount of OH− ions in an aqueous solution