Chemistry

123456789
Across
  1. 3. The energy required to remove an electron from an atom in the gas phase.
  2. 5. A reaction that releases energy in the form of heat.
  3. 7. The study of matter and its changes.
  4. 8. The smallest particle of an element that retains its identity in a chemical reaction.
  5. 9. The number of atoms of each element in a compound.
Down
  1. 1. A process by which a solid forms and separates from a solution.
  2. 2. The SI unit of amount of substance.
  3. 4. A substance that speeds up a chemical reaction without being consumed.
  4. 6. A type of bond where electrons are shared between atoms.