chemistry crossword

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Across
  1. 4. Substance composed of atoms with the same number of protons.
  2. 6. Reaction between an acid and a base to form water and a salt.
  3. 7. Representation of a compound showing the actual number of atoms.
  4. 12. Representation of the arrangement of atoms in a molecule.
  5. 13. Definite volume but no definite shape; particles more loosely packed.
  6. 14. Absorbs heat from the surroundings.
  7. 15. Calculation of reactants and products in chemical reactions.
Down
  1. 1. Measure of the average kinetic energy of particles in a substance.
  2. 2. Horizontal row of elements in the periodic table.
  3. 3. Minimum energy required for a reaction to occur.
  4. 5. Bond formed by the sharing of electrons between atoms.
  5. 8. No definite shape or volume; particles move freely.
  6. 9. Substances formed as a result of a chemical reaction.
  7. 10. Definite shape and volume; particles tightly packed.
  8. 11. Substance that changes color to indicate the pH of a solution.