Crossword !

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Across
  1. 2. of attraction in the area of contact between unlike bodies that acts to hold them together.
  2. 4. measure of the acidity or alkalinity of a solution.
  3. 8. least amount of energy required to undergo a chemical reaction.
  4. 9. made up of one oxygen bonded to one hydrogen
  5. 11. of various proteins, as pepsin, originating from living cells and capable of producing certain chemical changes in organic substances by catalytic action, as in digestion.
  6. 13. or denoting a process involving substances in different phases
Down
  1. 1. nucleus of a hydrogen atom separated from its accompanying electron.
  2. 3. when a substance combines with another to form a new substance.
  3. 5. type of chemical bond in which a hydrogen atom that has a covalent link with one of the electronegative atoms (F, N, O) forms an electrostatic link with another electronegative atom in the same or another molecule.
  4. 6. process by which a gas, liquid, or solid is dispersed homogeneously.
  5. 7. or pertaining to a chemical change that is accompanied by a liberation of heat
  6. 10. molecular force between particles within a body or substance that acts to unite them
  7. 12. substance that undergoes a chemical change in a given reaction.