Physical Science

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Across
  1. 1. a measure of the concentration of hydrogen ions
  2. 3. a chemical that accepts a hydrogen ion
  3. 5. a chemical that donates a hydrogen ion
  4. 7. on the left side of a chemical equation
  5. 8. when reaction and its reverse act at the same rate
  6. 9. a net release of energy
Down
  1. 1. on the right side of a chemical equation
  2. 2. ______ energy is also known as bond energy
  3. 4. a net absorption of energy
  4. 6. a substance that lowers the activation energy of a chemical reaction