Puzzle

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Across
  1. 3. Shy, quiet
  2. 5. Organ that regulates chemical levels in blood
  3. 7. Passionate, driven
  4. 9. blending atomic orbitals
  5. 10. State with no change in motion
  6. 11. A rectangular array of numbers
Down
  1. 1. Change in momentum
  2. 2. Concerned with beauty
  3. 4. Body's main source of energy
  4. 6. An accent or dialect
  5. 8. non-invertible matrix