Ch sounding like k

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Across
  1. 2. A group of singers
  2. 3. A situation of confusion and disorder
  3. 5. The personality and nature of a person
  4. 7. The study of what things are made of
  5. 8. A shiny silver coating that looks like metal
Down
  1. 1. A part of a song which is repeated
  2. 2. A place where you can buy medicines
  3. 3. An adjective to do with chemistry
  4. 4. A group of musical notes played at the same time
  5. 6. A festival celebrated on the 24/25 December