Physical/Chemical Puzzle

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Across
  1. 5. 12 grams of hydrogen + 3 grams of oxygen = 15 grams of this mixture
  2. 10. discovered law of conservation of mass
  3. 12. baking pretzels
  4. 13. sugar and water
Down
  1. 1. golden marshmallow
  2. 2. rotting banana
  3. 3. from snow to snowman
  4. 4. liquid + liquid = solid
  5. 6. milk that turned too hot
  6. 7. medicine tablet + water = ?
  7. 8. both physical and chemical properties change
  8. 9. from trees to chairs
  9. 11. physical changes can be ?
  10. 12. shiny necklace