chemical/physical reactions

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Across
  1. 1. something you can touch
  2. 3. an ingredient
  3. 5. the aftermath of something happening
  4. 6. you can do this to paper
  5. 7. you usually put this on fries
Down
  1. 2. a type of gas
  2. 4. a class in school
  3. 5. this happens when metal is exposed to air for to long