intro 1

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Across
  1. 4. a substance made by combining two or more than two metals to resist corrosion
  2. 5. a chemical that are used to prevent wastage of food by microbial growth
  3. 6. a person who studies and gains specialization in chemistry
  4. 7. a naturally occurring substances from which metals were extracted
Down
  1. 1. Chemicals that are used to protect the crops from harmful pests
  2. 2. a Scottish scientist who discovered nitrogen
  3. 3. chemical preparations that provide immunity from a disease