Physical and chemical change

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Across
  1. 4. to change its state from a liquid to another substance
  2. 7. A chemical reaction is when something can create or produce new chemicals
  3. 9. substance that causes or accelerates a chemical reaction without itself being affected
  4. 12. is expressed in terms of mass per unit
  5. 14. It is a chemical that helps a chemical reaction happen. it is a type of catalyst
Down
  1. 1. when 2 atom are attractive to each other/or remain attractive to each other
  2. 2. When a substance react they could collide or contact each other
  3. 3. A substance that could only be made out of 3 atoms, atom,oxygen,and carbon
  4. 5. A molecule that contains less than 3 and more than 1
  5. 6. when a gas transform into liquid
  6. 8. A substance that is made up with different types of atoms connected together
  7. 10. When the environment does damage to a piece of metal
  8. 11. a certain column situated
  9. 13. It is dangerous gas substance the is really dangerous to breath in