Chemical reactions and Equation

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Across
  1. 2. substances formed as a result of a chemical reaction
  2. 4. groups of atoms bonded together acting as a single unit
  3. 7. a reaction where two or more substances combine to form one product
  4. 8. a reaction where a substance burns in oxygen producing heat and light
  5. 10. a process where reactants change into new substances
  6. 12. compounds formed by sharing electrons between atoms
  7. 13. substances made of metal atoms bonded together
  8. 14. a change that does not alter the substance’s chemical identity
  9. 18. an atom or molecule with a positive or negative charge
  10. 19. categories of reactions based on how substances change
  11. 20. a combination of symbols showing the composition of a substance
Down
  1. 1. a reaction where one element replaces another in a compound
  2. 3. a change that forms new substances with different properties
  3. 5. matter cannot be created or destroyed in a reaction
  4. 6. substances present at the start of a chemical reaction
  5. 9. a compound formed by the transfer of electrons between atoms
  6. 11. a symbolic representation of a chemical reaction using formulas
  7. 15. substances made of two or more elements chemically combined
  8. 16. a reaction where one compound breaks down into simpler substances
  9. 17. an electron in the outermost energy level of an atom