Extra Credit Crossword Puzzle

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Across
  1. 4. One sign of a chemical change is the change in ______ (temp or light)
  2. 9. in a chemical formula, they represent the coefficient (number of particles)
  3. 10. exists in nature in particles made from 2 elements
  4. 11. One sign of a chemical change is the change in ______
  5. 12. a short-hand notation showing the elements present in a substance and the amount of each element
  6. 13. a picture that uses shapes to show what compound or an element looks like
  7. 16. exists in nature in particles made from more than 2 atoms
  8. 18. One sign of a chemical change is the production of ____
  9. 19. a particle made of atoms that are covalently bondedOne sign of a chemical change is the change in ______
  10. 20. Indicates a change has happened and separates the reactants from the products
Down
  1. 1. a minute portion of matter
  2. 2. a substance made from 1 type of atom
  3. 3. the substances that form as a result of the reaction
  4. 5. in a chemical formula, they represent the subscripts (number of atoms per element)
  5. 6. One sign of a chemical change is the formation of a _____
  6. 7. the basic unit of a chemical element
  7. 8. exists in nature in particles made from one element
  8. 14. the substances you start a reaction with
  9. 15. a substance made of 2 or more elements bonded together
  10. 17. in a chemical formula, they represent the element symbols (type of element)