cross word

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Across
  1. 7. elements are found on this
  2. 12. absorbs heat
  3. 13. the nut come of a chemical reaction
  4. 15. on the right side of the periodic table
  5. 16. has to have two nonmetal
  6. 19. also known as atomic number
  7. 20. may change color, produce odor, or release gas.
Down
  1. 1. releases heat
  2. 2. H2O->H2+O2
  3. 3. KBr+AgNO3->AgBr+KNO3
  4. 4. Fe+CuCl->Cu+FeCl
  5. 5. mass / volume
  6. 6. CxHy+O2->CO2+H2O+fire
  7. 8. a subatomic particle in a atom with a negative charge
  8. 9. the starting materials in a chemical reaction that undergoes a chemical change to form a product
  9. 10. has to have a metal and nonmetal
  10. 11. can often be undone
  11. 14. the subatomic particle that circles the outside of the nucleus with a negative charge
  12. 17. A+B->A-B
  13. 18. on the left side of the periodic table