Unit 1: Ecosystems + Polyatomic Ion Crossword

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Across
  1. 4. CaCO3
  2. 6. SO3
  3. 18. H+
  4. 19. C6H12O6
  5. 20. NH3
  6. 22. CO
  7. 23. H
  8. 24. current human population
  9. 26. time it takes for 1/2 of the original mass of a substance to decay
  10. 29. Ca+2
  11. 30. gases that trap heat in the atmosphere
  12. 33. first step in scientific method
  13. 36. chart of elements
  14. 43. HCO3-
  15. 44. NO2
  16. 47. trials are near the correct answer but not necessarily each other
  17. 48. HCL
  18. 49. j-shaped
  19. 50. NaClO
Down
  1. 1. N20
  2. 2. trials are similar to each other but not necessarily the correct answer
  3. 3. last step in scientific method
  4. 5. one of the weakest chemical bonds
  5. 7. improvement in human wellbeing
  6. 8. s-shaped
  7. 9. derived from human resources
  8. 10. NO
  9. 11. second step in scientific method
  10. 12. number of protons
  11. 13. bonds where atoms share electrons
  12. 14. these resources must be used sparingly
  13. 15. love of life
  14. 16. O3
  15. 17. the universal solvent
  16. 21. third step in scientific method
  17. 25. air, water, soil, and land are examples of this
  18. 27. fourth step in scientific method
  19. 28. protons + neutrons
  20. 31. bond formed when atoms have opposite charges
  21. 32. N2
  22. 34. H2SO4
  23. 35. CO2
  24. 37. Cl-
  25. 38. H2CO3
  26. 39. variety and population of species in the area
  27. 40. H2S
  28. 41. NH4+
  29. 42. CH4
  30. 44. HNO3
  31. 45. O2
  32. 46. no control planet to compare this planet to