biology crossword

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Across
  1. 4. a material composed of two or more elements or compounds that are physically mixed
  2. 5. smallest unit of most compounds
  3. 7. substance in which the solute dissolves
  4. 10. compounds of carbon, hydrogen, and oxygen atoms
  5. 11. indicates H+ ions in solution
  6. 15. when moving electrons travel about the nuclei of both atoms
  7. 17. macromolecules containing hydrogen, oxygen, nitrogen, carbon, and phosphorus
  8. 18. elements or compounds that enter into a chemical reaction
  9. 19. attraction between molecules of different subtances
  10. 20. attraction between molecules of the same substance
Down
  1. 1. substance consisting entirely of one type of atom
  2. 2. macromolecules that contain nitrogen, carbon hydrogen, and oxygen
  3. 3. weak acids or bases that can react with strong acids or bases
  4. 6. energy needed to start a chemical reaction
  5. 8. Basic unit of matter
  6. 9. compound that produces hydroxide ions in solution
  7. 12. substance formed by the combination of two or more elements
  8. 13. group of biological molecules not soluble in water
  9. 14. single sugar molecules
  10. 16. at center of atom