AP Chemistry Ch4 Creation

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Across
  1. 4. three regions of electron density around a central atom in a molecule form a ___ planar geometry.
  2. 8. electrostatic forces of attraction between oppositely charged cations and anions are ___ bonds (i.e. salts)
  3. 12. a collection of rules for naming things; important in science and other situations.
  4. 14. a compound that contains hydrogen, oxygen, and at least one other element.
  5. 15. a pair of electrons not used in bonding.
  6. 17. the tendency of main group atoelectrons enough bonds to obtain eight valence electrons is known as the ___ rule.
  7. 18. also known as bond length
  8. 20. diatomic molecules are ___ covalent bonds
  9. 21. a bond that forms when three elctron pairs are shared by a pair of atoms
  10. 27. a molecule described as a resonance hybrid never possesses an electronic structure described by either resonance form.
  11. 29. six regions of electron density around a central atom in a molecule form an ___ geometry.
  12. 33. a measure of the tendency of an atom to attract electrons to itself.
  13. 34. there are ___ distinct X positions for trigonal bipyramidal electron-pair geometries (axial and equatorial position).
  14. 36. bond ___ is determined by the distance at which the lowest potential energy is achieved.
  15. 37. the (answer) between any two bonds that include a common atom, usually measured in degrees.
  16. 38. compounds containing only two elements; also polyatomic ions and acids
  17. 39. molecules that contain an odd number of electrons are free ____.
  18. 41. covalent bonds have ___ melting are boiling points because they were weaker bonds.
Down
  1. 1. theory that enables us to predict the molecular structure, including approximate bond angles around a central atom, of a molecule from an examination of the number of bonds and lone electron pairs in its Lewis structure.
  2. 2. the ___ moment measures the extent of net charge separation in the polar molecule as a whole.
  3. 3. the most electronegative element.
  4. 5. the attractive forces between ions are ___ meaning they are the same in all directions.
  5. 6. two regions of electron density around a central atom in a molecule form a ___ geometry
  6. 7. molecules formed from elements that have more than four valence orbitals and can share more than four pairs of electrons with other atoms.
  7. 9. HI(aq) ____ acid.
  8. 10. four regions of electron density around a central atom in a molecule form a ___ geometry.
  9. 11. the ___ charge of an atom in a molecule is the hypothetical charge the atom would have if we could redistribute the electrons in the bonds evenly between the atoms.
  10. 13. the concept stating: if two or more Lewis structures with the same arrangement of atoms can be written for a molecule or ion, the actual distribution of electrons is an average of that shown by the various Lewis structures.
  11. 16. a bond that forms when two pairs of electrons are shared between a pair of atoms.
  12. 19. the arrangement of atoms in a molecule or ion is called its molecular ___.
  13. 21. BCl3 is boron ___
  14. 22. one shared pair of electrons is called a ___ bond.
  15. 23. bonds formed between two atoms when both have similar tendencies to attract electrons themselves.
  16. 24. compounds composed of just two elements: a metal and a nonmetal.
  17. 25. ionic compounds are ____ conductors of electricity when dissolved in water.
  18. 26. a quantity having both direction and magnitude.
  19. 28. unequal sharing of electrons forms ___ covalent bonds.
  20. 30. a ___ symbol consists of an elemental symbol surrounded by one dot for each of its valence electrons.
  21. 31. five regions of electron density around a central atom in a molecule form a trigonal ___ geometry.
  22. 32. ionic compounds that contain water molecules as integral components of their crystals
  23. 35. ionic solids have ___ melting and boiling points because the bonds are strong.
  24. 40. a binary compound comprised of hydrogen and one other nonmetallic element.