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PRACTICE QUIZ KEY COORDINATION CHEMISTRY (20 points)

PRACTICE QUIZ KEY COORDINATION CHEMISTRY (20 points). 1. (2 pts) Draw the color wheel. 2. (2 pts) Diagram crystal field splitting. 3. (2 pts) Bidentate ligand?. a. [Co(NH 3 ) 5 (H 2 O)] 3+ b. [Co(NH 3 ) 4 CO 3 ] + c. [Co(NH 3 ) 4 (NO 2 ) 2 ] + d. [Co(NH 3 ) 5 NO 2 ] 2+.

phyllis-jefferson
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PRACTICE QUIZ KEY COORDINATION CHEMISTRY (20 points)

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  1. PRACTICE QUIZ KEY COORDINATIONCHEMISTRY(20 points)

  2. 1. (2 pts) Draw the color wheel.

  3. 2. (2 pts) Diagram crystal field splitting.

  4. 3. (2 pts) Bidentate ligand? • a. [Co(NH3)5(H2O)]3+ • b. [Co(NH3)4CO3]+ • c. [Co(NH3)4(NO2)2]+ • d. [Co(NH3)5NO2]2+

  5. 4. (1 pt) Cr’s oxidation state? • Complete ion has a -1 charge, thus sum of all oxidation states must equal -1. • Cr + 4(CN) + 2(NH3) = -1 • Cr + 4(-1) + 2(0) = -1 • Cr + (-4) + 0 = -1 • Cr = -1 – (-4) • Cr = +3

  6. 5a. (4 pts) Draw crystal field diagram. • Cr2+ 4s03d4 • "Strong“ field d(z2) _____ d(x2-y2) _____ • “Large“ splitting dxy _____ dxz _____ dyz _____ • 5b. (1pt) How many unpaired? Why? • 4 unpaired electrons. Small (less) splitting: the four electrons would fill the bottom three orbitals first and one of the upper level orbitals next all would be in the up direction spinning together making the molecule paramagnetic

  7. 6. (2 pts) Absorbs which color of light? • a) red • b) orange • c) blue • d) violet

  8. 7. (2 pts) Highest energy light? Why? • [Co(H2O)6]3+ • H2O is a stronger field ligand, causes a larger splittingand absorption of higher energy light.

  9. 8. (2 pts) Dissolves in water to give… • 2 ions • 3 ions • 4 ions • 5 ions

  10. 9. (2 pts) Explain colors. • Al3+ complexes have no e-'s in the d orbitals and filled p orbitals. • No electron transitions occur which involve visible light. • Most transition metal complexes have only partly-filled d orbitals; as visible light is absorbed, these electrons are excited to higher d orbitals.

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