No Need to Return This Portion to the Instructor or Proctor: These pages WILL NO

Question

No Need to Return This Portion to the Instructor or Proctor: These pages WILL NOT BE 20. In the COClh molecule, carbon is the central atom. Based on the best Lewis structure for COCh what is the formal charge on carbon? A) 0 B) +1 C)-1 D) +2 E) -2 21. Give the molecular geometry and number of electron groups for SF4 A) square planar, 6 electron groups B) square pyramidal, 6 electron groups C) T-shaped, 5 electron groups D) octahedral, 6 electron groups E) seesaw, 5 electron groups 22. A molecule with the formula AX usesto form its bonds A) sp hybrid orbitals B) sp' hybrid orbitals C) sp' hybrid orbitals D) sp'd hybrid orbitals E) sp'd hybrid orbitals 23. 0.300 moles of sodium nitrite are needed for a reaction. The solution is 0.450 M. How many ml are needed? A) 0.667 ml B) 1500 ml C) 1.5 mL D) 667 ml E) 135 mL 24. Identify the acid in citrus fruits A) citric acid B) hydrochloric acid C) carbonic acid D) hydrofluoric acid

Explanation / Answer

20., the answer is A

21. the answer is E, sp3d geometry, shape = seesaw, and 5 electron group

22. the answer is C , sp3 hybrid orbital

23. the answer is D

molarity = no of moles/ volume

volume = no of moles/ molarity = 0.3/0.450 = 0.667 L = 667 mL

24. the answer is A, fruits contain citrus acid

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