Shown below is a model of SF_6 having an orientation in which one or more atoms

Question

Shown below is a model of SF_6 having an orientation in which one or more atoms are hidden from view. What is the indicated bond angle? A) 90 degree B) less than 109.5 degree but greater than 90 degree C) less than 120 degree but greater than 109.5 degree D) 120 degree Consider Li^+, F^-, and O^2-. Which ratio should be the largest? A) (radius Li^+)/(radius F^-) B) (radius F^-)/(radius Li^+) C) (radius O^2-)/(radius Li^+) D) (radius Li^+)/(radius O^2-) What is the average speed (actually the root-mean-square speed) of a carbon monoxide molecule at 27 degree C? A) 450 m/s B) 517 m/s C) 412 m/s D) 514 m/s

Explanation / Answer

Q1.

the angle between the atoms shown must be 90°, since the total 360 plane --> 360/4 = 90°

Q2.

the largest radius --> O2-

the shortest radius --> Li+

therefore

choose C

3)

RMS = Sqrt(3RT/MW)

RMS = sqrt(3*8.314*(27+273)/(28*10^-3)) =517 m/s

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