CHM1310-001

Fall 2002

Quiz #9

Name (Please print)________________________________

1.(6) SF₄ is a polar molecule while SiF₄ is a nonpolar molecule. Explain this. The way to do this is to draw Lewis structures of these two molecules then determine and compare their electron domain and atomic geometries.

2. A sample of gas occupies a volume of 7.50 liters at 730 mm Hg and 28.0^oC.

(2) a) Calculate the pressure in atmospheres. (760 mm Hg = 1 atm)

(1) b) If the temperature is increased does the volume increase, decrease or remain the same? (constant pressure)

(1) c) If the pressure is increased, does the volume increase, decrease or remain the same? (constant temperature)