A. linear B. bent C. triangular D. pyramidal E. tetrahedral 38. The geometry of

Question

A. linear B. bent C. triangular D. pyramidal E. tetrahedral 38. The geometry of a nitrate ion is best described as: A. linear B. bent C. triangular D. pyramidal E. tetrahedral 39. In which of the following molecules are the individual chemical bonds best described as nonpolar covalent? A. H2O B. F2 C. LiCl D. BrCl E. CH4 40. A gas with an initial volume of 400 mL, a pressure of 400 ton, and a temperature of 21 degree C, is heated to 327 degree C and a pressure of 800 torr. After these changes, what is its volume in mL? A. 100 B. 200 C. 400 D. 800 E. 1600 41. What is the density of neon gas (in g/L) at 750 torr and 15 degree C? A. 0.842 B. 1.05 C. 1.68 D. 1.32 E. 0.952

Explanation / Answer

38). C ,triangular( actually trigonal planar)

39). B, pure covalent bond

40), C , P1V1/T1=P2V2/T2

400*400/300 = 800*V2/600

V2=400 ml

41). A

PV =nRT

(750/760)V=(m/20)*0.821*288

density=m/V=(750/760)*20/(0.0821*288)

density = 0.842g/L

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