题目内容

A chemical system produces 155 kJ of heat and does 22 kJ of work. What is ∆E for the surroundings? ( )

A. 177 kJ
B. -177 kJ
C. 133 kJ
D. -133 kJ

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Which set of three quantum numbers does not specify an orbital in the hydrogen atom? ( )

A. n = 2; l = 1; ml = -1
B. n = 3; l = 3; ml = -2
C. n = 2; l = 0; ml = 0
D. n = 3; l = 2; ml = 2

Which should have the largest difference between the first and second ionization energy? ( )

Al
B. Si
C. P
D. Cl

Which molecule is nonlinear? ( )

A. SO2
B. CO2
C. HCN
D. NO

Calculate the molarity of a solution of 0.556 g PbCl2 in 125 mL of solution. Atomic mass: Pb = 207.2, Cl = 35.5 ( )

A. 4.45 M
B. 0.0160 M
C. 4.45 g/L
D. 1.60 x 10-5 M