Final Exam: Fall 2017 26. Which is the strongest, on average, intermolecular for

Question

Final Exam: Fall 2017 26. Which is the strongest, on average, intermolecular force that we discussed in class? (A) (B) (C) (D) (E) hydrogen bonding dipole-dipole interactions London dispersion induced dipole interactions none of the above 14 3./1 · 27, what is the electrongroup arrangement and molecular shape for NH? (A) trigonal pyramidal; trigonal pyramidal (B) trigonal pyramidal; tetrahedral (C) trigonal pyramidal; trigonal planar (D) tetrahedral; tetrahedral (E) tetrahedral; trigonal pyramidal 28. Which of the following molecules cannot participate in hydrogen bonding? (A) CHIOH (B) H (C) NH (D) CHOCHs (E) H:0 29. A 1200 mL, sample of helium gas is at a pressure of 350 mmHig and a temperature of 300 K. What volume will this gas sample occupy if the pressure is increased to 700 mmHg and the temperature is increased to 400 K? (A) 450 mL (B) 800 mL(C) 1650 mL (D) 3200 mL (E) 1225 mL 30. A gas has a volume of 5.0 L at a certain pressure. How must the pressure be changed to double the volume of the gas at a constant temperature? (A) The pressure must be doubled. (B) The pressure must be halved. (C) The pressure must be quadrupled (D) The pressure must be lowered, but the relationship is not linear. (E) There is not enough information to decide. 31. What is the frequency of electromagnetic radiation with a wavelength of 530 mm? (c 3.00 x 10 m/s.) (A) 5.7 × 10ss' (B) 1.3x10"s'i (C) 5.7 × 10'si (D) 1.3 x 10"s'E) 3.00 x 1

Explanation / Answer

26.

(A) Hydrogen bonding

27.

(E) Tetrahedral and pyramidal

28.

(D) CH3OCH3

29.

Using the formula,

P1V1/T1 = P2V2/T2

350 * 1200 / 300 = 700 * V2 / 400

V2 = Final Volume of He gas = 800 mL

(B)

30.

P1V2 = P2V2

P * 5.0 = P2 * 10.0

P2 = final pressure = P/2

(B)

31.

frequency = speed of light / wave length

= 3.00 * 108 / (530 * 10-3)

= 5.7 * 108 s-1

(A)

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