Deck 5: Solids, Liquids, Phase Transitions, Gaseous State and Bonding in Organic Molecules

Question 1

At 20°C water has a vapor pressure of 0.0231 atm. If you bubble air through a container of water and collect 1 L of it at a total pressure of 1 atm, how many grams of water are in your sample of air (you can assume it is saturated)?

A) 9.6´10^-4
B) 3.0´10^-4
C) 3.0´10^-3
D) 1.1´10^-2
E) 1.7´10^-2

Answer 1

1.7´10^-2

Question 2

Arrange the follow in order of increasing boiling point: H₂O, H₂S, H₂Se, H₂Te

A) H₂O, H₂S, H₂Se, H₂Te
B) H₂Te, H₂Se, H₂S, H₂O
C) H₂O, H₂Te, H₂Se, H₂S
D) H₂S, H₂Se, H₂Te, H₂O
E) H₂S, H₂Se, H₂O, H₂Te

Answer 2

H₂S, H₂Se, H₂Te, H₂O

Question 3

A gas has a temperature of 34.9°C and a volume of 2.8L. It is cooled at constant pressure and the new volume is 2.5 L. What is the new temperature of the gas?

A) 1.89°C
B) 11.6°C
C) 25.2°C
D) 31.2°C
E) 39.1°C

Answer 3

1.89°C

Question 4

The vibration frequency of HCl is 8.66´10¹³ s^-1 and HBr is 7.68´10¹³ s^-1. At 1000 K which molecules will have a larger population in the first excited vibrational state?

A) HCl
B) HBr
C) they will be exactly equal
D) it depends on the force constant of the bond
E) it depends on the total pressure

Question 5

Helium effuses through a small opening at a rate of 1´10^-9 mol s^-1. An unknown gas at the same temperature and pressure is found to effuse through the same opening at a rate of 3.78´10^-10 mol s^-1. What is the molecular mass of the unknown gas?

A) 4 g mol^-1
B) 14 g mol^-1
C) 18 g mol^-1
D) 28 g mol^-1
E) 40 g mol^-1

Question 6

Based on the van der Waals equation of state

Which of the following molecules - hydrogen chloride, nitrogen dioxide, or sulfur dioxide - should behave most like an ideal gas.

A) HCl
B) NO₂
C) SO₂
D) Must know n to answer this question

Question 7

With respect to the Maxwell-Boltzmann probability distribution function of molecular speeds, which of the following is true?

A)

B)

C)

D)

E) A and D

Question 8

Name the following compound.

A) 6,6,6-trimethyl-2-hexyne
B) 5,5,5-trimethyl-2-hexyne
C) 6,6-dimethyl-2-heptyne
D) 1,5,5,5-tetrametyl-1-pentyne
E) 5,5-dimethyl-2-hexyne

Question 9

Which of the following molecules is chiral

A)

B)

C)

D)
E) none of the above

Question 10

Which of the following is a primary amines?

A)

B)

C)

D)

E)