Exam 5 Test Review

The thermodynamic quality used to describe the degree of disorder in a system is:

• entropy

• internal energy

• enthalpy

• Gibbs Free Energy

Which of the following scenarios represents a DECREASE in the entropy of a system?

• Dissolution of solid KCl in water

• Mixing of two gasses in one container

• Boiling water to become steam

• Freezing water to form ice

Which of the following represents the CORRECT formula for ∆G?

• ∆G= T - ∆H∆S

• ∆G= ∆S - T∆H

• ∆G= ∆H - T∆S

• ∆G= T∆H - S

Which statement is true regarding the sublimation of dry ice (solid CO₂)?

• 1. ΔH is positive, ΔS is positive, and ΔG is positive at low temperature and negative at high temperature.

• 1. ΔH is negative, ΔS is negative, and ΔG is negative at low temperature and positive at high temperature.

• 1. ΔH is negative, ΔS is positive, and ΔG is negative at all temperatures.

• 1. ΔH is positive, ΔS is negative, and ΔG is positive at all temperatures.

Which of the following statements is FALSE according to the Kinetic Molecular Theory?

• The size of a particle is negligibly small.

• The average kinetic energy of a particle is proportional to the temperature in Kelvins.

• The velocity of a particle is proportional to the temperature in Kelvins.

• The collision of one particle with another (or the walls of its container) is completely elastic.

Which of the following is NOT true about diffusion?

• It represents the process by which gas particles spread out in response to a concentration gradient.

• Heavier molecules diffuse more slowly than lighter ones.

• Diffusion is a spontaneous process.

• Diffusion is a nonspontaneous process.

The following diagram best represents:

• Diffusion

• Effusion

• Kinetic Molecular Theory

• Gibbs Free Energy

Which of the following is NOT a unit used to measure pressure?

• Atmospheres (atm)

• Pascals (Pa)

• Mm of mercury (mm Hg)

• All are valid units of pressure

Arrange these gasses in order of increasing density at a standard temperature and density (STP). Ne, Cl₂, F₂, O_2.

• Cl₂ < F₂ < O₂ < Ne

• Ne < O₂ < F₂ < Cl₂

• F₂ < Ne < O₂ < Cl₂

• O₂ < Ne < F₂ < Cl₂

Which is true of spontaneous processes?

• Spontaneous reactions will not occur naturally.

• A spontaneous reaction is also spontaneous in the reverse direction.

• A spontaneous process is one that continues on its own once begun.

• A spontaneous reaction has a positive ∆G.