Question 1

Select the correct statement of a law of thermodynamics.

Accepted Answer

A)  The enthalpy of the universe is constantly increasing. 
B)  The entropy of the universe is constant. 
C)  The entropy of an element in its standard state at 25°C is zero. 
D)  Every spontaneous process is accompanied by an increase in total entropy. 
E)  Every spontaneous process is accompanied by a decrease in the enthalpy of the system. 
A)  The enthalpy of the universe is constantly increasing. 
B)  The entropy of the universe is constant. 
C)  The entropy of an element in its standard state at 25°C is zero. 
D)  Every spontaneous process is accompanied by an increase in total entropy. 
E)  Every spontaneous process is accompanied by a decrease in the enthalpy of the system.

Question 2

The term microstate refers to the energy state of a single molecule in a system of many molecules.

Accepted Answer

A) True 
 B)False

Question 3

The higher the pressure of a gas sample, the greater is its entropy.

Accepted Answer

A) True 
 B)False

Question 4

In which one of these pairs will the entropy of the first substance be greater than that of the second? Assume P and T are the same for each pair, unless stated otherwise.

Accepted Answer

A)  1 mole of F2(g); 1 mole of Cl2(g) 
B)  1 mole of I2(s); 1 mole of I2(g) 
C)  1 mole of CaCO3(s); 1 mole of CaO(s) plus 1 mole of CO2(g) 
D)  1 mole of H2(g) at 25°C; 1 mole of H2(g) at 50°C 
E)  1 mole of O3(g); 1 mole of O2(g) 
A)  1 mole of F2(g); 1 mole of Cl2(g) 
B)  1 mole of I2(s); 1 mole of I2(g) 
C)  1 mole of CaCO3(s); 1 mole of CaO(s) plus 1 mole of CO2(g) 
D)  1 mole of H2(g) at 25°C; 1 mole of H2(g) at 50°C 
E)  1 mole of O3(g); 1 mole of O2(g)

Select the correct statement of a law of thermodynamics.

The term microstate refers to the energy state of a single molecule in a system of many molecules.

The higher the pressure of a gas sample, the greater is its entropy.

In which one of these pairs will the entropy of the first substance be greater than that of the second? Assume P and T are the same for each pair, unless stated otherwise.

Keys to Studying Chemistry Definitions, Units, and Problem Solving

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces Liquids, Solids, and Phase Changes

The Properties of Mixtures Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics Rates and Mechanisms of Chemical Reactions

Equilibrium the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Electrochemistry Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Exam 20: Thermodynamics Entropy, Free Energy, and Reaction Direction

Select the correct statement of a law of thermodynamics.

The term microstate refers to the energy state of a single molecule in a system of many molecules.

The higher the pressure of a gas sample, the greater is its entropy.

In which one of these pairs will the entropy of the first substance be greater than that of the second? Assume P and T are the same for each pair, unless stated otherwise.

Keys to Studying Chemistry Definitions, Units, and Problem Solving

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces Liquids, Solids, and Phase Changes

The Properties of Mixtures Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics Rates and Mechanisms of Chemical Reactions

Equilibrium the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Electrochemistry Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters