Chemical Thermodynamics

Mathematical equation of first law of thermodynamics is

Here U means delta U

• U=q+W

• q=U+W

• W=U+q

• None of these

The symbol for entropy is

• H
• S
• G

A measure of the disorder of a system

• enthalpy
• entropy
• energy
• free energy

An ice cube is placed on a table and begins to melt.  The following conclusion can be made.

• Energy is being absorbed by the table which causes the cube to melt.
• Energy is being transferred from the table to the ice cube.
• Energy is being created by the air and table and making the cube heat up.
• Energy  is being created by the ice cube and is being released to the air

The equation that relates enthalpy, temperature and entropy is

• Hess's Law
• Second Law of Thermodynamics
• Gibbs Free Energy
• Calorimetry

The First Law of Thermodynamics indicates that

• Work is force exerted over a distance.

• Energy is neither created not destroyed.

• An increase in disorder is part of any spontaneous process.

• Work is a state function.

A process which causes a decrease in entropy is

• condensation of steam to form liquid water

• vaporization of liquid water to form steam

• dissociation of solid sodium chloride into aqueous sodium cations and chloride anions

• sublimation of snow to water vapor

• positive

• negative

• zero

• +139 kJ/mol

• -139 kJ/mol

• +0.139 kJ/mol

• -0.139 kJ/mol