General Chemistry 2 Examination

It is the internal energy that forms due to the motion/vibration of atoms and molecules. It increases when atoms/molecules move faster.

• Chemical Energy

• Potential Energy

• Radiant Energy

• Thermal Energy

The energy change in a chemical reaction is due to the difference in the amounts of stored chemical energy between the products and the reactants. This stored chemical energy, or heat content, of the system, is known as its ________.

• Energy

• Enthalpy

• Entropy

• Equilibrium

It measures a system's thermal energy per unit temperature that is unavailable for doing useful work. Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of a system's molecular disorder, or randomness.

• Energy

• Enthalpy

• Entropy

• Equilibrium

Direction: For numbers 42-51, solve the change in Enthalpy for every reaction using the Enthalpies of Formation listed below. Shade the letter of the correct answer on the answer sheet. (2 points each)

• 429.81 kJ/mol    

•  857.46 kJ/mol

• 429.81 kJ/mol

• -857.46 kJ/mol

This is the time-evolution of a system in which it releases free energy and moves to a lower, more thermodynamically stable energy state (closer to thermodynamic equilibrium).

• Endothermic process

• Exothermic process

• Spontaneous process

• Non-spontaneous process

Which one of the following thermodynamic quantities is not a state function?

• Enthalpy

• Entropy

• Internal Energy

• Work

A well stoppered thermos flask contains some ice cubes. This is an example of _____________.

• Close system

• Isolated system

• Non thermodynamics system

• Open system

This process releases heat, causing the temperature of the immediate surroundings to rise.

• Endothermic process

• Non-spontaneous process

• Exothermic process

• Spontaneous process

A branch of Science study of matter, including its properties, composition as well as reactivity.

• Astronomy

• Biology

• Chemistry

• Physics

The entropy will usually increase when

I. A molecule is broken into two or more smaller molecules.

II. A reaction occurs that results in an increase in the number of moles of gas.

III. A solid changes to a liquid.

IV. A liquid changes to a gas.

• I, II, III only

• IV only

• II, III, IV only

• I, II, III, and IV