Thermodynamics, Kinetics and Equilibrium

Which of the following is the correct definition of entropy?

• equal to the internal energy of the system plus the product of pressure and volume

• the degree of disorder or randomness in the system.

• accompanied by or requiring the absorption of heat

• accompanied by the release of heat.

Which of the following best describes Le Chatelier's Principle?

• states that energy can neither be created nor destroyed

• a thermodynamic quantity equivalent to the total heat content of a system.

• a thermodynamic quantity representing the thermal energy in the system

• a change in pressure, temperature or concentration of a reactant applied to a system in equilibrium will shift to counteract the effect of the change.

Choose all of the following that affect the rate of reactions?

• surface area

• temperature

• concentration

• None of the answers affect rate of reaction

For the reaction: Which direction would the chemical reaction flow if the pressure is increased?

• right

• left

Which of the following definitions best describes enthalpy?

• a change in pressure, temperature, or concentration of a reactant

• the heat energy of the system.

• the degree of disorder or randomness in the system.

• states that energy can neither be created nor destroyed

For the following reaction: Which direction would the chemical reaction flow if H2 is removed?

• right

• left

Use the potential energy diagram below to answer the following question: What type of reaction is shown?

• endothermic

• exothermic

Use the potential energy diagram below to answer the following question: What is the heat content of the reactants?

• 40 kj

• 10 kj

• 60 kj

• 20 kj

Use the potential energy diagram below to answer the following question: What is the activation energy of the reaction?

• 40 kj

• 60 kj

• 10 kj

• 20 kj

What two factors govern whether a collision between reacting particles will be effective?

• orientation and potential energy 
• kinetic energy and temperature 
• kinetic energy and orientation 
• potential energy and kinetic energy