Are my answers to these Chemistry questions on Le Chatelier correct?

Question

Le Chatelier’s principle states which of the following?

A. When a stress is applied to an equilibrium, the reaction will shift in a way that relieves the stress and restores the equilibrium.

B. When a stress is applied to an equilibrium, the reaction will shift in a way that causes the equilibrium to be destroyed.

C. When the concentration of a solid is added to an equilibrium, the reaction will shift to a higher level of equilibrium.

D. When the concentration of a solid is added to an equilibrium, the reaction will shift to a lower level of equilibrium.

E. All of the Above

 

Le Chatelier’s principle does not consider _______ to be a source of stress to an equilibrium.

A. temperature

B. pressure

C. solids

D. gases

E. viscosity

 

According to Le Chatelier’s principle, increased pressure will _______.

A. always shift the equilibrium to a higher reaction rate

B. shift the equilibrium toward the side with the largest number of gas molecules

C. destroy the equilibrium if there are no gas molecules

D. shift the equilibrium away from the side with the largest number of gas molecules

E. destroy the equilibrium if the number of gas molecules is equal on both sides

 

According to Le Chatelier’s principle, increased temperature will _______.

A. always shift the equilibrium to a higher reaction rate

B. shift the equilibrium toward the side that contains energy

C. shift the equilibrium away from the side that contains energy

D. destroy the equilibrium if there are no gas molecules

E. destroy the equilibrium if the number of gas molecules is equal on both sides

Answer 1

1 is correct, but you didn't use it in 3 and 4.

2 is just a bad question. T and P are definitely used, as are changes in equilibrium concentrations or partial pressures of gases (gases that are involved in the reaction affect the equilibrium - a neutral gas does not !!!). Solids generally do not affect equilibrium unless the solid goes from being there to not (or vice versa). Viscosity is probably "the answer" because it doesn't have to do with chemical equilibrium and generally doesn't change. (It's involved more in physical processes)

3) Pressure increase means moles of gas needs to go DOWN in order to alleviate the stress.

4) Temperature increase increases energy, so the equilibrium will move toward the higher energy state to USE energy. It's better to think of energy release or intake rather than the energies of the chemicals. T up favors endothermic reaction, T down favors exothermic.

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