equilibrium

Le Chaltelier's Principle states that if a chemical system at equilibrium is stressed,

• the system will adjust to increase the stress
• the system will adjust to reduce the stress
• the system will not adjust

Which of the following is not a way to stress a chemical system?

• temperature
• pressure
• time

A reaction that releases heat energy is known as

• endothermic
• exothermic
• isothermic

When writing an endothermic reaction, heat energy is stated as

• product
• catalyst
• reactant

An exothermic reaction is allowed to reach equilibrium. If heat energy is then removed, the equilibrium will shift

• toward the middle
• toward the reactant side
• toward the product side

Changes in pressure will only affect substances that are in the __________ state.

• gaseous
• liquid
• solid

An increase of concentration in a system at chemical equilibrium will cause the reaction to shift

• to the same side
• to the opposite side
• no shift will occur

For the reaction...
heat  +  N₂  +  O₂  <−>  2NO
If  O₂ is removed, the  concentration of N₂ will _______.

• increase
• decrease
• remain the same
• double

For the reaction...
heat  +  N₂  +  O₂  <−>  2NO
If  NO is removed  from the system, the concentration of N₂ will _______.

• increase
• decrease
• remain the same
• double

For the reaction...
heat  +  N₂  +  O₂  <−>  2NO
If the heat is added to the chemical system, the equilibrium will shift _______.

• left
• right
• left and right
• neither left nor right