quiz 3 (chemical equilibrium)

2A + 3B <----> 2AB

The reverse reaction forms the substance __________.

• A

• B

• AB

• A + B

Which of the following is NOT true at equilibrium?

• The forward and reverse reactions proceed at the same rate.

• The concentrations of reactants and products do not change.

• The concentration of the reactants is equal to the concentration of the products.

• The forward and reverse reactions continue to occur.

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

For the reaction...

H_{2 (g)} + Cl_{2 (g)} <−> 2HCl _(g) + heat

If the temperature is cooled, the _________ reaction will be favored.

• forward

• reverse

• forward and reverse

Le Chatelier's Principle states that:

• a disturbing force must be applied to a system in order for it to reach equilibrium.

• when a system at equilibrium is disturbed, a new equilibrium constant is established.

• when a chemical system at equilibrium is disturbed, the system shifts in order to minimize the effect.

• when a chemical system is at equilibrium it is no longer possible to alter the system.

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

The following factors affect the position of equilibrium EXCEPT

• Concentration

• State of Matter

• Temperature

• Pressure

What is the effect of increasing the pressure on the following equilibrium: 2NO(g) + O₂ (g) ⇌2NO₂(g)?

• The yield of NO₂ increases

• The yield of NO₂ decreases

• The reaction is slower

• The concentration of O₂ increases.

Consider this system:

2CCl₄(g) + O₂(g)<->2COCl₂(g) + 2Cl₂(g) ΔH = -35 kJ/mol_rxn

Predict the effect of increasing temperature.

• Speed up forward reaction.

• Speed up reverse reaction.

• No change.

For the reaction...

N_{2 (g)} + 3 H_2(g) ⇌ 2 NH_{3 (g)}

If the pressure in the system is decreased, which substance(s) will increase in concentration?

• N₂

• H₂

• N₂ and H₂

• NH₃