Equilibrium in Chemistry

What is Le Chatelier's principle?

• Principle that states a system at equilibrium will shift in the same direction as the disturbance

• Principle that states a system at equilibrium will never shift

• Principle that states a system at equilibrium will only shift if the disturbance is very large

• Principle that states a system at equilibrium will shift to counteract a disturbance

Define equilibrium constant.

• Numerical value representing the ratio of product to reactant concentrations at equilibrium

• The temperature at which a reaction takes place

• The total amount of reactants in a system

• The rate at which a reaction occurs

For K_p = K_c:

•  Δn=1

• Δn>1

• Δn=0

• Δn<1

Describe chemical equilibrium.

• A state where only the forward reaction occurs

• A state where the reaction stops completely

• A state where the reverse reaction occurs faster than the forward reaction

• A state in a chemical reaction where the forward and reverse reactions occur at the same rate

What is the relation between Kc and Kp?

• Kp = Kc/RT

• Kp = Kc + RT

• Kp = Kc(RT)^(Δn)

• Kp = Kc * Δn

Explain the concept of dynamic equilibrium.

• A state in which the rate of the forward reaction is equal to the rate of the reverse reaction, and the concentrations of the reactants and products remain constant over time.

• A state in which the concentrations of the reactants and products keep changing over time

• A state in which the reaction has come to a complete stop

• A state in which the rate of the forward reaction is greater than the rate of the reverse reaction

Henry’s Law is applicable for

• solid-liquid equilibrium

• solid-gas equilibrium

• gas-liquid equilibrium

• gas-solution of gas equilibrium

In which of the following equilibrium Kc and Kp are not equal?

• 2C (s) + O(g) ⇌ 2CO₂ (g)

• 2NO (g) ⇌ N₂ (g) + O₂ (g)

• SO₂ (g) + NO₂ (g) ⇌ SO₃(g) + NO(g)

• H₂(g) + I₂ (g) ⇌ 2HI(g)

Note - a bit tricky question plz pay attention

In a reversible reaction, two substances are in equilibrium. If the concentration of each one is doubled then the equilibrium constant will be

• Reduce to half its original value

• Reduced to one fourth of its original value

• Doubled

• Constant

At equilibrium, the concentrations of

N2=3.0 × 10–3M, O2 = 4.2 × 10–3M and

NO= 2.8 × 10–3M in a sealed vessel at 800K. What will be Kc for the reaction

N2(g) + O2(g) ⇌ 2NO(g)

• 0.622

• 0.522

• 0.422

• 0.322