Equilibrium, Keq, Ksp & Le Chatelier's Principle: Honors

At what time the reaction reached equilibrium?

• t₁
• t₂
• t₃
• t₄

Identify the labels (a) and (b) on the graph.

• a is concentration of reactants and b is the concentration of product
• a is concentration of product and b is the concentration of reactant
• a is the volume of reactants and b is the volume of product
• a the mass of reactants and b is the mass of product

For the reaction...
SO₂ + O₂ <=>  SO₃
If the equilibrium position shifts to the right, the concentration of O₂ will ___________.

• increase
• decrease
• remain the same
• double

Consider the following reaction:
2SO_2(g) + O_2(g) <=> 2SO_3(g):  ΔΗ = - 197 kJ mol ^-1
Which of the following will NOT shift the equilibrium position to the right?

• Adding more O₂
• Adding a catalyst
• increasing the pressure
• Lowering the temperature

The following reaction :    
SO_{2 (g)} +  NO_{2 (g)} <=> SO_{3 (g)} + NO (g)  
had reached a state of equilibrium, was found to contain  
0.40 mol L^-1 SO₃ , and 0.30 mol L^-1 NO,
0.15 mol L^-1NO₂ , and 0.20 mol L^-1 SO₂.
Calculate the equilibrium constant  for this reaction. 

• 4
• .42
• .25
• 1

2SO₂(g)+O₂(g)⇌2SO₃(g)
Decreasing volume of container will

• shift equilibrium right
• shift equilibrium left
• change K
• have no change

What is the proper K_eq for the following reaction? 
   2 NO_(g)  +  O_2(g) ⇌ 2 NO_2(g)

• K_eq = [NO₂]² / [NO]²[O₂]
• K_eq =  [NO]²[O₂] / [NO₂]²
• K_eq = [NO]²[O₂][NO₂]²
• K_eq = 2[NO][O₂] / 2[NO₂]

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.

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

• increase
• decrease
• remain the same
• triple

For the following reaction: H₂(g) + Cl₂ (g) ↔ 2HCl(g), calculate the concentration of HCl when K_eq= 2.3x10^-5, [H₂]= 0.0056mol, [Cl₂]= 0.0048mol.

• 6.2 x 10^-10 M

• 2.5 x 10^-5 M

• 1.1 M

• 1.2 M