Chemical Equilibrium

For the reaction...

SO₂ + O₂ ⇌ SO₃

If the concentration of SO₂ is increased, the equilibrium of the reaction will shift ___________.

• left

• right

• left and right

• neither left nor right

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

For the reaction...

N_{2 (g)} + 3 H_2(g) ⇌ 2 NH_{3 (g)}

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

• N₂

• H₂

• N₂ and H₂

• NH₃

2SO₂(g)+O₂(g)⇌2SO₃(g)
Removing O₂(g) will

• shift equilibrium right
• shift equilibrium left
• increase pressure
• have no change

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.

H₂(g)+Cl₂(g)⇌2HCl(g)

The forward reaction is exothermic. What will happen to the equilibrium if the temperature is increased?

• equilibrium shifts right

• equilibrium shifts left

• You cannot predict the effect

• no change

Tags

NGSS.HS-PS1-5

At elevated temperatures ammonium carbonate, NH₂COONH₄, is in equilibrium with NH₃ and CO₂ according to the equation;

NH₂COONH₄(s) ↔ 2 NH₃(g) + CO₂(g)

What is the equilibrium expression for this reaction?

• K = 2 [NH₃][CO₂]

  [NH₂COONH₄]

• K = [NH₃]²[CO₂]

  [NH₂COONH₄]

• K = 2 [NH₃][CO₂]

• K = [NH₃]²[CO₂]

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

Tags

NGSS.HS-PS1-5

At what time the reaction reached equilibrium?

• t₁
• t₂
• t₃
• t₄

What are [A] and [B]?

• concentration of reactants
• concentration of products
• energy of reactants
• energy of products

Tags

NGSS.HS-PS1-5

When K is large, 

• There are more products than reactants when the reaction reached equilibrium.
• There are more reactant than products when the reaction reached equilibrium.
• The amount of reactants is equal to the amount of products.

Tags

NGSS.HS-PS1-6