Equilibrium Review

Around what time does the reaction reach equilibrium?

• 25 min

• 70 min

• 45 min

• 80 min

When the rate of the forward reaction is equal to the rate of the backward reaction, the system is said to be in _____

• Chemical Balance

• Chemical Constant

• Chemical Reaction

• 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 or right

What happens to the equilibrium if we add methane (CH₄)?

• It shifts left, towards the reactants

• It shifts right, towards the products

• It does not shift

What happens to the equilibrium if we remove water (H₂O)?

• It shifts left, towards the reactants

• It shifts right, towards the products

• It does not shift

What happens when the system is cooled (heat is removed)?

• The reaction shifts left, towards the reactants

• The reaction shifts right, towards the products

• There is no shift

When writing an endothermic reaction, heat energy is stated as

• product
• catalyst
• reactant

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

What is the equilibrium-constant expression for 
CO₂(g) + H₂(g) ↔ CO(g) + H₂O(l)

• K_c= [CO][H₂O] / [CO₂][H₂]  
• K_c= [CO₂][H₂] / [CO]
• K_c= [CO₂][H₂] / [CO][H₂O]
• K_c= [CO] / [CO₂][H₂]  

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]