VHCC Chapter 14 Equilibrium Review

At what time the reaction reached equilibrium?

• t₁
• t₂
• t₃
• t₄

2NH₃+22kJ↔N₂+3H₂
Which direction does the reaction shift if NH₃ was added?

• Shift right 
• Shift left
• No shift
• Shift both directions

Tags

NGSS.HS-PS1-5

2NH₃+22kJ↔N₂+3H₂
Which direction does the reaction shift if H₂ was removed?

• Shift right 
• Shift left
• No shift
• Shift both directions

Tags

NGSS.HS-PS1-5

An equilibrium constant with a large magnitude indicates…

• A very fast reaction
• Higher concentration of products at equilibrium
• Higher concentration of reactants at equilibrium
• Nothing, without considering the stoichiometry of the reaction

Which is an appropriate formulation of the equilibrium constant for the reaction:

MgCO₃(s) + 2HCl(g) ↔ MgCl₂(s) + CO₂(g) + H₂O(l)?

• [CO₂]

  [HCl]

• [MgCl₂][CO₂][H₂O]

  [HCl]²[MgCO₃]

• [HCl]²[MgCO₃]

  [MgCl₂][CO₂][H₂O]

• [CO₂]

  [HCl]²

• [CO₂][H₂O]

  [HCl]²

 Equilibrium is reached in chemical reactions when:

• The rates of the forward and reverse reactions become equal.
• The concentrations of reactants and products become equal.
• The temperature shows a sharp rise.
• All chemical reactions stop.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-6

NGSS.HS-PS1-7

The reaction quotient for a system is 7.2 × 10². If the equilibrium constant for the system is 36, what will happen as equilibrium is approached?

• There will be a net gain in product
• There will be a net gain in reactant.
• There will be a net gain in both product and reactant
• There will be no net gain in either product or reactant.

For the reaction given, 2.00 moles of A and 3.00 moles of B are placed in a 6.00-L container. A(g) + 2B(g) ⇌ C(g). At equilibrium, the concentration of A is 0.232 mol/L. What is the value of K?

• 1.47
• 1.15
• 0.232
• 4.94

What would happen to the system if oxygen were added:

4NH₃(g) + 5O₂(g) ⇌ 4NO(g) + 6H₂O(g)

• More ammonia would be produced.
• More oxygen would be produced.
• The equilibrium would shift to the right.
• The equilibrium would shift to the left.

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