Equilibrium CP 2021

This symbol indicates that a reaction is ____________

• reversible
• irreversible

At what time the reaction reached equilibrium?

• t₁
• t₂
• t₃
• t₄

Which of the two graphs reaches equilibrium?

• The left one.
• The right one.
• Both of them.
• Neither.

 $A_2\ +\ B_2\ \ \leftrightarrow\ \ 2\ AB$  
The forward reaction forms the substance __________.

•  $A_2$  

•  $B_2$  

• AB

•  $A_2+B_2$  

  $A_{2\ }+\ B_{2\ }\ \leftrightarrow\ \ 2\ AB$  
The reverse reaction forms the substance __________.

•  $A_2$  

•  $B_2$  

• AB

•  $A_2+B_2$  

During equilibrium, the rates of the forward and the reverse reaction are ________

• the same 
• unequal
• unequal for exothermic reactions
• unequal for endothermic reactions

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.

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

What is the proper K_eq for the following reaction?

2 NO_(g) + O_2(g) ⇌2 NO_2(g)

What is the equilibrium expression for:
Fe₃O₄(s) + 4H₂(g) <=> 3Fe(s) + 4H₂O(g)
K_c =