Dynamic Equilibrium

This symbol indicates that a reaction is ____________

• reversible

• irreversible

Which of the following is incorrect? 
A dynamic equilibrium can be achieved...

• From 100% reactants

• From 100% products

• In a closed system

• In an open system

Tags

NGSS.HS-PS1-5

When the system A + B C + D is at dynamic equilibrium

• the sum of the concentrations of A and B must equal the sum of the concentrations of C and D.

• ,the forward reaction has stopped.

• both the forward and the reverse reactions have stopped.

• the reverse reaction has stopped

• neither the forward nor the reverse reaction has stopped.

Around what time does the reaction reach equilibrium?

• 25 min

• 45 min

• 70 min

• 80 min

Tags

NGSS.HS-PS1-6

Which of the following statements correctly describes any chemical reaction that has reached equilibrium?

• The reaction is now irreversible.

• The rates of the forward and reverse reactions are equal.

• Both forward and reverse reactions have halted.

• The concentrations of products and reactants are equal.

Tags

NGSS.HS-PS1-6

What are the two factors to look for when determining if the reaction is at equilibrium?

• Forward reaction rate is faster than the reverse and concentrations are equal

• Forward and reverse reaction rates are equal and concentration is constant

• Forward and revers reaction rates are equal and concentration is equal

• Forward reaction rate is faster than the reverse and concentration is equal

Tags

NGSS.HS-PS1-6

Why is equilibrium called a dynamic state?

• Chemists try to convert as much reactants as possible into products.

• The reactions at equilibrium continue to take place once equilibrium is established.

• The products of a forward reaction are favored, so equilibrium lies to the right.

• All chemical reactions are considered to be reversible under suitable conditions.

Which is the correct equilibrium constant expression for the following reaction? Fe₂O_3(s) + H_2(g) —> Fe_(s) + H₂O_(g)

• K = [H₂O]3 / [H₂]³

• K = [Fe₂O₃] [H₂]³ / [Fe]²[H₂O]³

• K = [Fe]²[H₂O]³ / [Fe_2O₃] [H₂]³

• K= [Fe] [H₂O] / [Fe₂O₃] [H₂]

• K = [H₂O] / [H₂]

A very high value for K indicates that

• reactants are favored.

• products are favored.

• equilibrium is reached slowly.

• equilibrium has been reached

For any reaction at chemical equilibrium, the concentrations of products and reactants

• are equal.

• change

• remain unchanged

• decrease