Chemistry Equilibrium

A chemical reaction is in equilibrium when:

• The forward and reverse reaction have stopped

• The equilibrium constant equals 1

• The forward and reverse reaction rates are equal

• No reactants remain

Tags

NGSS.HS-PS1-5

When is the rate of the forward reaction the greatest?

• At equilibrium

• In the beginning, when there are more reactants than products

• In the end, when there are more products than reactants

• Never

Tags

NGSS.HS-PS1-5

How is chemical equilibrium different from static equilibrium?

• They are different

• Chemical equilibrium is when a reversible reaction stops completely, and static equilibrium is when a reversible reaction has equal rates of the forward and reverse reaction.

• Chemical equilibrium is when the rates of two opposite events are equal. Something is happening but there is no change. Static equilibrium is when something stops.

• There is no difference between them

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]

Tags

NGSS.HS-PS1-7

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]

Calculate Kc for the reaction HI_(g) —> H_2(g) + I_2(g) given that the concentrations of each species at equilibrium are as follows: [HI] = 0.85 mol/L, [I₂] = 0.60 mol/L, [H₂] = 0.27mol/L.

• 0.19

• 0.22

• 4.5

• 5.25

• 160

Tags

NGSS.HS-PS1-7

TRUE or FALSE:

"At equilibrium, the RATES of the forward and reverse reactions are EQUAL"

• True

• False

Tags

NGSS.HS-PS1-6

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

• Chemical Equilibrium

• Chemical Balance

• Stoichiometry

• Chemical Reaction

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.

When the forward and reverse reactions are occurring at the same rate, the reaction is said to be at:

• Chemical equilibrium

• Chemical reaction

• Chemical constant

• Chemical peace

Tags

NGSS.HS-PS1-6