Reversible Reactions and Equilibrium

What is this symbol '⇌' used to represent?

• A redox reaction

• A reversible reaction

• A physical change

Tags

NGSS.HS-PS1-6

What term is used to describe a chemical reaction in which the forward and reverse reaction rates are the same?

• A static equilibrium

• An equal equilibrium

• A dynamic equilibrium

Tags

NGSS.HS-PS1-5

When a reversible reaction is at equilibrium, which of these statements is true?

• The concentration of products is greater than the concentration of reactants

• The concentration of products remains constant over time

• The concentration of products is equal to the concentration of reactants

Tags

NGSS.HS-PS1-6

One of the stages in sulfuric acid production is described by this equation: 2SO₂(g) + O₂(g) ⇌ 2SO₃(g). What will happen to the yield of SO₃ if the pressure is increased?

• It will go up

• It will go down

• It will stay the same

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

Given the K_c for a forward reaction, how can you find K_c for the reverse reaction?

• Divide K_c by 1

• Divide 1 by K_c

• Square K_c

• Take the square root of K_c

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

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-PS1-7

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.