Chapter 6 : Chemical Equilibrium

Presentation

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Chemistry

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11th - 12th Grade

•

Medium

•

NGSS

HS-PS1-6, HS-PS1-5, HS-PS1-7

Standards-aligned

SITI NUR AYISSAH SANUDIN

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13 Slides • 15 Questions

Chapter 6 : Chemical Equilibrium

Multiple Choice

What is a Reversible reaction

A reaction going forward and backward at same time

A reaction going forward and backward at different time

forward reaction

backward reaction

Multiple Choice

What is the symbol which is used in reversible reactions?

→

⇌

Multiple Choice

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

Chemical Constant

Chemical Reaction

Multiple Choice

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

Multiple Choice

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.

Multiple Choice

A chemical equilibrium may be established by starting a reaction with ____________

reactants only

products only

equal quantities of reactants and products

any quantities of reactants and products

all of the above

Multiple Choice

Which is the reactant - and why?

A, as concentration decreases

B, as concentration decreases

A, as concentration increases

B, as concentration increases

Multiple Choice

At what time the reaction reached equilibrium?

t₁

t₂

t₃

t₄

Multiple Choice

What are [A] and [B]?

concentration of reactants

concentration of products

energy of reactants

energy of products

Multiple Choice

What is the K_c expression for this reaction?
2 NO_(g) + O_2(g) ⇌ 2 NO_2(g)

K_c= [NO₂]² / [NO]²[O₂]

K_c= [NO]²[O₂] / [NO₂]²

K_c= [NO]²[O₂] [NO₂]²

K_c= [NO₂]² / [NO]² + [O₂]

Multiple Choice

What is the equilibrium-constant expression for

CO₂(g) + H₂(g) ⇌ CO(g) + H₂O(l)

K_c= [CO][H₂O] / [CO₂][H₂]

K_c= [CO₂][H₂] / [CO]

K_c= [CO₂][H₂] / [CO][H₂O]

K_c= [CO] / [CO₂][H₂]

Multiple Choice

If the equilibrium constant is much less than one (K << 1) then

Equilibrium is not established.

Equilibrium lies to the right (products are favored)

Equilibrium lies to the left (reactants are favored)

Neither products or reactants are favored.

Multiple Choice

If the equilibrium constant is much greater than one (K >> 1) then

Equilibrium is not established.

Equilibrium lies to the right (products are favored)

Equilibrium lies to the left (reactants are favored)

Neither products or reactants are favored.

Multiple Choice

If the reaction quotient Q has a value larger than the related equilibrium constant, K _________

the reaction is at equilibrium

the reaction is not at equilibrium, and will make more products at the expense of reactants

the reaction is not at equilibrium, and will make more reactants at the expense of products

the value of K will increase until it is equal to Q

Multiple Choice

If the reaction quotient Q has a smaller value than the related equilibrium constant, K, _________

the reaction is at equilibrium

the reaction is not at equilibrium, and will make more products at the expense of the reactants

the reaction is not at equilibrium, and will make more reactants at the expense of the products

the value of K will not increase until it is equal to Q

Chapter 6 : Chemical Equilibrium

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