An equilibrium constant with a large value, e.g. K c = 1000, indicates…

Mostly reactants at equilibrium

An equilibrium constant with a value of 4.6 x 10 -15 indicates that at equilibrium

approximately equal concentrations of reactants and products are present.

Consider the following reaction. What would be the equilibrium constant expression? 4Br 2 (g) + CH 4 (g) ↔ 4HBr(g) + CBr 4 (g)

[HBr] 4 [CBr 4 ]/ [Br 2 ] 4 [CH 4 ]

[Br 2 ] 4 [CH 4 ]/ [HBr] 4 [CBr 4 ]

[HBr] 4 [CBr 4 ]/ [Br 2 ] 4 [CH 4 ] 4

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

Equilibrium lies to the right (products are favored)

Equilibrium is not established.

Equilibrium lies to the left (reactants are favored)

Neither products or reactants are favored.

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

Equilibrium lies to the left (reactants are favored)

Equilibrium is not established.

Equilibrium lies to the right (products are favored)

Neither products or reactants are favored.

Why does a higher concentration increase the rate of reaction?

it increases the frequency of particle collisions

it increases the amount of reactants

it lowers the activation energy

it increases the energy of particle collisions

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

Forward and reverse reaction rates are equal and amounts of reactants and products are constant

Forward reaction rate is faster than the reverse reaction rate and amounts of reactants are greater than the products

Forward reaction rate is slower than the reverse reaction rate and amounts of reactants are greater than the products

Forward reaction rate is faster than the reverse reaction rate and amounts of products are greater than the reactants

Identify the labels (a) and (b) on the graph.

a is the amount (concentration) of reactants and b is the concentration of products

a is the amount (concentration) of products and b is the concentration of reactants

a is the volume of reactants and b is the volume of products

a is the mass of reactants and b is the mass of products

What is favored when your Keq equilibrium constant is significantly above 1 in its value.

reactants & products are equally favored

Which of the following statement is correct about the reaction quotient, Q c and the equilibrium constant, K c .

The reaction mixture is richer in product if Q c < K c

For the same reaction, K c is larger than Q c

For the same reaction, Q c and K c have the same value.

The value of Q c changes until it reaches the value of K c at equlibrium.

For the reaction PCl 5 (g) → PCl 3 (g) + Cl 2 (g) Kc = 0.0454 at 261°C. If a vessel is filled with these gases such that the initial concentrations are [PCl 5 ] = 0.25M, [PCl 3 ] = 0.20 M, and [Cl 2 ] = 2.25 M, in which direction will a reaction occur and why?

toward reactants because Q = 1.8

toward products because Q = 0.56

toward reactants because Q = 0.0454

toward products because Q = 2.8

At elevated temperatures ammonium carbonate, NH 2 COONH 4 , is in equilibrium with NH 3 and CO 2 according to the equation; NH 2 COONH 4 ( s ) ↔ 2 NH 3 ( g ) + CO 2 ( g ) What is the equilibrium expression for this reaction?

K = 2 [NH 3 ][CO 2 ] [NH 2 COONH 4 ]

K = [NH 3 ] 2 [CO 2 ] [NH 2 COONH 4 ]

Which is the correct equilibrium constant expression for the following reaction? Fe 2 O 3(s) + H 2(g) —> Fe (s) + H 2 O (g)

K = [Fe 2 O 3 ] [H 2 ] 3 / [Fe] 2 [H 2 O] 3

K = [Fe] 2 [H 2 O] 3 / [Fe 2 O 3 ] [H 2 ] 3

K= [Fe] [H 2 O] / [Fe 2 O 3 ] [H 2 ]

Equilibrium Practice

Quiz

•

Science

•

9th - 12th Grade

•

Practice Problem

•

Hard

•

NGSS

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

+2

Standards-aligned

Alison Walker

FREE Resource

40 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

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

This symbol indicates that a reaction is ____________

reversible

irreversible

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.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are [C] and [D]?

concentration of reactants

concentration of products

energy of reactants

energy of products

Such reactions which continue in both directions are called:

Irreversible reactions

Reversible reactions

Non-reactive reactions

dynamic reactions

6.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

At what time the reaction reached equilibrium?

t₁

t₂

t₃

t₄

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the two graphs reaches equilibrium?

The left one.

The right one.

Both of them.

Neither.

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Equilibrium Practice

40 questions

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

This symbol indicates that a reaction is ____________

Which of the following is NOT true at equilibrium?

What are [C] and [D]?

Such reactions which continue in both directions are called:

At what time the reaction reached equilibrium?

Which of the two graphs reaches equilibrium?

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

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)

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Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science

Equilibrium Practice

40 questions

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

This symbol indicates that a reaction is ____________

Which of the following is NOT true at equilibrium?

What are [C] and [D]?

Such reactions which continue in both directions are called:

At what time the reaction reached equilibrium?

Which of the two graphs reaches equilibrium?

A2 + B2 ↔ 2 ABA_{2\ }+\ B_{2\ }\ \leftrightarrow\ \ 2\ ABA2 ​+ B2 ​ ↔ 2 AB The reverse reaction forms the substance __________.

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

What is the proper Keq for the following reaction? 2 NO(g) + O2(g) ⇌2 NO2(g)

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Similar Resources on Wayground

Popular Resources on Wayground

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

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)