Call Now to Set Up Tutoring:

(888) 888-0446

AP Chemistry : Chemical Equilibrium

Study concepts, example questions & explanations for AP Chemistry

Create An Account

All AP Chemistry Resources

6 Diagnostic Tests 225 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #86 : Reactions And Equilibrium

Determine the equilibrium expression for the following reaction:

$2A_{(aq)} + B_{(s)}\rightleftharpoons C_{(aq)}$

Possible Answers:

$K_{eq}=\frac{[C]}{[A]}$

$K_{eq}=\frac{[C]}{[A]^{2}}$

$K_{eq}=\frac{[A]^{2}[B]}{[C]}$

$K_{eq}=\frac{[C]}{[A]^{2}[B]}$

Correct answer:

$K_{eq}=\frac{[C]}{[A]^{2}}$

Explanation:

Equilibrium expressions are a ratio of the concentration of products raised to the stoichiometric coefficient, divided by reactants raised to the stoichiometric coefficient. Solids are omitted from this expression.

For the generic example $aA+bB\rightleftharpoons cC+dD$ , the equilibrium expression is $K_{eq}=\frac{[C]^c[D]^d}{[A]^a[B]^b}$ .

For our given reaction, we can find the equilibrium expression in a similar manner. Do not forget to omit the solid component of the reaction!

$2A_{(aq)} + B_{(s)}\rightleftharpoons C_{(aq)}$

$K_{eq}=\frac{[C]}{[A]^2}$

Report an Error

Example Question #51 : Chemical Equilibrium

Calculate the equilibrium constant for $2 C(g) \Leftrightarrow A (g) + B (g)$ given the following information:

$A (g) + B (g) \Leftrightarrow 2 C (g)$ $K_1 = 4.39 x 10^{-3}$

$2 C(g) \Leftrightarrow D (g) + E (g)$ K_2 = 1.15 x 10^4

Possible Answers:

11.4

$1.14\, x\, 10^2$

$2.28 \, x \, 10^2$

22.8

$3.14 \, x \, 10^{-3}$

Correct answer:

$2.28 \, x \, 10^2$

Explanation:

$2 C \Leftrightarrow A + B$ K = 1/K_1= 228

Report an Error

Example Question #52 : Chemical Equilibrium

Calculate the equilibrium constant for $A (g) + B (g) \Leftrightarrow D (g) + E (g)$ given the following information:

$A (g) + B (g) \Leftrightarrow 2 C (g)$ $K_1 = 4.39 \, x \, 10^{-3}$

$2 C(g) \Leftrightarrow D (g) + E (g)$ $K_2 = 1.15 \, x \, 10^4$

Possible Answers:

0.143

25.3

73.2

50.5

15.8

Correct answer:

50.5

Explanation:

$A + B \Leftrightarrow 2 C$ $K_1 = 4.39 x 10^{-3}$

$2C \Leftrightarrow D + E$ $K_2 = 1.15 x 10^{-4}$

$K = K_1 K_2 = (4.39 x 10^{-3}) (1.15 x 10^{-4}) = 50.5$

Report an Error

Example Question #53 : Chemical Equilibrium

Calculate the equilibrium constant for $N_2 (g) + O_2 (g) + Cl_2 (g) \Leftrightarrow 2 \: NOCl$ given the following information:

$\frac{1}{2}N_2 + O_2(g) \Leftrightarrow NO_2 (g)$ $K_1 = 1.0 \, x \, 10^{-9}$

$NOCl(g) + \frac{1}{2} O_2 (g) \Leftrightarrow NO_2Cl$ $K_2 = 1.1 \, x\, 10^2$

$NO_2 (g) + \frac{1}{2} Cl_2 \Leftrightarrow NO_2Cl$ K_3 = 0.3

Possible Answers:

$7\, x\, 10^{-24}$

$7\, x\, 10^{-8}$

$3\, x\, 10^{-3}$

$5 \, x \, 10^{-10}$

Correct answer:

$7\, x\, 10^{-24}$

Explanation:

$2 (1/2 N_2 + O_2 \Leftrightarrow 2 NO_2 )$ $K = K_1^2 = 1 x 10^{-18}$

$2 (NO_2Cl \Leftrightarrow NOCl + 1/2 O_2)$ $K = (1/K_2)^2 = 8.3 x 10^{-5}$

$2 (NO_2 + 1/2 Cl_2 \Leftrightarrow NO_2Cl)$ K = K_3^2 = 0.09

$K = (1 x 10^{-18}) (8.3 x 10^{-5}) (0.09) = 7 x 10^{-24}$

Report an Error

Example Question #54 : Chemical Equilibrium

Calculate the equilibrium constant for $2 NH_3 (g) + 3 I_2 (g) \Leftrightarrow N_2 (g) + 6 HI (g)$ given the following information:

$N_2 (g) + 3 H_2 (g) \Leftrightarrow 2 NH_3(g)$ K_1 = 0.50

$H_2 (g) + I_2 (g) \Leftrightarrow 2 HI (g)$ K_2 = 50

Possible Answers:

5.6 x 10^4

$3.2 x 10^{-3}$

1.5 x 10^3

2.8 x 10^6

2.5 x 10^5

Correct answer:

2.5 x 10^5

Explanation:

$2 NH_3 \Leftrightarrow N_2 + 3 H_2$ K = 1/K_1 = 2

$3 ( H_2 + I_2 \Leftrightarrow 2 HI)$ K = K_2^3 = 1.25 x 10^5

K = (2) (1.25 x 10^5) = 2.5 x 10^5

Report an Error

Example Question #55 : Chemical Equilibrium

Calculate the equilibrium constant for $2 HI (g) \Leftrightarrow H_2 (g) + I_2 (g)$ given the following information:

$H_2(g) + I_2 (g) \Leftrightarrow 2 HI (g)$ K_1 = 50

Possible Answers:

1.21

0.25

0.05

0.01

0.02

Correct answer:

0.02

Explanation:

$2 HI \Leftrightarrow H_2 + I_2$ K = 1/K_1 = 0.02

Report an Error

Example Question #1 : Calculating The Equilibrium Concentrations

Consider formation of Nitrogen monoxide: $N_2 (g) + O_2 (g) \Leftrightarrow 2 NO (g)$ with $K = 4.2 x 10^{-8}$ . If the initial concentration of N2 was 0.085M and O2 was 0.038 M, what is the concentration of nitrogen monoxide at equilibrium?

Possible Answers:

1.1 x 10^-3 M

3.2 x 10^-8 M

1.1 x 10^-4M

1.2 x 10^-6 M

1.2 x 10^-5 M

Correct answer:

1.2 x 10^-5 M

Explanation:

$K = \frac{[NO]^2}{[N_2 ][O_2 ]} =\frac{(2x)^2} {(0.085-x)(0.038-x) }$

$\sim \frac{4x^2}{(0.085)(0.038)} = 4.2 x 10^{-8}$

$x = 5.82 x 10^{-6}$

$[NO] = 2x = 2(6.82 x 10^{-6}) = 1.2 x 10^{-5}$

Report an Error

Example Question #56 : Chemical Equilibrium

Given the ICE table below, what are the signs on the terms that would appear in the “Change” row?

$M + 2L \Leftrightarrow ML2$

Possible Answers:

-x, -2x, +x

+x, +4x, -x

-x, -x, +x

+x, +x, +x

+x, +2x, +x

Correct answer:

-x, -2x, +x

Explanation:

Based on the balanced equation, one would use -x, -2x, and +x.

Report an Error

Example Question #1 : Calculating The Equilibrium Concentrations

Find the equilibrium concentrations for C in the following chemical reaction: A + B -> 2C

K = 9.0 x 10^-8

Possible Answers:

1.5 x 10^-4 M

1.2 x 10^-2 M

1.1 M

0.12 M

3.0 x 10^-3 M

Correct answer:

1.5 x 10^-4 M

Explanation:

03b

$K = 9 x 10^{-8} =\frac{ [C]^2} {[A][B]} = \frac{(2x)^2}{(0.5-x)^2} \sim \frac{4x^2}{(0.25) }$

$[C] = 2 (7.5 x10^{-5} ) = 1.5 x 10^{-4}$

Report an Error

Example Question #2 : Calculating The Equilibrium Concentrations

What is the equilibrium concentration for A- in the following reaction if the starting concentration of HA is 0.60 M?

$HA \Leftrightarrow H^+ + A^-$ $K = 2.0 x 10^{-5}$

Possible Answers:

1.2 M

1.2 x 10^-5 M

3.5 x 10^-3 M

2.3 x 10^-4 M

2.3 x 10^-3 M

Correct answer:

3.5 x 10^-3 M

Explanation:

$K = \frac{[H^+ ][A^- ]}{[HA]} = \frac{x^2}{0.6-x} = 2.0 x 10^{-5}$

$\frac{x^2}{0.6} \sim 2.0 x 10^{-5}$

$x = 3.5 x 10^{-3}$

$[A^- ] = x = 3.5 x 10^{-3}$

Report an Error

View AP Chemistry Tutors

Alejandro
Certified Tutor

Kennesaw State University, Bachelor of Science, Computer Software Engineering.

View AP Chemistry Tutors

Muhammad
Certified Tutor

The University of Texas at Dallas, Bachelor of Science, Mechanical Engineering.

View AP Chemistry Tutors

Megan
Certified Tutor

University of Wisconsin-Madison, Bachelor of Science, Chemical Engineering.

All AP Chemistry Resources

6 Diagnostic Tests 225 Practice Tests Question of the Day Flashcards Learn by Concept

Popular Subjects

Math Tutors in Philadelphia, GMAT Tutors in Los Angeles, GRE Tutors in Houston, GMAT Tutors in Chicago, Physics Tutors in Denver, GRE Tutors in Los Angeles, Chemistry Tutors in Atlanta, Calculus Tutors in Chicago, GRE Tutors in Chicago, Algebra Tutors in Philadelphia

Popular Courses & Classes

Spanish Courses & Classes in Washington DC, ISEE Courses & Classes in Seattle, Spanish Courses & Classes in Atlanta, ISEE Courses & Classes in Washington DC, LSAT Courses & Classes in San Francisco-Bay Area, GMAT Courses & Classes in Washington DC, SAT Courses & Classes in San Diego, ISEE Courses & Classes in Dallas Fort Worth, GRE Courses & Classes in Seattle, ISEE Courses & Classes in Miami

Popular Test Prep

ACT Test Prep in San Francisco-Bay Area, ISEE Test Prep in Denver, ISEE Test Prep in San Diego, SSAT Test Prep in New York City, SSAT Test Prep in Miami, GRE Test Prep in San Francisco-Bay Area, ISEE Test Prep in Dallas Fort Worth, ISEE Test Prep in Philadelphia, LSAT Test Prep in Chicago, LSAT Test Prep in Dallas Fort Worth

DMCA Complaint

If you believe that content available by means of the Website (as defined in our Terms of Service) infringes one or more of your copyrights, please notify us by providing a written notice (“Infringement Notice”) containing the information described below to the designated agent listed below. If Varsity Tutors takes action in response to an Infringement Notice, it will make a good faith attempt to contact the party that made such content available by means of the most recent email address, if any, provided by such party to Varsity Tutors.

Your Infringement Notice may be forwarded to the party that made the content available or to third parties such as ChillingEffects.org.

Please be advised that you will be liable for damages (including costs and attorneys’ fees) if you materially misrepresent that a product or activity is infringing your copyrights. Thus, if you are not sure content located on or linked-to by the Website infringes your copyright, you should consider first contacting an attorney.

Please follow these steps to file a notice:

You must include the following:

A physical or electronic signature of the copyright owner or a person authorized to act on their behalf; An identification of the copyright claimed to have been infringed; A description of the nature and exact location of the content that you claim to infringe your copyright, in \ sufficient detail to permit Varsity Tutors to find and positively identify that content; for example we require a link to the specific question (not just the name of the question) that contains the content and a description of which specific portion of the question – an image, a link, the text, etc – your complaint refers to; Your name, address, telephone number and email address; and A statement by you: (a) that you believe in good faith that the use of the content that you claim to infringe your copyright is not authorized by law, or by the copyright owner or such owner’s agent; (b) that all of the information contained in your Infringement Notice is accurate, and (c) under penalty of perjury, that you are either the copyright owner or a person authorized to act on their behalf.

Send your complaint to our designated agent at:

Charles Cohn Varsity Tutors LLC
101 S. Hanley Rd, Suite 300
St. Louis, MO 63105

Or fill out the form below:

Do not fill in this field

Contact Information

* Full legal name

Company name

* Phone number

* Email address

Address

* Address1

Address2

* City

* State

* Zipcode

* Country

Complaint Details

* URL of copyrighted work (where your original material is located)

* Please describe the copyrighted work so that it may be easily identified

I am the owner, or an agent authorized to act on behalf of the owner of an exclusive right that is allegedly infringed.

I have a good faith belief that the use of the material in the manner complained of is not authorized by the copyright owner, its agent, or the law.

This notification is accurate.

I acknowledge that there may be adverse legal consequences for making false or bad faith allegations of copyright infringement by using this process.

* Signature (your digital signature is legally binding)

HIGH SCHOOL

GRADUATE SCHOOL

K-8

Search 50+ Tests

math tutoring

science tutoring

foreign languages

elementary tutoring

other

Search 350+ Subjects

AP Chemistry : Chemical Equilibrium

Study concepts, example questions & explanations for AP Chemistry

All AP Chemistry Resources

Example Questions

Example Question #86 : Reactions And Equilibrium

Example Question #51 : Chemical Equilibrium

Example Question #52 : Chemical Equilibrium

Example Question #53 : Chemical Equilibrium

Example Question #54 : Chemical Equilibrium

Example Question #55 : Chemical Equilibrium

Example Question #1 : Calculating The Equilibrium Concentrations

Example Question #56 : Chemical Equilibrium

Example Question #1 : Calculating The Equilibrium Concentrations

Example Question #2 : Calculating The Equilibrium Concentrations

All AP Chemistry Resources

Report an issue with this question

DMCA Complaint

Contact Information

Address

Complaint Details

Email address:
Your name:
Feedback: