Homework

Homework Questions? Ask a Tutor for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Homework

Review Questions 1. If A B is a first order reaction and

Customer Question
Review Questions 1. If A?B is a...
Review Questions
1.
If A?B is a first order reaction and the concentration of A falls from 0.050 M to 0.015 M after a period of 20 minutes, what is the rate constant, k, for this reaction?
A) -0.060 min-1
B) 17 min-1
C) 380 min-1
D) 2.6 x 10-6 min-1
E) 0.060 min-1

2. Which of the following plots will not be linear?
A) [A]t versus time for a first order process
B) [A]t versus time for a zero order process
C) ln [A]t versus time for a first order process
D) ln k vs 1/T
E) All of these relationships are linear.

3.
What is the rate law for the reaction A + B + C ? D, if the following data was collected?
Experiment No. [A] (M) (M) [C] (M) Rate (M/min)
1 0.1 0.2 0.3 230
2 0.2 0.4 0.3 460
3 0.3 0.6 0.6 620
4 0.4 0.2 0.3 920
A) rate = k[A][C]
B) rate = k[A]2[C]2
C) rate = k[A][C]
D) rate = k[A][C]3
E) rate = k[A]2[C]2

4.
The reason for an increase in the rate of reaction at higher temperatures may be due to:
• I. an increase in the number of collisions between reactants.
• II. a lower activation energy for the reactions.
• III. an increase in the average kinetic energy of the reactant molecules.
A) I.
B) II.
C) I, II and III are correct.
D) both I and III are correct.

5.
The rate law for the reaction: 2 NO2 (g) + F2 (g) ? 2 NO2F (g) is rate = k(NO2)(F2) Which of the following mechanisms provides the best explanation of the observed rate law?
A) 2 NO2 + F2 ? 2 NO2F (one step)
B) NO2 + F2 ? NO2F + F (fast)
NO2 + F ? NO2F (slow)

C) NO2 + F2 ? NO2F + F (slow)
NO2 + F ? NO2F (fast)

D) F2 ? 2 F (slow)
2 NO2 + 2 F ? 2 NO2F (fast)

E) None of these mechanism explains the observed rate law.


6.
Consider the following reaction: 2 NO(g) + Br2(g) 2 NOBr(g) for which the following data was obtained
[NO] (M) [Br2] (M) initial rate of reaction
(M/s)
1 0.025 0.040 1.2
2 0.025 0.080 2.4
3 0.025 0.120 3.6
4 0.050 0.040 4.8
5 0.075 0.040 10.8
The rate law for this reaction would be:
A) zero-order in Br2
B) half-order in Br2
C) first-order in Br2
D) second-order in Br2
E) None of the above.

7.
How many grams of sodium carbonate are needed to make 250 mL of 0.400 M sodium carbonate solution?
A) 10.6 g
B) 8.37 g
C) 106 g
D) 40.0 g

8.
The rate law for a reaction involving only A and B is 2nd order in A and 3rd order in B, respectively. If the concentration of A is doubled and the concentration of B is tripled the new rate will be:
A) 6 times faster.
B) 12 times faster.
C) 36 times faster.
D) 108 times faster..
E) 324 times faster.

9.
Suppose a reaction has the following rate law: rate = k[A]1/3 Which of the following can be concluded about the reaction?
A) The reaction mechanism has multiple steps.
B) Three molecules of A react with every molecule of B.
C) Three molecules of B react with every molecule of A.
D) Molecule A reacts at three times the rate of Molecule B.

10.
Which statement is true?
A) The rate of appearance of products of a chemical reaction is always equal to the rate of disappearance of reactants.
B) If a reaction follows a second-order rate law, it must have two steps in its reaction mechanism.
C) The half-life for a first-order reaction is always larger than the half-life for a second-order reaction.
D) The half-life for a first-order reaction is independent of the initial concentration of the reactant.
E) The half-life for a second-order reaction is independent of the initial concentration of the reactant.


11.
What is the correct rate law for the reaction: 2 NO (g) + O2 (g) ? 2 NO2 (g)?
A) rate = k[NO]2
B) rate = k[NO]2[O2]
C) rate = k[NO][O2]
D) rate = k[NO]2
E) The rate law is impossible to determine from the information given.

12.
If the reaction rate is tripled when the temperature of the reaction is increased from 150 K to 160 K, what is the activation energy of the reaction?
A) 3.50 kJ/mol
B) 9.60 kJ/mol
C) 14.3 kJ/mol
D) 21.9 kJ/mol
E) 39.1 kJ/mol

13.
A certain physiologically important first order reaction has an activation energy equal to 40.0 kJ/mole at normal body temperature (37oC). Without a catalyst, the rate constant for the reaction is 5.0 x 10-4s-1. To be effective in the human body, where the reaction is catalyzed by an enzyme, the rate constant must be at least 2.0 x 10-2 s-1. If the activation energy is the only factor affected by the presence of the enzyme, by how much must the enzyme lower the activation energy of the reaction to achieve the desired rate?
A) 9.5 kJ/mol
B) 38 kJ/mol
C) 78 kJ/mol
D) 140 kJ/mol
E) 730 kJ/mol

14.
A first-order reaction has the rate constant of 0.30 s-1. Determine the time it takes to decrease the reactant concentration from 0.6 M to 0.3 M.
A) 0.60 s
B) 2.3 s
C) 5.5 s
D) 2.0 s
E) 6.0 s

15.
The rate constant for a particular reaction is 1.3 x 10-4 M-1s-1 at 200 K. What is the overall order of the reaction?
A) 0
B) 1
C) 2
D) 3
E) 4






16.
The mechanism for the formation of product X is:
• A + B ? C + D
• B + D ? X
Indicate the intermediate for this reaction:
A) A
B) B
C) C
D) D
E) X

17.
What is the volume of 8.0 g of oxygen at STP?
A) 0.011 L
B) 0.36 L
C) 3.6 L
D) 5.6 L
E) 11 L

18.
Consider the following reaction: 2 NO(g) + Br2(g) 2 NOBr(g) for which the following data was obtained
[NO] (M) [Br2] (M) initial rate of reaction
(M/s)
1 0.025 0.040 1.2
2 0.025 0.080 2.4
3 0.025 0.120 3.6
4 0.050 0.040 4.8
5 0.075 0.040 10.8
The magnitude of the rate constant, k, for this reaction is:
A) less than 10-4
B) between 10-4 and 10-2
C) between 0.01 and 100
D) between 100 and 10,000
E) more than 10,000

19.
For the following reaction: 4 NH3 + 7 O2 4 NO2 + 6 H2O. The substance that is formed or removed the fastest is:
A) NH3
B) O2
C) NO2
D) H2O
E) All substances have the same rate for appearance/disappearance.

20.
The overall rate of a chemical reaction is determined by:
A) the slowest step in the reaction mechanism.
B) the first step in the reaction mechanism.
C) the fastest step in the reaction mechanism.
D) the last step in the reaction mechanism.
E) the number of chemical steps in the reaction mechanism.

21.
Which of the following statements is false about a catalyst?
A) Catalyst in living systems are called enzymes.
B) A catalyst does not change the equilibrium constant for a reaction.
C) A catalyst does not change the activation energy of a reaction.
D) A catalyst does not undergo any net chemical change.
E) A catalyst does not change the rate law for a reaction.

22.
Given the following information:
• Reaction I: H = -100 kJ/mol; Ea = 10 kJ/mol
• Reaction II: H = - 50 kJ/mol; Ea = 30 kJ/mol
• Reaction III: H = 100 kJ/mol; Ea = 20 kJ/mol
• Reaction IV: H = 50 kJ/mol; Ea = 15 kJ/mol
Which reaction will occur at the fastest rate?
A) I
B) II
C) III
D) IV

23.
Consider the following reaction: 2 NO(g) + Br2(g) 2 NOBr(g) for which the following data was obtained
Experiment No. [NO] (M) [Br2] (M) initial rate of reaction
(M/s)
1 0.025 0.040 1.2
2 0.025 0.080 2.4
3 0.025 0.120 3.6
4 0.050 0.040 4.8
5 0.075 0.040 10.8

The rate law for this reaction would be:
A) zero-order in NO
B) half-order in NO
C) first-order in NO
D) second-order in NO
E) None of the above.

24.
The decomposition of ether at 504 °C is a first order reaction with t½ = 27.0 min. What is the rate constant for this reaction?
A) 0.0257 min
B) 0.0257 min-1
C) 0.0177 min
D) 0.0177 min-1
E) None of the above.

25.
Which of the following statements is true?
A) The activation energy always increases as temperature rises.
B) The activation energy always decreases as temperature rises.
C) The rate constant always decreases as temperature rises.
D) The rate constant always increases as temperature rises.
E) The rate constant always increases as the activation energy increases.
Submitted: 8 years ago.Category: Homework
Show More
Show Less
Ask Your Own Homework Question
Answered in 12 hours by:
10/29/2009
Tutor: R.R. Jha, Tutor replied 8 years ago
R.R. Jha
R.R. Jha, Tutor
Category: Homework
Satisfied Customers: 5,471
Experience: B.Tech
Verified
Hi,
Please check question no. 3. Data given for experiment no. 3 seem to be incorrect, also correct the options given.
Thanks.
Ask Your Own Homework Question
Customer reply replied 8 years ago

What is the rate law for the reaction A + B + C ? D, if the following data was collected?

Experiment No.

[A] (M)

(M)

[C] (M)

Rate (M/min)

1

0.1

0.2

0.3

230

2

0.2

0.4

0.3

460

3

0.3

0.6

0.6

620

4

0.4

0.2

0.3

920

A) rate = k[A][C]
B) rate = k[A]2[C]2
C) rate = k[A][C]
D) rate = k[A][C]3
E) rate = k[A]2[C]2

I can not see the answers to the questions I guess it is because it is cramed up do you think you could line it up for me. thanks.

Customer reply replied 8 years ago
I was a little bit confused because you listed all the choices so the answers I can see it
Tutor: R.R. Jha, Tutor replied 8 years ago
This answer is protected
Would you like to ask this question?
If you've already paid for this answer, simply Login.
R.R. Jha
R.R. Jha, Tutor
Category: Homework
Satisfied Customers: 5,471
Experience: B.Tech
Verified
R.R. Jha and 87 other Homework Specialists are ready to help you
Ask your own question now
Ask R.R. Jha Your Own Question
R.R. Jha
R.R. Jha
R.R. Jha, Tutor
Category: Homework
Satisfied Customers: 5,471
5,471 Satisfied Customers
Experience: B.Tech

R.R. Jha is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

LogicPro

LogicPro

Engineer

5,731 satisfied customers

Expert in Java C++ C C# VB Javascript Design SQL HTML

Manal Elkhoshkhany

Manal Elkhoshkhany

Tutor

4,551 satisfied customers

More than 5000 online tutoring sessions.

Linda_us

Linda_us

Finance, Accounts & Homework Tutor

3,138 satisfied customers

Post Graduate Diploma in Management (MBA)

Chris M.

Chris M.

M.S.W. Social Work

2,636 satisfied customers

Master's Degree, strong math and writing skills, experience in one-on-one tutoring (college English)

F. Naz

F. Naz

Chartered Accountant

2,161 satisfied customers

Experience with chartered accountancy

Bizhelp

Bizhelp

CPA

1,887 satisfied customers

Bachelors Degree and CPA with Accounting work experience

Seanna

Seanna

Tutor

1,781 satisfied customers

3,000+ satisfied customers, all topics, A+ work

< Previous | Next >

Related Homework Questions
Just wanted to see if you would be interested in helping me
Hello Again! Just wanted to see if you would be interested in helping me with two more programs? I will attach the Program outlines and the Word documents. Please let me know if you would like to help… read more
George Sibiya
George Sibiya
PhD
217 satisfied customers
6. How many worksheets display in the Excel window when you
6. How many worksheets display in the Excel window when you create a new blank workbook? A. 3 B. 2 C. 4 D. 1 Student Answer: A Answer: Incorrect Reference: Objective 2.17. What would be a situation in… read more
AnswersByEric
AnswersByEric
Software Developer
Associate Degree
37 satisfied customers
Question 18 of 20: Select the best answer for the question.
Question 18 of 20 : Select the best answer for the question. 18. What size paper should you use for a legal document? A. 3″ × 5″ B. 8½″ × 11″ C. 7¼″ × 10½″ D. 8½″ × 14″… read more
JA Engineer
JA Engineer
Broadcast Engineer
Diploma (Honors)
163 satisfied customers
I need help with Exam Number: 00701400 Lesson Name: General
I need help with Exam Number: 00701400Lesson Name: General Math I, Study Unit 2 Pennfoster test… read more
GLENN
GLENN
Master of Mathematics
343 satisfied customers
Answer all three questions and don't exceed 600 words for
Answer all three questions and don't exceed 600 words for each answer while using at least two references to support your answers for each question adopting APA citation in the text and in the referen… read more
F. Naz
F. Naz
Chartered Accountant
CA Finalist & Completed B.com
2,161 satisfied customers
QUESTION 1 A(n) _________________ policy are codified as
QUESTION 1A(n) _________________ policy are codified as standards and procedures that are used when configuring or maintaining systems.0.10000 points Save AnswerQUESTION 2In systems analysis and desig… read more
F. Naz
F. Naz
Chartered Accountant
CA Finalist & Completed B.com
2,161 satisfied customers
I need all the questions answered inthis pdf! I need all
I need all the questions answered inthis pdf! I need all sixty questions on all 21 pages answered!… read more
Steven, M.Acc.
Steven, M.Acc.
Instructor
Master\u0027s Degree
252 satisfied customers
Exam Number: 584002RR I need all t he questions answered in
Exam Number: 584002RR I need all t he questions answered in excel in this pdf file now! Asap!… read more
The-PC-Guy
The-PC-Guy
Bachelor\u0027s Degree
629 satisfied customers
How do you differentiate between an expression and an
How do you differentiate between an expression and an equation? Provide an example of each, where the two are either related to or similar to each other. … read more
GLENN
GLENN
Master of Mathematics
343 satisfied customers
Duane will use an open system LAN because he knows the open
Duane will use an open system LAN because he knows the open system will support varieties of hardware and software components made by different vendors. Steve will use a closed system LAN because he k… read more
F. Naz
F. Naz
Chartered Accountant
CA Finalist & Completed B.com
2,161 satisfied customers
IT 278 Network Administration 1. Server roles and features
IT 278 Network Administration 1. Server roles and features can be added and updated through both a GUI installation and a Server Core installation. In a short essay, explain how to use Windows PowerSh… read more
David L.
David L.
Bachelor\u0027s Degree
6 satisfied customers
For LogicPro only. need help with this debugging to input it
For LogicPro only.need help with this debugging to input it into raptor// A high school is holding a recycling competition // This program allows a user to enter a student's // year in school (1 throu… read more
LogicPro
LogicPro
Engineer
Bachelor of Technology
5,731 satisfied customers
I need the answer key to penn american literature, 986174RR
I need the answer key to penn foster american literature, 986174RR 986175RR 986176RR 986177RR 986178RR … read more
GLENN
GLENN
Master of Mathematics
343 satisfied customers
For LogicPro only * Reading data strings from a file *
For LogicPro only* Reading data strings from a file * Convert from int based container to templates or generics based * Accommodate dynamic resizing using this algorithm: 1. Starting with a dynamic si… read more
LogicPro
LogicPro
Engineer
Bachelor of Technology
5,731 satisfied customers
Question 1 of 20: Select the best answer for the question.
Question 1 of 20 : Select the best answer for the question. 1. For what type of document would you use the landscape page orientation? A. Three-column brochure B. Business letter C. Legal contract D. … read more
Cher
Cher
JustAnswer Expert & Mentor;Teacher/Tutor
Masters Degree
1,381 satisfied customers
5 - 5 x 5 +5. What is the answer to 5 - 5 x 5 + 5? Only that
no, only that two people using order of operations keeps getting different answers… read more
GLENN
GLENN
Master of Mathematics
343 satisfied customers
Only for F.Naz Tutor. Kindly help with a research report,
Only for F.Naz Tutor.Kindly help with a research report, the links is http://www.mediafire.com/file/bmcea6dt278nw8w/report.txt… read more
F. Naz
F. Naz
Chartered Accountant
CA Finalist & Completed B.com
2,161 satisfied customers
If I did not look at the description which says 4 cpu cores
if I did not look at the description which says 4 cpu cores and 6 gpu core to make TEN I wonder if you can bundle the two to make an advertisement that says 10 core I also have others in the same fiel… read more
Pete
Pete
Engineer
Bachelor\u0027s Degree
1,124 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x