General Chemistry 2. Sample Exam Chapter 16 17 Suny Potsdam Sample Exam

1654 words - 7 pages

Name ____________________________________ General Chemistry II
Sample Exam
Chapter 14 Sample Problems
1. In the reaction H2O2(aq) → H2O(l) + 0.5O2(g), the initial concentration of H2O2 is 0.2546 M, and the initial rate of
reaction is 9.32 10-4 M s-1. What will be [H2O2] at t = 35 s?
2. For the gas phase decomposition of hydrogen iodide at 700 K 2 HI(g) →H2(g) + I2(g) the average rate of disappearance
of HI over the time period from t = 0 s to t = 797 s is found to be 5.28 x 10-4 M/s. What is the average rate of appearance
of H2 over the same time period?
3. A reaction has the rate law Rate = k[A][B]2. What is the order of the reaction?
4. In the first-order decomposition of dinitrogen pentoxide at 335 K,
N2O5(g) → 2NO2(g) + 0.5O2(g)
if we start with a 2.50 g sample of N2O5 at 335 K and have 1.50 g remaining after 109 s, (a) What is the value of the
rate constant k? (b) What is the half-life of the reaction? (c) What mass of N2O5 will remain after 5.0 min?
5. The decomposition of hydrogen iodide on a gold surface at 150C: HI(g) ⇄ H2(g) + I2(g) is zero order in HI with a
rate constant of 1.20 x 10-4 Ms-1. If the initial concentration of HI is 0.110 M, what is the concentration of HI after
776 seconds have passed
6. A general reaction is the formation of molecule C from two reactant molecules, A and B.
A + B → C
The reaction was run multiple times at constant temperature using different initial concentrations of the two reactants.
The initial rates obtained are included in the table below.
[A], mol/L [B], mol/L rate, mol/(L-min)
Trial 1 0.350 0.880 0.180
Trial 2 0.770 0.880 0.360
Trial 3 0.350 1.76 0.360
Trial 4 0.967 0.651 0.368
What is the reaction order with respect to A? What is the reaction order with respect to B? Determine the rate
equation and the value of the rate constant.
7. The rate of the reaction between CO and NO2 at 540 K
CO(g) + NO2(g) →CO2(g) + NO(g)
was measured starting with various concentrations of CO and NO2.
[CO], mol/L [NO2], mol/L rate, mol/(L-min)
Trial 1 5.10 x 10-4 3.50 x 10-5 3.4 x 10-8
Trial 2 5.10 x 10-4 7.00 x 10-5 6.8 x 10-8
Trial 3 5.10 x 10-4 1.75 x 10-5 1.7 x 10-8
Trial 4 1.02 x 10-3 3.50 x 10-5 6.8 x 10-8
Trial 5 1.53 x 10-3 3.50 x 10-5 10.2 x 10-8
What is the reaction order with respect to A? What is the reaction order with respect to B? Determine the rate
equation and the value of the rate constant.
8. Rate constants for the first-order decomposition of acetonedicarboxylic acid
CO(CH2COOH)2(aq) → CO(CH3)2(aq) + 2 CO2(g)
are k = 4.75 x 10-4 s-1 at 293 K and k = 1.63 x10-3 s-1 at 303 K. What is the activation energy, Ea, for this reaction?
9. The gas phase decomposition of hydrogen peroxide at 400 C
H2O2 (g) → H2O(g) + O2(g)
is second order in H2O2 with a rate constant of 0.650 M
-1 s-1. If the initial concentration of H2O2 is 0.118 M, the
concentration of H2O2 will be M after 56.7 seconds have passed.
10. In a study of the decomposition of ammonia on a platinum surface at 856 C
NH3 → 1/2 N2 + 3/2 H2
the concentration of NH3 was followed as a function of time.
It was found that a graph of [NH3] versus time in seconds gave a straight line with a slope of -2.15 x 10
-6 M s-1 and a
y-intercept of 2.38 x 10-3 M.
Based on this plot, determine the reaction order for NH3 and the rate constant for the reaction in M s
-1.
11. In a study of the decomposition of ammonia on a tungsten surface at 1100 C
NH3 → 1/2 N2 + 3/2 H2
the following data were obtained:
[NH3], M 7.05 x 10
-3 3.53 x 10-3 1.77 x 10-3 8.85 x 10-4
seconds 0 441 661 772
Hint: It is not necessary to graph these data.
a. The observed half life for this reaction when the starting concentration is 7.05x 10-3 M is ___________________
s and when the starting concentration is 3.53 x 10-3 M is ___________________ s.
b. The average rate of disappearance of NH3 from t = 0 s to t = 441 s is ___________________ M s
-1.
c. The average rate of disappearance of NH3 from t = 441 s to t = 661 s is ___________________ M s
-1.
d. Based on these data, the rate constant for this order reaction is ___________________ M s-1.
12. The following mechanism for the gas phase reaction of H2 and ICl that is consistent with the observed rate law is:
step 1 slow: H2(g) + ICl(g) → HCl(g) + HI(g)
step 2 fast: ICl(g) + HI(g) → HCl(g) + I2(g)
a. What is the equation for the overall reaction? Use the smallest integer coefficients possible.
b. Which species acts as a catalyst? Enter formula. If none, write none:
c. Which species acts as a reaction intermediate? Enter formula. If none, write none:
d. Complete the rate law for the overall reaction that is consistent with this mechanism.
Rate =
13. A student proposed the following mechanism for the gas phase reaction of fluorine with chlorine dioxide.
step 1 fast: 2 ClO2 → Cl2O4
step 2 slow: Cl2O4 + F2 → 2 FClO2
a. What is the equation for the overall reaction? Use the smallest integer coefficients possible.
b. Which species acts as a catalyst? Enter formula. If none, write none:
c. Which species acts as a reaction intermediate? Enter formula. If none, write none:
d. Complete the rate law for the overall reaction that is consistent with this mechanism.
Rate =
Chapter 15 Sample Problems
14. Write the equilibrium-constant expression for the following reaction.
CO2 (g) + 2H2 (g) ⇄ CH3OH (g)
15. Given the following: I) 2NO(g) ⇄ N2O(g) + 1/2 O2(g) Kc = 5.9 x 10
12 II) N2(g) + O2(g) ⇄ 2NO(g) Kc = 4.1 x 10
-31
Find the value of the equilibrium constant for the following equilibrium reaction: N2(g) + 1/2 O2(g) ⇄ N2O(g)
16. Which of the following expressions is the correct equilibrium-constant expression for the reaction below?Write the
equilibrium-constant expression for the following reaction. CO2 (s) + H2O (l) ⇄ H
+ (aq) + HCO-3 (aq)
17. For the reaction: 2 SO2(g) + O2(g) ⇄ 2 SO3(g), Kc = 6.9 x 10
24 at 25 C. If a reaction vessel is filled with these gases,
such that [SO2] = 6.0 M, [O2] = 6.0 M and [SO3] = 6.0 M, what is the reaction quotient? In which direction will the
reaction proceed?
18. Acetic acid is a weak acid that dissociates into the acetate ion and a proton in aqueous solution:
HC2H3O2 (aq) ⇄ C2H3O
-
2 (aq) + H
+ (aq)
At equilibrium at 25 C a 0.100 M solution of acetic acid has the following concentrations: [HC2H3O2] = 0.0990 M,
[C2H3O
-
2] = 1.33 x 10
-3 M and [H+] = 1.33 x 10-3 M.
a. Find the equilibrium constant,
b. Does this equilibria favor reactants or products?
19. A mixture, containing 0.0750 M HCl(g) and 0.0330 M O2(g) is allowed to come to equilibrium at 480C.
4HCl(g) + O2(g) ⇄ 2Cl2(g) + 2H2O(g)
At equilibrium [Cl2] = 0.030 M. What is the value of Kc?
20. The water-gas shift reaction is important in several chemical processes, such as the production of H2 for fuel cells.
This reaction can be written as follows:
H2(g) + CO2(g) ⇄ H2O(g) + CO (g)
K = 0.106 at 700 K. If a mixture of gases that initially contains 0.0150 M H2 and 0.0150 M CO2 is allowed to equilibrate
at 700 K, what are the final concentrations of all substances present?
21. Consider the following reaction where Kc = 1.29 x 10
-2 at 600 K.
COCl2(g) ⇄ CO(g) + Cl2(g)
A reaction mixture was found to contain 0.127 moles of COCl2(g), 5.17 x 10
-2 moles of CO(g), and 4.24 x 10-2 moles
of Cl2(g), in a 1.00 liter container.
Is the reaction at equilibrium? If not, what direction must it run in order to reach equilibrium?
Hint, calculate the reaction quotient, Qc.
22. Consider the following reaction where Kc = 1.80 x 10
-4 at 298 K.
NH4HS(s) ⇄ NH3(g) + H2S(g)
A reaction mixture was found to contain 5.46 x 10-2 moles of NH4HS(s), 8.16 x 10
-3 moles of NH3(g), and 1.34 x
10-2 moles of H2S(g), in a 1.00 liter container.
Is the reaction at equilibrium? If not, what direction must it run in order to reach equilibrium?
Hint, calculate the reaction quotient, Qc.
23. The equilibrium constant, Kc, for the following reaction is 5.10 x 10
-6 at 548 K.
NH4Cl(s) ⇄ NH3(g) + HCl(g)
If an equilibrium mixture of the three compounds in a 6.31 L container at 548 K contains 3.52 mol of NH4Cl(s) and
0.497 mol of NH3, calculate the number of moles of HCl present.
24. A student ran the following reaction in the laboratory at 607 K:
CO(g) + Cl2(g) ⇄ COCl2(g)
When she introduced 0.201 moles of CO(g) and 0.233 moles of Cl2(g) into a 1.00 liter container, she found the
equilibrium concentration of COCl2(g) to be 0.163 M.
Calculate the equilibrium constant, Kc, she obtained for this reaction.
25. The equilibrium constant, Kc, for the following reaction is 9.52 x 10
-2 at 350 K.
CH4 (g) + CCl4 (g) ⇄ 2 CH2Cl2 (g)
Calculate the equilibrium concentrations of reactants and product when 0.369 moles of CH4 and 0.369 moles of
CCl4 are introduced into a 1.00 L vessel at 350 K.

RELATED

Chemistry regents review for 2018 exam - AMSU chemistry - Regents review

4484 words - 18 pages provided. Students are required to stay in the examination room for a minimum of 2 hours from the time the test is distributed. Exam Date:_________________________________ There are 12 specific topics covered on the test. In addition to these you will be required to demonstrate math and graphing skills. The 12 topics covered are: The Atom Moles and Stoichiometry Nuclear Chemistry Solutions Bonding Kinetics and Equilibrium Matter Acids, Bases and

mgmt1000, the class notes for the chapter 1 which is prepared for the midterm exam 1 - guelph - note paper

708 words - 3 pages Chapter 1 for Midterm1 Define the nature of Canadian business and identify its main goals; Global economic systems, the factors of production, input and output markets; The interactions between business and government in Ca. Demand and supply · Business- an organization that produces or sells goods or services in an effort to make a profit. (Canada, the world’s top country to do business · Profit= Revenues - Expenses · Not-for-profit

AQA English Language sample paper 2 1hr 45min - AGS - Paper

1705 words - 7 pages AQA Sample Paper: GCSE English Language Paper 2: Writers’ viewpoints and perspectives Time allowed: 1 hour 45 minutes · The marks for questions are shown in brackets. · The maximum mark for this paper is 80. · There are 40 marks for Section A and 40 marks for Section B. · You are reminded of the need for good English and clear presentation in your answers. · You will be assessed on the quality of your reading in Section A. · You will be assessed

exam 2 from the statistic class - psych 2317 - psych 2317

811 words - 4 pages . $350,000 b. $150,000 c. $75,000 d. $500,000 16. Should a governor die, resign, or be removed from office, or should a governor-elect refuse to take office or be permanently unable to fill the office, who would be the first to succeed him or her____B____? a. the president pro tempore of the Senate b. the lieutenant governor c. the Speaker of the House d. the attorney general 17. What is the only constitutionally prescribed method of forcing a

philosophy exam 2: philosophy 1301 - philosophy 1301 - philosophy

1822 words - 8 pages Alondra Reta Dr. Robinson Phil 1301_003 9 November 2017 Exam 2 Section 1: 1. What is Searle’s Chinese room argument? What is that supposed to tell us about artificial intelligence? The Chinese room argument gives us a brief explanation on how a “mind is to brain as program is to hardware” (Page 5). The mind seems to be plugged in to wires that can track how the brain is functioning through a program that can send out data on written paper. Since

sample answers Language paper 1 and Language paper 2 - SCHOOL - essAY

2540 words - 11 pages not directly towards the girl, but towards society in general, which is completely justified. Paper 2 Q2 – 8 marks In source A the child enjoys activities more closely related to human interaction than the child in source B. The child in source A seems to thrive from ‘running up to people and waiting for them to twang his lips like a ruler on a table’ and ‘[barking] gibberish in the middle of the room’. The child appears to enjoy playing with

French Speaking Exam- Questions and Answers. Theme 2 - Deanery High School - Exam Prep.

403 words - 2 pages French Gcse Theme 2 Est-ce que tu aimes habiter ici ? Pourquoi ? / Pourquoi pas? Do you like to live here? Qu'est-ce que tu as fait le week-end dernier dans ta ville / ton village ? What did you do last weekend in your town / village? Qu'est-ce qu'on pourrait faire pour améliorer ta région ? What could we do to improve your area? Qu’est-ce qu’il y a à faire dans ta ville/ ton village ? What to do in your city / village? L’année prochaine

An Investigation about Titration being used in Vinegar - Assignment

501 words - 3 pages /standard titrant=% acetic acid in vinegar. Divide each sample titrant average by the standard titrant average. 1%acetic acid Trial 1 Trial 2 Trial 3 # drops of 0.1M NaOH 16 30 80 White vinegar Trial 1 Trial 2 Trial 3 # drops of 0.1M NaOH 120 108 90 Apple Cider Vinegar Trial 1 Trial 2 Trial 3 # drops of 0.1M NaOH 109 116 130 % acetic acid in white vinegar:2.52 % acetic acid in apple cider vinegar:2.82 In this experiment, my hypothesis was incorrect, as they should have been at least 5%. Both of the vinegar had less than 3% of acetic acid, which isn’t what my hypothesis stated.

Leadership 251 assignment questions for first five chapters of textbook - Leadership 251 - Assignment

1750 words - 7 pages INDP 251 Exam 1 Summer Session: MULTIPLE CHOICE: Select one and only one answer for each question. Mark your answers on the answer sheet provided and submit it to the D2L dropbox entitled Exam 1. Please insure you fill out all the questions and keep them in the proper order. (Each Question is worth 4 Points) Chapter 1: 1. Power is described as a. A relational concern for both leaders and followers b. Use of force over others to manipulate them

accounts final exam review conestoga sem1 - gbbbb - eductaional

556 words - 3 pages Acct 1030 Foundations of Accounting FINAL Exam Review Chapters 7 - 12 1. Total exam is out of 120 marks. 2. One question is 13 multiple choice questions worth 13 marks. Questions come from chapters 7 to 12. Review online lab quizzes in the Review Lab Practice section within AME. You will need to know some ratios from chapter 12 for some questions as follows: quick ratio, debt to equity ratio, gross margin ratio, and inventory ratios (inventory

diffusion

1434 words - 6 pages (RS) 33 24 F EXAM #2 27 M Mollusks, Annelids (RS) 33 Annelids, Mollusks 29 W Arthropods (RS) 33 31 F Echinoderms and Chordates (RS) 33 3 Nov M Vertebrates (RS) 34 Arthropods 5 W Animal metabolism (RS) 40 7 F Circulation and Gas Exchange 42 Date Day Lecture Topic Chapter Lab Activity 10 M Osmoregulation and excretion (RS) 44 No labs - Veterans Day (Tuesday, Nov

Streetcar Named Desire Reflection

773 words - 4 pages general concepts and theoretical perspectives associated with some of the major areas in the field of psychology.COURSE REQUIREMENTS:Final grades will be based on research credits (5 required points), two tests and two exams (one mid-term and one final). All exams will be multiple-choice.EVALUATION:Test #1 20 pointsTest #2 20 pointsMidterm Exam 30 pointsFinal Exam 25 pointsExperiments 5 points --You MUST participate in designated on-campus

RLST 365

3036 words - 13 pages ) contemporary studies of religion informed by evolutionary and cognitive sciences. COURSE REQUIREMENTS (1) Reflective paper on reading assignment. Instructions forthcoming (1000-1200 words) (10 %) Due Tuesday, September 23. (2) Midterm exam, essay format. (25 %) Thursday, October 16. (3) Paper topic due: Thursday, Oct. 30. (4) Preliminary outline of and bibliography for you research paper. Typed. (5%). Due Tues. Nov. 11. (5) Research paper (3000-4500

high school essay exit exam are fair or not - CRC ENGWR 300 - argumentative

1163 words - 5 pages mistakenly informed that they had failed the Minnesota exit exam. Cornell et al. surveyed 911 of the 7,898 students who were erroneously informed they failed, only to be told they passed by a small margin several months later. Surveying the students about the experience 2 years after this event, they found that a large majority of students reported adverse emotional reactions, including depression (64%) and embarrassment (64%). Moreover, 4% of those

Psychology ! Exam preparation for final - PSC 1 - Research

418 words - 2 pages PSC 1 Exam 3 “Study List” Fall 2018 Please note that this list is meant to give you a general idea of lecture topics, concepts, and terms worth an in-depth review. In approaching your studying, you should still go over all your notes. Focus on places where the text and the notes overlap, places where the notes depart from the text, and look over the quizzes. The General Psychology Resources document also includes video clips that we watched in