Sample quiz paper set 6 (differential rate equation)
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This document contains a chemistry quiz with 4 questions: 1) Calculating the rate of appearance of product C given the rate of disappearance of reactant A 2) Calculating the rate of production of ozone given the rate of reaction of oxygen 3) Determining the reaction orders from a rate law expression 4) Predicting how the rate will change if the concentration of a second-order reactant increases
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![−
3. For the reaction, H2O2 (aq) + 3 I−
(aq) + 2 H+
(aq) → 2 H2O (l) + I3 (aq)
The rate law was experimentally determined to be Rate = k[H2O2][I−
]
a. What is the reaction order in terms of H2O2?
b. What is the reaction order in terms of I−
?
c. What is the reaction order in terms of H+
?
d. What is the overall reaction order of this reaction?
4. If a reaction is second order in B and the concentration of B increased from 0.0850 M to
0.2975 M, what should happen to the rate?](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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ENV 3001 Name:___________________
Final Exam Date: June 18, 2015
1. a b c d e f _____________
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Answer all questions in the space provided and transfer your answers to the answer sheet.
1-2. The dilution factor P of an unseeded mixture of liquid wastewater is 0.03. The initial DO of the
mixture is 10.0 mg/L. After 5 days, DO has dropped to 1.0 mg/L.
Assuming: Reaction rate constant k = 0.22 day
-1
.
1. The 5-day BOD of the waste is most nearly:
a. 600 mg/L
b. 500 mg/L
c. 400 mg/L
d. 300 mg/L
e. 200 mg/L
f. other, write your answer _________________
2. The ultimate BOD of the liquid waste would be most nearly:
a. 550 mg/L
b. 450 mg/L
c. 350 mg/L
d. 240 mg/L
e. 150 mg/L
f. other, write your answer _________________
3-4. A water sample has the following analysis:
Concentration (mg/L) Atomic/ionic weight
Ca
+2
80 40
Mg
+2
30 24.4
Na
+
72 23
K
+
6 39
Cl
-
100 35.5
SO4
-2
201 96
HCO3
-
162 61
3. Total hardness of the water is most nearly (as mg/L as CaCO3):
a. 479 mg/L
b. 344 mg/L
c. 323 mg/L
d. 200 mg/L
e. 135 mg/L
f. other, write your answer _________________
4. Total carbonate harness is most nearly (as mg/L as CaCO3):
a. 479 mg/L
b. 441 mg/L
c. 323 mg/L
d. 266 mg/L
e. 133 mg/L
f. other, write your answer _________________
5. NO2 concentration in air is measures as 0.25 ppm at 25
o
C and 1 atm pressure. The concentration
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3
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Atomic weights: N: 14 O: 16
a. 770
b. 640
c. 520
d. 470
e. 320
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Duke University Nicholas School of the Environment
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Student Name: _____________________________________________________
(Please Print)
STATEMENT FOR EXAMS
Duke University is a community dedicated to scholarship, leadership, and service
and to the principles of honesty, fairness, respect, and accountability. Citizens of
this community commit to reflect upon and uphold these principles in all
academic and nonacademic endeavors, and to protect and promote a culture of
integrity.
The Pledge
Students affirm their commitment to uphold the values of the Duke University
community by signing a pledge that states:
To uphold the Duke Community Standard:
I will not lie, cheat, or steal in my academic endeavors;
I will conduct myself responsibly in all my endeavors; and
I will act if the Standard is compromised.
I have adhered to the Duke Community Standard in completing this exam.
________________________________________ _______________________
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ENVIRON 239/EOS 239 FINAL EXAM
40 points
DUE BY: 5 pm, Thu May 2
IMPORTANT
1. Read the questions carefully.
2. Make sure that your answers precisely address the question - no credit will be given for
material that does not address the question.
3. Write clearly, and do not clutter up the page. The progression of your answer should be
self-evident. If I cannot figure out what you write, you will not get credit for your answer.
4. The exam is open-book – you may consult your class notes, the lecture slides, and the
readings. You are not allowed to consult any other sources or search the web for answers.
5. Late exams will be penalized 8 points (20% of total) for each day or part of day late.
SUBMISSION INSTRUCTIONS
Upload your completed final exam in electronic form to Sakai Drop Box – name the file
Final_LastName.pdf or Final_LastName.docx. Or slide a hard copy under my office
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program for Question 8.
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Briefly describe the two specific reasons that we discussed in class as to why HOx and
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Northern Hemisphere occasionally contribute to elevated levels of NOx at the surface at
high northern latitudes. Given the relatively short chemical lifetime of NOx (1-2 days),
this seems surprising till one considers organic nitrates. Using PAN (peroxyace.
Chem 101 Spring 2017 Name _______________________________.docx
Chem 101 / Spring 2017 Name: ______________________________________
Exam 2 // 198pts Lectures H through L (199)
1. Multiple Choice: Choose the best answer and put the number in the blank provided. (45pts)
A. _______ Compounds that have only non-metal element and only covalent bonds are
1. Didactic 2. Nobel Compounds 3. Ionic 4. Molecular
B._______ The Atomic Mass on the periodic table is:
1. The mass of the protons in an atom 2. The mass of a mole of atoms of a given element
3. The mass of an atom. 4. The Mass of a mole of protons
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1. Dipole-dipole, 2. London dispersion, 3. Ionic, 4. Hydrogen bonding
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1. N2O6 2. C6H12O6 3. C2H4 4. SO3
E. _______Atoms of the Non-metal elements generally form ions by
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3. Gaining electrons, forming positive ions 4. Gaining electrons, forming negative ions
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G. _______ A Polar Covalent bond has a
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1. Molecular Formula 2. Atomic Formula 3. Thermodynamic Formula 4. Empirical Formula
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1. H2O, 2. CO2 3. SO2 4. MgF2 5. NH3
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1. It is the best at forming Ionic Compounds 2. Its electronegativity is mid-range
3. Its electronegativity is very large 4. Its electronegativity is very small
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1. Have poor solubility in water 2. Usually have low melting points
3. Conduct electricity when in solution 4. Readily form molecules
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1. Ionic 2. Covalent 3. Electron sea model 4. Dipole / Dipole 5. London
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1. Ionic 2. London 3. Electron sea model 4. Covalent 5. Dipole / Dipole
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1. Attract 2. Repel 3. Negate 4. Dissociate
/48
Chem 101 / Spring 2017 Name: ______________________________________
Exam 2 // 198pts Lectures H through L (199)
Q. ______ In the kinetic molecular theory gas particles are
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IIT- JEE Main 2016 Paper solution
We at 'Apex Institute' are committed to provide our students best quality education with ethics. Moving in this direction, we have decided that unlike other expensive and 5star facility type institutes who are huge investors and advertisers, we shall not invest huge amount of money in advertisements. It shall rather be invested on the betterment, enhancement of quality and resources at our center.
We are just looking forward to have 'word-of-mouth' publicity instead. Because, there is only a satisfied student and his/her parents can judge an institute's quality and it's faculty members coaching.
Those coaching institutes, who are investing highly on advertisements, are actually, wasting their money on it, in a sense. Rather, the money should be invested on highly experienced faculty members and on teaching gears.
We all at 'Apex' are taking this initiative to improve the quality of education along-with each student's development and growth.
Committed to excellence...
With best wishes.
S . Iqbal
( Motivator & Mentor)
General Chemistry I Laboratory Experiment PERIODIC TREN
General Chemistry I
Laboratory Experiment
PERIODIC TRENDS IN GROUP II
REPORT SHEET
Name: _____________________________ Date: __________
Determine the Reactivity of Alkaline Earth Salts
Table 1 – Observations of reactivity of Alkaline Earth Salts
Metal
Describe the reaction with water.
Be
Mg
Ca
Sr
Ba
Order of reactivity from most reactive to least reactive (use > symbol):
Is the data consistent with the order of the Group 2 elements on the Periodic Table?
REPORT SHEET: Describe the reaction with waterBe: Describe the reaction with waterMg: Describe the reaction with waterCa: Describe the reaction with waterSr: Describe the reaction with waterBa: Is the data consistent with the order of the Group 2 elements on the Periodic Table 1: Text1: Text2:
General Chemistry I
Laboratory Experiment
Periodic Trends in Group II
Objective
In this experiment, the trend in one of the several periodic properties for group II of the Periodic Table will be determined.
Introduction
Elements in the same group of the Periodic Table have similar chemical and physical properties that gradually change as one goes from one element in the group to the next. By observing the trends in properties, the elements can be arranged in the order in which they appear in the Periodic Table. In this experiment we will study the properties of the elements in Group II (2), the alkaline earth metals.
Group 2 – The Alkaline Earth Metals
The alkaline earth elements are in Group 2 of the Periodic Table. In this experiment Be, Mg, Ca, Ba, and Sr will be studied. All of the alkaline earth metals are M2+ cations (Mg2+, Ca2+, etc.) when they combine with nonmetals in ionic compounds and when they are in aqueous solution. The reactivity of the cations of beryllium, barium, calcium, magnesium, and strontium will be examined. The metal cations will be reacted with water. The information will be used to rank the reactivity of the metal cations.
If a solution containing one of these cations is mixed with a solution containing an anion, the alkaline earth salt will precipitate if the compound containing those two ions is insoluble. The anions used for testing the alkaline earth cations in this experiment is OH
M(s) + H2O(l) M(OH)2(s) + H2(g)
The solubilities of the compounds of the alkaline earth cations and the anions show a smooth trend consistent with the order of the cations in the Periodic Table. That is, as we go from one end of the alkaline earth family to the other, the solubilities of the hydroxide salts either gradually increase or decrease. By determining the solubility trends in this experiment, the order of the alkaline earths in the Periodic Table will be able to be confirmed.
Pre-Lab Assignment
As preparation for this experiment, do the following:
· Open the prelab folder on Blackboard for this experiment and follow the instructions to prepare for this experiment.
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ENV 3001 Final Exam_Summer 2015.pdfENV 3001 Name_.docx
ENV 3001 Final Exam_Summer 2015.pdf
ENV 3001 Name:___________________
Final Exam Date: June 18, 2015
1. a b c d e f _____________
2. a b c d e f _____________
3. a b c d e f _____________
4. a b c d e f _____________
5. a b c d e f _____________
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35. a b c d e f _____________
Answer all questions in the space provided and transfer your answers to the answer sheet.
1-2. The dilution factor P of an unseeded mixture of liquid wastewater is 0.03. The initial DO of the
mixture is 10.0 mg/L. After 5 days, DO has dropped to 1.0 mg/L.
Assuming: Reaction rate constant k = 0.22 day
-1
.
1. The 5-day BOD of the waste is most nearly:
a. 600 mg/L
b. 500 mg/L
c. 400 mg/L
d. 300 mg/L
e. 200 mg/L
f. other, write your answer _________________
2. The ultimate BOD of the liquid waste would be most nearly:
a. 550 mg/L
b. 450 mg/L
c. 350 mg/L
d. 240 mg/L
e. 150 mg/L
f. other, write your answer _________________
3-4. A water sample has the following analysis:
Concentration (mg/L) Atomic/ionic weight
Ca
+2
80 40
Mg
+2
30 24.4
Na
+
72 23
K
+
6 39
Cl
-
100 35.5
SO4
-2
201 96
HCO3
-
162 61
3. Total hardness of the water is most nearly (as mg/L as CaCO3):
a. 479 mg/L
b. 344 mg/L
c. 323 mg/L
d. 200 mg/L
e. 135 mg/L
f. other, write your answer _________________
4. Total carbonate harness is most nearly (as mg/L as CaCO3):
a. 479 mg/L
b. 441 mg/L
c. 323 mg/L
d. 266 mg/L
e. 133 mg/L
f. other, write your answer _________________
5. NO2 concentration in air is measures as 0.25 ppm at 25
o
C and 1 atm pressure. The concentration
of NO2 in µg/m
3
is most nearly:
Atomic weights: N: 14 O: 16
a. 770
b. 640
c. 520
d. 470
e. 320
f. other, write your answer _________________
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Duke University Nicholas School of the Environment Honor C.docx
Duke University Nicholas School of the Environment
Honor Code Cover Sheet for Exams
Student Name: _____________________________________________________
(Please Print)
STATEMENT FOR EXAMS
Duke University is a community dedicated to scholarship, leadership, and service
and to the principles of honesty, fairness, respect, and accountability. Citizens of
this community commit to reflect upon and uphold these principles in all
academic and nonacademic endeavors, and to protect and promote a culture of
integrity.
The Pledge
Students affirm their commitment to uphold the values of the Duke University
community by signing a pledge that states:
To uphold the Duke Community Standard:
I will not lie, cheat, or steal in my academic endeavors;
I will conduct myself responsibly in all my endeavors; and
I will act if the Standard is compromised.
I have adhered to the Duke Community Standard in completing this exam.
________________________________________ _______________________
(Student Signature) Today’s Date
ENVIRON 239/EOS 239 FINAL EXAM
40 points
DUE BY: 5 pm, Thu May 2
IMPORTANT
1. Read the questions carefully.
2. Make sure that your answers precisely address the question - no credit will be given for
material that does not address the question.
3. Write clearly, and do not clutter up the page. The progression of your answer should be
self-evident. If I cannot figure out what you write, you will not get credit for your answer.
4. The exam is open-book – you may consult your class notes, the lecture slides, and the
readings. You are not allowed to consult any other sources or search the web for answers.
5. Late exams will be penalized 8 points (20% of total) for each day or part of day late.
SUBMISSION INSTRUCTIONS
Upload your completed final exam in electronic form to Sakai Drop Box – name the file
Final_LastName.pdf or Final_LastName.docx. Or slide a hard copy under my office
door. Also note that you should upload to Sakai Drop Box or email to me your PLAS
program for Question 8.
Question 1 (3 points)
Briefly describe the two specific reasons that we discussed in class as to why HOx and
NOx destroy O3 chemically in the stratosphere, but generally produce O3 chemically in
the troposphere.
Question 2 (2 points)
Briefly explain why anthropogenic VOC emissions control measures in the 1990s did not
significantly reduce regional surface ozone pollution in the U.S.
Question 3 (2 points)
There is evidence that surface NOx emissions from the industrialized midlatitudes of the
Northern Hemisphere occasionally contribute to elevated levels of NOx at the surface at
high northern latitudes. Given the relatively short chemical lifetime of NOx (1-2 days),
this seems surprising till one considers organic nitrates. Using PAN (peroxyace.
Chem 101 Spring 2017 Name _______________________________.docx
Chem 101 / Spring 2017 Name: ______________________________________
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1. Multiple Choice: Choose the best answer and put the number in the blank provided. (45pts)
A. _______ Compounds that have only non-metal element and only covalent bonds are
1. Didactic 2. Nobel Compounds 3. Ionic 4. Molecular
B._______ The Atomic Mass on the periodic table is:
1. The mass of the protons in an atom 2. The mass of a mole of atoms of a given element
3. The mass of an atom. 4. The Mass of a mole of protons
C._______ What is the major attractive force in a compound like NaCl?
1. Dipole-dipole, 2. London dispersion, 3. Ionic, 4. Hydrogen bonding
D. _______ Which of the following represents an Empirical Formula
1. N2O6 2. C6H12O6 3. C2H4 4. SO3
E. _______Atoms of the Non-metal elements generally form ions by
1. Losing electrons, forming positive ions 2. Losing electrons, forming negative ions
3. Gaining electrons, forming positive ions 4. Gaining electrons, forming negative ions
F. _______ The Atomic Mass Unit (AMU) is the mass of
1. A Mole of Carbon 2. A Hydrogen Atom 3. A Carbon Atom 4. An Electron
G. _______ A Polar Covalent bond has a
1. Random Charge 2. Positive Charge 3. Negative Charge 4. Dipole
H._______ Reaction ratios in gas phase reactions can be measured by
1. Temperature 2. Color 3. Volume 4. Time
I. ______ The formula showing the total number of each elements in a chemical formula is the
1. Molecular Formula 2. Atomic Formula 3. Thermodynamic Formula 4. Empirical Formula
J. ______ Which of the following would have the highest melting temperature?
1. H2O, 2. CO2 3. SO2 4. MgF2 5. NH3
K. ______ Carbon is very good at forming covalent bonds because
1. It is the best at forming Ionic Compounds 2. Its electronegativity is mid-range
3. Its electronegativity is very large 4. Its electronegativity is very small
L. ______ Ionic Compounds
1. Have poor solubility in water 2. Usually have low melting points
3. Conduct electricity when in solution 4. Readily form molecules
M. _____ The weakest of the intermolecular forces are:
1. Ionic 2. Covalent 3. Electron sea model 4. Dipole / Dipole 5. London
N. _____ Which statement is true about Hydrogen Bonds?
1. They are stronger than covalent bonds 2. They are the weakest of all interactions
3. They are stronger than ionic bonds 4. They are weaker then covalent bonds
O. _____ The physical properties of metals result from the inter-particle forces called:
1. Ionic 2. London 3. Electron sea model 4. Covalent 5. Dipole / Dipole
P. ______ Ionic compounds dissolve in water because the ions in the compound
1. Attract 2. Repel 3. Negate 4. Dissociate
/48
Chem 101 / Spring 2017 Name: ______________________________________
Exam 2 // 198pts Lectures H through L (199)
Q. ______ In the kinetic molecular theory gas particles are
1. Far apart 2 ...
IIT- JEE Main 2016 Paper solution
We at 'Apex Institute' are committed to provide our students best quality education with ethics. Moving in this direction, we have decided that unlike other expensive and 5star facility type institutes who are huge investors and advertisers, we shall not invest huge amount of money in advertisements. It shall rather be invested on the betterment, enhancement of quality and resources at our center.
We are just looking forward to have 'word-of-mouth' publicity instead. Because, there is only a satisfied student and his/her parents can judge an institute's quality and it's faculty members coaching.
Those coaching institutes, who are investing highly on advertisements, are actually, wasting their money on it, in a sense. Rather, the money should be invested on highly experienced faculty members and on teaching gears.
We all at 'Apex' are taking this initiative to improve the quality of education along-with each student's development and growth.
Committed to excellence...
With best wishes.
S . Iqbal
( Motivator & Mentor)
General Chemistry I Laboratory Experiment PERIODIC TREN
General Chemistry I
Laboratory Experiment
PERIODIC TRENDS IN GROUP II
REPORT SHEET
Name: _____________________________ Date: __________
Determine the Reactivity of Alkaline Earth Salts
Table 1 – Observations of reactivity of Alkaline Earth Salts
Metal
Describe the reaction with water.
Be
Mg
Ca
Sr
Ba
Order of reactivity from most reactive to least reactive (use > symbol):
Is the data consistent with the order of the Group 2 elements on the Periodic Table?
REPORT SHEET: Describe the reaction with waterBe: Describe the reaction with waterMg: Describe the reaction with waterCa: Describe the reaction with waterSr: Describe the reaction with waterBa: Is the data consistent with the order of the Group 2 elements on the Periodic Table 1: Text1: Text2:
General Chemistry I
Laboratory Experiment
Periodic Trends in Group II
Objective
In this experiment, the trend in one of the several periodic properties for group II of the Periodic Table will be determined.
Introduction
Elements in the same group of the Periodic Table have similar chemical and physical properties that gradually change as one goes from one element in the group to the next. By observing the trends in properties, the elements can be arranged in the order in which they appear in the Periodic Table. In this experiment we will study the properties of the elements in Group II (2), the alkaline earth metals.
Group 2 – The Alkaline Earth Metals
The alkaline earth elements are in Group 2 of the Periodic Table. In this experiment Be, Mg, Ca, Ba, and Sr will be studied. All of the alkaline earth metals are M2+ cations (Mg2+, Ca2+, etc.) when they combine with nonmetals in ionic compounds and when they are in aqueous solution. The reactivity of the cations of beryllium, barium, calcium, magnesium, and strontium will be examined. The metal cations will be reacted with water. The information will be used to rank the reactivity of the metal cations.
If a solution containing one of these cations is mixed with a solution containing an anion, the alkaline earth salt will precipitate if the compound containing those two ions is insoluble. The anions used for testing the alkaline earth cations in this experiment is OH
M(s) + H2O(l) M(OH)2(s) + H2(g)
The solubilities of the compounds of the alkaline earth cations and the anions show a smooth trend consistent with the order of the cations in the Periodic Table. That is, as we go from one end of the alkaline earth family to the other, the solubilities of the hydroxide salts either gradually increase or decrease. By determining the solubility trends in this experiment, the order of the alkaline earths in the Periodic Table will be able to be confirmed.
Pre-Lab Assignment
As preparation for this experiment, do the following:
· Open the prelab folder on Blackboard for this experiment and follow the instructions to prepare for this experiment.
· Watch the video in the folder. Use to fill in the data sheet ...
ANALYSIS THE DEFICIT OF DISSOLVED OXYGEN IN AL_HILLA RIVER ACCORDING TO WASTE...
The dissolved oxygen levels and quality of water play an important role in supporting aquatic life. In this paper we collected number of samples from AL_Hilla River near AL-Hilla city center about 40 km from the beginning of the river to investigate the deficit of the DO concentration in the river and the pollution level in it.
Similar to Sample quiz paper set 6 (differential rate equation) (20)
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Sample quiz paper set 6 (differential rate equation)
- 1. ANSWER ALL QUESTIONS 1. For the reaction below, if substance A is disappearing at a rate of 1.82 x 10–2 mol/Ls, at what rate is C appearing? 3 A + 3 B → 5 C + 2 D 2. Ozone (O3) is produced in the stratosphere by the chemical reaction shown below. If at a given instant, molecular oxygen (O2) is reacting at a rate of 2.17 x 10–5 mol/Ls, at what rate is ozone being produced? 3 O2 (g) → 2 O3 (g) Chemistry Unit Session 2013/2014 Semester 2 Sample QUIZ Paper NAME : ________________________________________________ MATRIC NUMBER : ________________________________________________ CLASS : ______________________________________________ NAME OF TUTOR : _____________________________________________
- 2. − 3. For the reaction, H2O2 (aq) + 3 I− (aq) + 2 H+ (aq) → 2 H2O (l) + I3 (aq) The rate law was experimentally determined to be Rate = k[H2O2][I− ] a. What is the reaction order in terms of H2O2? b. What is the reaction order in terms of I− ? c. What is the reaction order in terms of H+ ? d. What is the overall reaction order of this reaction? 4. If a reaction is second order in B and the concentration of B increased from 0.0850 M to 0.2975 M, what should happen to the rate?
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