Search found 34 matches

by Liam Giffin 2B
Sat Mar 11, 2017 2:16 pm
Forum: *Alcohols
Topic: Alcohol 2-methyl-2-butanol [ENDORSED]
Replies: 1
Views: 452

Re: Alcohol 2-methyl-2-butanol [ENDORSED]

The 2-butanol indicates that the functional group is attached to the second carbon atom, but the second carbon atom is different from the secondary carbon atom. A secondary carbon atom is bonded to two other carbon atoms and a tertiary carbon atom is bonded to 3 other carbon atoms. The second carbon...
by Liam Giffin 2B
Sat Mar 11, 2017 2:12 pm
Forum: *Alcohols
Topic: Alcohol
Replies: 1
Views: 232

Re: Alcohol

It means that the carbon atom it is attached to is attached to two other carbons
by Liam Giffin 2B
Sun Mar 05, 2017 11:54 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Ratio of Rate Constants (Energy Barriers)
Replies: 2
Views: 369

Re: Ratio of Rate Constants (Energy Barriers)

Well the rate constant is part of what determines the rate of the reaction. A larger rate constant corresponds to a faster reaction. If the energy barrier is lower then less energy is required for the reaction to occur, so the reaction will be faster and thus k must be larger.
by Liam Giffin 2B
Sun Mar 05, 2017 11:51 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Reaction Cone
Replies: 1
Views: 257

Re: Reaction Cone

I don't really know much at all about this topic, but it is my understanding that the reaction cone is the range of angles at which a collision can occur in order for the reaction to occur. So the 2 Br atoms have to collide in a particular arrangement in order for the reaction to occur, the reaction...
by Liam Giffin 2B
Wed Mar 01, 2017 12:15 am
Forum: *Nucleophiles
Topic: Polarization and nucleophile strength
Replies: 3
Views: 533

Re: Polarization and nucleophile strength

Larger atoms in the same group are more polarizable. For example Bromine is more polarizable than Fluorine, so Br- is a stronger nucleophile than F-. I'm pretty sure the trend isn't as definite as for some other things, but definitely the elements towards the bottom right of the period table are the...
by Liam Giffin 2B
Tue Feb 21, 2017 12:29 am
Forum: General Rate Laws
Topic: 15.19 Homework
Replies: 1
Views: 260

Re: 15.19 Homework

Technically they are both correct. The solution manual just chose to convert the given values from mmol/L to mol/L before doing calculations, which results in the answer in the solution manual. If you just leave those value in mmol/L then you will get a different answer, but both are technically cor...
by Liam Giffin 2B
Mon Feb 20, 2017 8:25 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Book problems for quiz 2?
Replies: 1
Views: 262

Re: Book problems for quiz 2?

I would also do any problems after 79, because those mostly cover things that will be covered on the quiz. Definitely do 101 because it appears to me to be the only pre-equilibrium question in the book hw and that is something we need to know for the quiz.
by Liam Giffin 2B
Mon Feb 20, 2017 12:53 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2
Replies: 3
Views: 447

Re: Quiz 2

I'm not 100% certain but those things you listed all appear after page 73 in the course reader, so I don't think we will be assessed on anything from those sections on quiz 2.
by Liam Giffin 2B
Sun Feb 19, 2017 8:32 pm
Forum: Phase Changes & Related Calculations
Topic: Quiz 2
Replies: 3
Views: 499

Re: Quiz 2

6 questions
by Liam Giffin 2B
Wed Feb 15, 2017 12:13 am
Forum: General Science Questions
Topic: Sig Figs
Replies: 5
Views: 1025

Re: Sig Figs

I think the answer to this is that it depends. Sometimes you will be given the temperature just so that you know that some given values are valid. For example, the standard enthalpies of formation are usually given at 25 degrees C, so often the only reason you are given the temp is so that you know ...
by Liam Giffin 2B
Wed Feb 15, 2017 12:07 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Midterm 2014 Question 8
Replies: 4
Views: 446

Re: Midterm 2014 Question 8

So I'm not sure exactly where your issue is occurring, but I am not running into the same issue as you. When I use the formula ln(k)=\frac{nFE^{\circ}}{RT} the units cancel and I am left with a unitless K with the same value as listed in the book. In this case we use n as a pure number, so i...
by Liam Giffin 2B
Tue Feb 14, 2017 11:44 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Textbook Question 14.13b
Replies: 1
Views: 195

Re: Textbook Question 14.13b

In the given equation both Ce4+ and Ce3+ are listed as aqueous which means that they are in the same solution. If both the oxidized and the reduced forms are listed as aqueous then that automatically means they are in the same solution as a part of the galvanic cell.
by Liam Giffin 2B
Tue Feb 14, 2017 11:37 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Determine Cathode and Anode
Replies: 2
Views: 350

Re: Determine Cathode and Anode

This is mostly correct, because you want your cell potential to be positive, which will only occur if the reaction with the greater reduction potential occurs at the cathode and the reaction with the smaller reaction potential occurs at the anode. The only thing you said that I believe is incorrect ...
by Liam Giffin 2B
Mon Feb 06, 2017 12:20 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: 14.27
Replies: 1
Views: 258

14.27

For question 14.27 in the textbook I don't understand why we can't just add the potentials of reactions A and B (shown in solution manual answer) together. The problem and solution manual solution are shown below.
by Liam Giffin 2B
Sun Feb 05, 2017 2:53 pm
Forum: Balancing Redox Reactions
Topic: Acidic vs. Basic Solution
Replies: 2
Views: 304

Acidic vs. Basic Solution

On questions involving balancing are redox reaction in a basic or acidic solution will we always be told whether the reaction is occurring in an acidic or basic solution or is there some way that we should be able to figure that out ourselves?
by Liam Giffin 2B
Fri Feb 03, 2017 8:45 pm
Forum: Balancing Redox Reactions
Topic: Formulas
Replies: 1
Views: 226

Re: Formulas

This is a little bit of a tough question to answer but I'll do my best and hopefully it will be somewhat helpful. 1) E^{\circ}cell=E^{\circ}(cathode) - E^{\circ}(anode) This is used to calculate the standard potential of a cell when we know the potentials for both the oxidation and t...
by Liam Giffin 2B
Sat Jan 28, 2017 9:00 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: HW #9.85
Replies: 1
Views: 283

HW #9.85

Question 9.85 in the textbook says "Potassium nitrate dissolves readily in water, and its enthalpy of solution is +34.9 kJ* mol^{-1} ." Part C of the question then asks, "Is the entropy change of the system primarily a result of changes in the positional disorder or thermal disorder?&...
by Liam Giffin 2B
Fri Jan 27, 2017 11:56 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Question 9.23
Replies: 1
Views: 218

Question 9.23

Question 9.23 in the home work asks, "Which would you expect to have a higher molar entropy at T=0, single crystals of BF_{3} or of COF_{2} ? Why? The solution manual answer says " COF_{2} . COF_{2} and BF_{3} are both trigonal planar molecules, but it would be possible for the molecule to...
by Liam Giffin 2B
Wed Jan 25, 2017 5:47 pm
Forum: Administrative Questions and Class Announcements
Topic: 14A Final Exams
Replies: 1
Views: 386

14A Final Exams

In previous emails from Dr. Lavelle he said that our final exams from 14A would be available to be picked up in Young Hall 4006 this week. Is that still the case? At what times can we pick them up?
by Liam Giffin 2B
Tue Jan 17, 2017 7:00 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: HW Problem 8.99
Replies: 1
Views: 308

HW Problem 8.99

I am having trouble understanding problem 8.99 in the homework. I understand everything in the solution manual for the problem (problem and manual are pictured below) up until the point where they start finding the enthalpy of the reaction using tabulate enthalpies of formation. I understand where t...
by Liam Giffin 2B
Sun Jan 15, 2017 8:15 pm
Forum: Calculating Work of Expansion
Topic: Problem 8.3
Replies: 3
Views: 362

Re: Problem 8.3

Never mind, I see that that conversion is derived on page 263 of the book.
by Liam Giffin 2B
Sun Jan 15, 2017 8:13 pm
Forum: Calculating Work of Expansion
Topic: Problem 8.3
Replies: 3
Views: 362

Re: Problem 8.3

I was also having trouble with this problem. I do not understand where the 1Latm=101.325J conversion comes from. Where does that conversion come from?
by Liam Giffin 2B
Fri Dec 02, 2016 5:37 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Sig Figs in pH
Replies: 2
Views: 352

Re: Sig Figs in pH

I have a somewhat similar question. It appears in the solutions manual and previous finals solutions that in calculations involving a kpa of kpb that the sig figs of the kpa or kpb are ignored in the solution. Is this true?
by Liam Giffin 2B
Wed Nov 30, 2016 10:07 pm
Forum: *Titrations & Titration Calculations
Topic: Chapter 13 #35
Replies: 3
Views: 627

Re: Chapter 13 #35

I also had trouble with this problem. In part B the solutions manual finds the concentrations of CH3COOH and CH3CO2- after neutralization, which makes sense to me. Then it sets up an ICE box to solve for the hydronium ion concentration. This works, but I also got the same answer when I plugged in th...
by Liam Giffin 2B
Fri Nov 18, 2016 12:02 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: HW 11.67
Replies: 3
Views: 372

Re: HW 11.67

I have posted the full question and answer below. I also don't understand how they are able to just "push the reaction" to the left. How are they able to do that and what is the procedure for going about that?
by Liam Giffin 2B
Thu Nov 17, 2016 11:20 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.11 [ENDORSED]
Replies: 1
Views: 195

11.11 [ENDORSED]

Problem #11 says, "A 0.10 mol sample of pure ozone, O 3 , is placed in a sealed 1.0 L container and the reaction 2O 3 (g) \rightleftharpoons 3O 2 (g) is allowed to reach equilibrium. A 0.50 mol sample of pure ozone is placed in a second 1.0 L container at the same temperature and allowed to rea...
by Liam Giffin 2B
Wed Nov 09, 2016 9:23 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Homework 17.33
Replies: 7
Views: 765

Re: Homework 17.33

For part a of 33 the lewis structure I got (pictured below) would suggest that it is a bidentate ligand. Why is that incorrect?
by Liam Giffin 2B
Fri Nov 04, 2016 5:40 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Molecular orbital theory question
Replies: 2
Views: 303

Re: Molecular orbital theory question

Electrons in an anti-bonding molecular orbital do not participate in bond formation, so electrons in an anti-bonding MO would correspond to lone pairs on an atom. However electrons in bonding orbitals are the electrons that are used to form sigma and pi bonds. Electrons fill the bonding orbitals fir...
by Liam Giffin 2B
Wed Oct 26, 2016 10:18 pm
Forum: Lewis Structures
Topic: 3.103
Replies: 1
Views: 255

3.103

Question 3.103 form the book is shown in the picture below, along with the answer for part C of the question. I do not understand how you arrive at the solution manual answer for part C (pictured below) from what you are given in the book. It says that 2 protons are added and then the book answer ad...
by Liam Giffin 2B
Wed Oct 19, 2016 9:27 pm
Forum: Ionic & Covalent Bonds
Topic: Question 3.57 B
Replies: 1
Views: 185

Question 3.57 B

For question 3.57 in the homework the book asks you to "write the Lewis structure, including typical contributions to the resonance structure (where appropriate, allow for the possibility of octet expansion, including double bonds in different positions), for; (b) a hydrogen sulfite ion. I star...
by Liam Giffin 2B
Wed Oct 12, 2016 9:21 pm
Forum: Trends in The Periodic Table
Topic: Chapter 2, Homework Problem 2.93
Replies: 2
Views: 407

Chapter 2, Homework Problem 2.93

I'm having trouble with question 2.93 in the chapter 2 homework. I have attached the question and the solution manual answer. The way I see it, Na has the larger atomic radius, so it must be represented initially by circle B and Cl has the smaller atomic radius so it must correspond to circle A. Thi...
by Liam Giffin 2B
Thu Oct 06, 2016 12:10 am
Forum: Limiting Reactant Calculations
Topic: Quiz 1 prep. #8-Limiting reagent [ENDORSED]
Replies: 3
Views: 1155

Re: Quiz 1 prep. #8-Limiting reagent [ENDORSED]

I'm confused, because in the balanced equation you, Alicia, posted, the first product you have is 2 N_{2} , but in the unbalanced equation you are given the first product is NO (g), not just N (g) or N_{2} (g). Problem 9 of the fundamentals self test in the workbook is basically the same and I was h...
by Liam Giffin 2B
Fri Sep 30, 2016 2:18 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Formula [ENDORSED]
Replies: 3
Views: 500

Re: Rydberg Formula [ENDORSED]

I have an add on question. For question 1.15 in the homework it just gives us a wavelength of 102.6 nm and asks us to find the final and initial energy levels n that lead to this spectral line. I don't see any way to do this without using the Rydberg equation v=R(\frac{1}{n^{2}}-\frac{1}{n^{2}}&...

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