Search found 31 matches

by Minu Reddy
Sun Mar 19, 2017 10:27 am
Forum: Administrative Questions and Class Announcements
Topic: Final Exam Details and Review Sessions Winter 2017
Replies: 114
Views: 13013

Re: Final Exam Details and Review Sessions Winter 2017

Hi Everyone,
I was wondering if we need to know how to draw a boat conformation?

Thank you
by Minu Reddy
Mon Mar 13, 2017 10:14 pm
Forum: General Science Questions
Topic: steric and torsional strain
Replies: 2
Views: 437

Re: steric and torsional strain

So is it correct to assume that due to the electron electron repulsion that occurs in the eclipsed conformation, there is always torsional strain ONLY in the eclipsed conformation?

Thank you!
by Minu Reddy
Tue Mar 07, 2017 9:47 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 15260

Re: Quiz 3 Winter 2017

Can someone please help me to understand when to use iso-, neo-, sec-, and tert, when doing IUPAC naming?

Thank you
by Minu Reddy
Mon Feb 27, 2017 2:45 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Pre-equilibrium
Replies: 3
Views: 356

Re: Pre-equilibrium

The pre equilibrium approach is used when you are trying to write the rate law for a mechanism and there is a fast step followed by a slow step. You know that the overall rate law is dependent on the rate law of the slowest step, but since the slowest step is preceded by a fast step then there may b...
by Minu Reddy
Mon Feb 13, 2017 9:03 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Winter 2013 Midterm Q2A
Replies: 10
Views: 699

Re: Winter 2013 Midterm Q2A

The reason you add less ice is because the orange juice has a lower heat capacity and therefore does not need as much heat to be cooled.
by Minu Reddy
Mon Feb 13, 2017 9:01 pm
Forum: Phase Changes & Related Calculations
Topic: Gas Constants and other constants
Replies: 1
Views: 194

Gas Constants and other constants

Hi Everyone,
I was wondering how you would covert the gas constant and other constants that have units in K to units in C?

Thank you so much!
by Minu Reddy
Mon Feb 06, 2017 4:24 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Concentration Cell
Replies: 1
Views: 175

Concentration Cell

Hi everyone,
I was wondering if someone could please explain how in a concentration cell, the standard potential difference is = to 0V when the components are at different concentrations?

Thank you
by Minu Reddy
Tue Jan 31, 2017 10:27 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1 Preparation Answers
Replies: 130
Views: 13264

Re: Quiz 1 Preparation Answers

Hi Everyone,
I have a question on #10.

So when I did the problem, I divided 200/20, but I was wondering if someone can please explain the conversion factor to get the answer on the key?

Thank you
by Minu Reddy
Mon Jan 23, 2017 10:05 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Caliometry
Replies: 1
Views: 206

Caliometry

Hi everyone,

I was wondering if someone could please explain to me how caliometry allows us to calculate specific heat capacity?

Thank you so much,
Minal Reddy
by Minu Reddy
Mon Jan 16, 2017 12:47 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy: State Properties
Replies: 2
Views: 259

Re: Enthalpy: State Properties

Hi everyone, I have a question regarding elements that are in their most stable form. Specifically, I know that Oxygen for example is in its most stable form when it is O2 and likewise for the rest of the diatomic molecules, but I was wondering if we need to know other examples of elements in their ...
by Minu Reddy
Mon Jan 09, 2017 1:59 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz Policy
Replies: 2
Views: 306

Quiz Policy

Hi Everyone,
I was wondering if anyone happens to know if the same policy (the workbook points can replace the lowest grade) that was used for the quizzes in Chem 14A with Dr. Lavelle is going to be used this quarter as well?

Thank you so much
by Minu Reddy
Sat Dec 03, 2016 1:31 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Charge of ligand
Replies: 1
Views: 434

Re: Charge of ligand

Dr. Lavelle recently answered this question. But it is based on the concept that that top left nitrogen has two bonds and two lone pairs therefore the formal charge is 5-6=-1.
by Minu Reddy
Sat Dec 03, 2016 1:29 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Henderson-Hasselbalch Equation
Replies: 3
Views: 566

Re: Henderson-Hasselbalch Equation

The HH equation is used when considering the idea for a buffer that a weak acid and its conjugate base or a weak base and a conjugate acid must be in equal concentrations for optimum buffering capacity. Therefore when you solve the equation considering their equal concentrations, you will get that P...
by Minu Reddy
Tue Nov 29, 2016 12:46 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Treating Systems that have Small Equilibrium Constants
Replies: 4
Views: 517

Re: Treating Systems that have Small Equilibrium Constants

I'm so sorry if this question has already been asked. But am I correct in remembering that Dr. Lavelle mentioned if the k value is less than 10^-4 then it is ok to approximate? Or do you just have to look at if the value of x is less than 5% of the initial concentration?

Thank you!
by Minu Reddy
Wed Nov 23, 2016 2:20 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Exothermic and Endothermic
Replies: 4
Views: 706

Re: Exothermic and Endothermic

When the reaction is exothermic and you add heat to the products side, and if there is an increase in heat then wouldn't the reaction shift to the left not to the right?


Thank you
by Minu Reddy
Tue Nov 22, 2016 11:04 am
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: Atomic Orbitals in MO theory
Replies: 1
Views: 604

Atomic Orbitals in MO theory

When we draw the atomic orbitals in an MO diagram for anions or cations do we show the added or removed electrons in our atomic orbitals or just in our molecular orbitals?

Thank you! :)
by Minu Reddy
Tue Nov 22, 2016 11:00 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Drawings for Final
Replies: 3
Views: 423

Re: Drawings for Final

If you are asking in regards to the vsepr structures, I would say that we do not need to know anything outside of what was covered in the course reader and on the midterm.
by Minu Reddy
Mon Nov 14, 2016 8:12 am
Forum: Ideal Gases
Topic: Ideal Gas Law and Equilibrium Constant
Replies: 7
Views: 686

Re: Ideal Gas Law and Equilibrium Constant

Ok thank you very much.

But isn't this a concept that we have not covered yet?
by Minu Reddy
Fri Nov 11, 2016 8:02 pm
Forum: Ideal Gases
Topic: Ideal Gas Law and Equilibrium Constant
Replies: 7
Views: 686

Ideal Gas Law and Equilibrium Constant

Hi, I was wondering if someone could please explain that if a question asks how an increase in the pressure or a decrease in the volume of a reaction will affect the direction the reaction favors how do you figure it out? For an example, can someone please explain Fall 2014, Question 6. What conditi...
by Minu Reddy
Mon Nov 07, 2016 11:23 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelates
Replies: 2
Views: 368

Chelates

I am a little confused on chelates and the monodentates and polydentates. Are chelates and polydentates ligands that can form a coordinate covalent bond with a transition metal in more than 1 place? In other words, the chelate is a name for a single ligand that has more than one electron rich atom t...
by Minu Reddy
Sun Nov 06, 2016 3:10 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: What is MO theory for? [ENDORSED]
Replies: 20
Views: 6557

Re: What is MO theory for? [ENDORSED]

I have a very basic question regarding drawing the molecular orbital diagrams.

Just to confirm, we draw the diagram using the number of valence electrons not the atomic number. But the atomic number determines which type of molecular orbital diagram we draw. (Z>=8 or Z<8)?

Thank you.
by Minu Reddy
Mon Oct 31, 2016 9:41 am
Forum: Octet Exceptions
Topic: Ground state
Replies: 2
Views: 281

Re: Ground state

Remember that when trying to deal with isoelectronic atoms, it is often the cations and the anions that cause atoms to be isoelectronic. For example when you have a cation, you remove electrons and when you have an anion you add electrons. The adding and removing of electrons is based on the charge ...
by Minu Reddy
Mon Oct 31, 2016 9:38 am
Forum: Dipole Moments
Topic: Polarity
Replies: 5
Views: 457

Re: Polarity

To correctly determine the polarity of a molecule, it is very important to draw the molecule according to its actual shape because attempting to determine the polarity solely by looking at the lewis structure can cause you cancel out dipole moments and get a nonpolar molecule when the molecule is ac...
by Minu Reddy
Mon Oct 24, 2016 11:24 am
Forum: Electronegativity
Topic: Ionization Energy
Replies: 1
Views: 346

Re: Ionization Energy

In general, the trend of ionization energy is that is increases across a period and decreases down a group. The highest ionization energy elements exist on the upper right hand corner of the periodic table. All you have to remember for the exceptions is that Nitrogen and elements with a half filled ...
by Minu Reddy
Mon Oct 24, 2016 11:19 am
Forum: Lewis Structures
Topic: Central Atom
Replies: 5
Views: 563

Re: Central Atom

Remember that the ionization energy increases across a period and decreases across a group.

So you would want to pick elements that are on the bottom left hand corner of the periodic table.
by Minu Reddy
Mon Oct 17, 2016 9:05 pm
Forum: Trends in The Periodic Table
Topic: Electronegativity and Electron Affinity. [ENDORSED]
Replies: 3
Views: 1200

Re: Electronegativity and Electron Affinity. [ENDORSED]

Could anyone please remind me what the periodic trend is for electronegativity?

I was also wondering what the difference between electronegativity and ionization energy is?

Thank you so much
by Minu Reddy
Mon Oct 17, 2016 8:54 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Octet Rule Exception [ENDORSED]
Replies: 3
Views: 540

Re: Octet Rule Exception [ENDORSED]

The reason is because the third row in the periodic table corresponds to the third energy level which is n=3. Given that n=3, you can have l values of 0,1,2. l=2 corresponds to a d sub level and because there are 5 orbitals in a d sub level, you can have a total of 10 electrons which is why elements...
by Minu Reddy
Tue Oct 11, 2016 11:22 pm
Forum: Photoelectric Effect
Topic: Module question
Replies: 1
Views: 300

Re: Module question

I remember that this is a two part question so you have to use the threshold energy from the first part of the experiment!

You can't solve the problem without this value:)
by Minu Reddy
Tue Oct 11, 2016 11:20 pm
Forum: Balancing Chemical Reactions
Topic: Determining States of Matter in Reactions
Replies: 7
Views: 722

Re: Determining States of Matter in Reactions

I spoke to some TA's regarding the same questions about listing the states of matter, and they said that for the purposes of this quiz, you should mainly focus on the balancing part of the equation. But I don't think that it hurts if you list the states of matter if you know them!
by Minu Reddy
Wed Oct 05, 2016 12:43 pm
Forum: DeBroglie Equation
Topic: Post Module Question [ENDORSED]
Replies: 3
Views: 414

Re: Post Module Question [ENDORSED]

Perhaps, there is an error in your calculations because when you multiply the given wavelength by the mass of the electron you get a value that is 6.63*10^-39. Then when you divide "h" Planck's constant by that value you must get 1*10^5. In regards to if the answer is reasonable, I know th...
by Minu Reddy
Sun Sep 25, 2016 12:01 pm
Forum: SI Units, Unit Conversions
Topic: Including Units in a Problem
Replies: 3
Views: 394

Including Units in a Problem

I have a question regarding including si units when we are solving a problem on any form of assessment?
Is it necessary to include units at all times or only in the final answer?

Thnak you very much.

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