Search found 68 matches

by Monica Habashy 3A
Mon Mar 13, 2017 2:16 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Green textbook 3.5-8
Replies: 1
Views: 284

Re: Green textbook 3.5-8

It depends on the atomic masses of the halogen. The heavier one gets priority.
by Monica Habashy 3A
Mon Mar 13, 2017 2:16 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: A in the Arrhenius equation
Replies: 2
Views: 369

Re: A in the Arrhenius equation

A is the pre exponential factor. Usually it's the same in throughout a type of reaction. You could be asked to find it if you are given all the other values.
by Monica Habashy 3A
Mon Mar 13, 2017 2:15 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: When to Use Z and E?
Replies: 4
Views: 438

Re: When to Use Z and E?

You use them when you notice the trends in the way they are ordered in terms of priority.
by Monica Habashy 3A
Wed Mar 08, 2017 5:17 pm
Forum: Administrative Questions and Class Announcements
Topic: Torsional Strain
Replies: 2
Views: 406

Torsional Strain

I'm a little confused as to what torsional strain is. Can anyone explain it?
by Monica Habashy 3A
Mon Mar 06, 2017 9:27 pm
Forum: General Science Questions
Topic: Types of energy profiles
Replies: 5
Views: 709

Re: Types of energy profiles

for the Gibbs free energy diagrams, do we look at delta G of activation for the second step from the intermediates to the transition state or in terms of the reactants to the transition state.
by Monica Habashy 3A
Mon Mar 06, 2017 6:53 pm
Forum: *Cycloalkenes
Topic: Tert-Butyl vs Isobutyl
Replies: 1
Views: 351

Re: Tert-Butyl vs Isobutyl

iso is used for the general shape of (CH3)2CH, tert is when you have a T shape made up of carbon atoms.
by Monica Habashy 3A
Mon Mar 06, 2017 6:52 pm
Forum: General Science Questions
Topic: Types of energy profiles
Replies: 5
Views: 709

Types of energy profiles

How many types of energy profiles are there? I know there's an energy profile in terms of Gibbs free energy and one in terms of potential energy...are there any others we need to be aware of? What are the differences between the Gibbs free energy and the potential energy ones?
by Monica Habashy 3A
Mon Mar 06, 2017 6:51 pm
Forum: *Nucleophiles
Topic: Determining nucleophile vs. Electrophile
Replies: 1
Views: 545

Re: Determining nucleophile vs. Electrophile

The overall characteristic depends on the central atom and since C is in this case an electrophile because it is slightly positive, the molecule is therefore electrophilic.
by Monica Habashy 3A
Mon Mar 06, 2017 6:48 pm
Forum: *Electrophiles
Topic: Halogens
Replies: 4
Views: 704

Re: Halogens

Halogens are electron rich which is why they are nucleophiles.
by Monica Habashy 3A
Mon Mar 06, 2017 6:46 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: quiz 2 #11
Replies: 1
Views: 304

Re: quiz 2 #11

Did you use the ln(k2/k1)=-Ea/R(1/T2-1/T1) formula? Cause when you do that with the known values you get 5611j/mol as your activation energy. Then you use that value with the same equation, replacing one of your K values and its corresponding T values for the 700K and solving for K which gives you t...
by Monica Habashy 3A
Mon Mar 06, 2017 12:11 pm
Forum: Administrative Questions and Class Announcements
Topic: Naming
Replies: 1
Views: 246

Naming

Can an "iso" group be at the end of a carbon chain or does it always have to be in the middle?
by Monica Habashy 3A
Mon Feb 27, 2017 6:57 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz number 3
Replies: 5
Views: 664

Quiz number 3

Will quiz number 3 cover the kinetics stuff that we reviewed last week or will it be strictly organic chemistry?
by Monica Habashy 3A
Mon Feb 20, 2017 4:46 pm
Forum: First Order Reactions
Topic: Slope of k
Replies: 3
Views: 490

Re: Slope of k

Second order reactions are 1/A vs time therefore the slope increases as concentration decreases which is why the slop for that is positive.
by Monica Habashy 3A
Mon Feb 20, 2017 4:44 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: WHat is the unit of k
Replies: 4
Views: 538

Re: WHat is the unit of k

The units of the rate constant vary depending on the reaction order.
by Monica Habashy 3A
Mon Feb 20, 2017 4:43 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Quiz 2
Replies: 1
Views: 325

Re: Quiz 2

Yes, Dr. Lavelle posted the answers under the "Quiz 2 Winter 2017" post.
by Monica Habashy 3A
Mon Feb 20, 2017 4:42 pm
Forum: Administrative Questions and Class Announcements
Topic: Rate law of rxn mechanisms
Replies: 1
Views: 239

Rate law of rxn mechanisms

When do we use the steady step approach vs the pre equilibrium approach?
by Monica Habashy 3A
Wed Feb 15, 2017 1:06 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Book problem 14.55
Replies: 2
Views: 297

Re: Book problem 14.55

Why did they use water for the other half reaction?
by Monica Habashy 3A
Mon Feb 13, 2017 6:54 pm
Forum: Administrative Questions and Class Announcements
Topic: Units?
Replies: 1
Views: 244

Re: Units?

I don't think you get marked off for writing J or KJ unless the question specifies that you give it to one form or the other. Also it doesn't affect the sig figs, those primarily depend on the values given in the question.
by Monica Habashy 3A
Mon Feb 13, 2017 6:52 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Standard Molar Entropy
Replies: 1
Views: 421

Re: Standard Molar Entropy

The heavier the molecule the greater the entropy. The less symmetry a molecule has the higher the entropy. So if you were to compare CH4 and CH2Cl2...CH2Cl2 would have a higher entropy because there is more disorder associated with the lack of symmetry.
by Monica Habashy 3A
Mon Feb 13, 2017 6:50 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Practice midterm 2016 #8A
Replies: 1
Views: 286

Re: Practice midterm 2016 #8A

You look at the cell potentials. Whichever one is larger is the cathode and is therefore being reduced. The smaller, more negative value is the cell potential for the anode and is therefore oxidized.
by Monica Habashy 3A
Mon Feb 06, 2017 3:42 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic Cells
Replies: 1
Views: 247

Re: Galvanic Cells

I don't think we learned solubility product...
by Monica Habashy 3A
Wed Feb 01, 2017 5:21 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Units of H, S, G, U, q, and w
Replies: 1
Views: 255

Re: Units of H, S, G, U, q, and w

enthalpy kj/mol, entropy j/K*mol, free energy kj, heat kj, and work kj
by Monica Habashy 3A
Sun Jan 29, 2017 9:34 pm
Forum: Calculating Work of Expansion
Topic: Reversible vs Irreversible Expansion
Replies: 1
Views: 260

Re: Reversible vs Irreversible Expansion

Reversible means that the reaction can easily go back to its initial form completely. It's like 100% of the reverse reaction went back to create its initial reactants which is why there is no change in internal energy.
by Monica Habashy 3A
Sun Jan 29, 2017 9:19 pm
Forum: Administrative Questions and Class Announcements
Topic: Entropy
Replies: 2
Views: 334

Entropy

Will 1.0g of CH4 (g) have the same entropy has 2.0g of CH4 (g)? Or will the 2.0g of CH4 have greater entropy because entropy is an extensive property and therefore the increase in mass will result in greater disorder?
by Monica Habashy 3A
Sun Jan 29, 2017 1:46 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Quiz Prep #3
Replies: 1
Views: 235

Re: Quiz Prep #3

because the reaction is reversible and isothermal at variable pressure you use the 1=-nRTln(V2/V1) formula
by Monica Habashy 3A
Sun Jan 29, 2017 1:40 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: When to use which q= equation?
Replies: 1
Views: 408

Re: When to use which q= equation?

You use the one with mass when you are given or are trying to find the Specific Heat Capacity. The one with just CdeltaT is used when you are just trying to find or are given the Heat Capacity. And the Cp is the heat capacity at constant pressure.
by Monica Habashy 3A
Tue Jan 24, 2017 10:01 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Molar Heat Capacity
Replies: 2
Views: 290

Re: Molar Heat Capacity

Basically when you have constant volume of 1 atom of an ideal gas the molar heat capacity is 3/2R (R is rydberg's constant) Whereas if you have constant pressure of 1 atom of a gas the molar heat capacity is 5/2R. Now if you have linear molecules or non linear molecules these values differ. There's ...
by Monica Habashy 3A
Tue Jan 17, 2017 8:48 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: kJ vs. kJ per mole?
Replies: 3
Views: 422

Re: kJ vs. kJ per mole?

You use KJ per mole when you're finding the standard enthalpy of formation because it is the formation of 1 mol of a compound from its constituent elements. However, if you're just finding the enthalpy of a reaction you just use KJ. Also, my TA said that bond enthalpies can be written in KJ or KJ pe...
by Monica Habashy 3A
Fri Jan 13, 2017 4:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem Final [ENDORSED]
Replies: 6
Views: 1059

Re: Chem Final [ENDORSED]

I think you can pick them during week 3 of this quarter from 4006 Young Hall
by Monica Habashy 3A
Mon Jan 09, 2017 6:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Organic Chem Textbook
Replies: 1
Views: 318

Re: Organic Chem Textbook

I think we start organic chemistry towards the end of the quarter so probably by then.
by Monica Habashy 3A
Fri Dec 02, 2016 6:26 pm
Forum: Administrative Questions and Class Announcements
Topic: Ionic Radius
Replies: 1
Views: 316

Ionic Radius

Which would have the largest ionic radius? Cl- Br- I-
by Monica Habashy 3A
Wed Nov 30, 2016 3:54 pm
Forum: Administrative Questions and Class Announcements
Topic: Chemical Equilibria
Replies: 1
Views: 321

Chemical Equilibria

On page 457 question 11.35 there's a formula used to convert K to Kc, are we expected to know that for the final? Did we go over this in class?
by Monica Habashy 3A
Mon Nov 21, 2016 1:53 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp and Kc
Replies: 4
Views: 505

Re: Kp and Kc

Also for Kc you use these brackets: [ ] but for Kp you use normal brackets ( )
by Monica Habashy 3A
Mon Nov 14, 2016 9:15 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Gases
Replies: 1
Views: 273

Re: Gases

Use P when dealing with pressures and brackets when dealing with concentrations.
by Monica Habashy 3A
Mon Nov 14, 2016 9:15 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: How do you find the number of attachment possible?
Replies: 3
Views: 462

Re: How do you find the number of attachment possible?

ethylenediammine it's a bidentate because it has 2 nitrogens. Each nitrogen is bound to only 2 hydrogens which means they have a lone pair of electrons that can bond to the transition metal.
by Monica Habashy 3A
Mon Nov 14, 2016 9:13 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Having multiple possible concentrations [ENDORSED]
Replies: 1
Views: 288

Re: Having multiple possible concentrations [ENDORSED]

If both are positive you can figure out which one is correct by subtracting it from the initial concentration. If it gives you a negative initial concentration then you can disregard it cause the value is too large.
by Monica Habashy 3A
Mon Nov 14, 2016 9:12 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands [ENDORSED]
Replies: 2
Views: 321

Re: Ligands [ENDORSED]

Most of the time you can tell from the charge. Like F- Cl- OH- etc are all monodentates. SO42- is bidentate etc. Ethylenediammine is a bidentate cause there are 2 nitrogens each with one lone pair. So looking at the number of nitrogens can be a good indication of the number of bonds it can form.
by Monica Habashy 3A
Mon Nov 14, 2016 5:05 pm
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: 4.67
Replies: 2
Views: 535

Re: 4.67

You would calculate the bond orders for each one and so the one would the highest bond order would have the highest ionization energy because the bond is stronger. Then you would compare if the electrons are higher or lower in energy. Electrons in the higher energy orbitals mean that they are easier...
by Monica Habashy 3A
Mon Nov 14, 2016 2:48 pm
Forum: Administrative Questions and Class Announcements
Topic: Naming Coordination Compounds [ENDORSED]
Replies: 2
Views: 679

Naming Coordination Compounds [ENDORSED]

If there's an H2O outside the complex, do we refer to it as hydrate or aqua?

For example: K3[Fe(CN6)]3H2O
by Monica Habashy 3A
Mon Nov 14, 2016 10:36 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination number and oxidation [ENDORSED]
Replies: 1
Views: 277

Re: Coordination number and oxidation [ENDORSED]

The coordination number is the number of bonds formed. So from this you can deduce that the coordination number will be 6 because each NH3 will bind once and then there is a chlorine; this gives a total of 6. The oxidation number is solved by looking at the charges of each molecule. So the Cl2 charg...
by Monica Habashy 3A
Mon Nov 14, 2016 10:33 am
Forum: Naming
Topic: Ligands
Replies: 2
Views: 320

Re: Ligands

Ligands are electron rich species that bind to transition metal cations by forming coordinate covalent bonds
by Monica Habashy 3A
Mon Nov 14, 2016 10:32 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand Names
Replies: 3
Views: 330

Re: Ligand Names

I don't think so.
by Monica Habashy 3A
Mon Nov 14, 2016 10:32 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: M.O. Theory Conceptual Basis
Replies: 2
Views: 309

Re: M.O. Theory Conceptual Basis

We use the molecular orbital theory to give information about:
1. whether or not resonance structures exist (ex. if the bond order has a half in it (0.5, 2.5 etc) then the molecule has a resonance structure)
2. unpaired and paired electrons
3. bond energies
by Monica Habashy 3A
Sun Nov 13, 2016 6:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Ligands
Replies: 1
Views: 421

Ligands

Is nitrosyl (NO) bidentate?
by Monica Habashy 3A
Sun Nov 13, 2016 12:30 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Wrting the Chemical Formula for Coordination Compounds
Replies: 3
Views: 1362

Re: Wrting the Chemical Formula for Coordination Compounds

When writing out the chemical formula the order doesn't matter. However, when writing out the name then it's alphabetical.
by Monica Habashy 3A
Sun Nov 13, 2016 12:30 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Prep for Quiz 3
Replies: 1
Views: 264

Re: Prep for Quiz 3

From the PLF sessions with the UAs they said that these questions won't be asked on the quiz since we haven't gone over them yet. Dr. Lavelle said only the first 4 pages of the equilibrium stuff in the course reader will be on the quiz.
by Monica Habashy 3A
Sun Nov 13, 2016 12:29 pm
Forum: Naming
Topic: Naming Vanadium
Replies: 1
Views: 330

Re: Naming Vanadium

I think it's vanadate
by Monica Habashy 3A
Sun Nov 13, 2016 12:28 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentates
Replies: 1
Views: 264

Re: Polydentates

If it has lone pairs of electrons or a negative charge then it's most likely a polydentate and can bind to a metal in those regions.
by Monica Habashy 3A
Wed Nov 09, 2016 3:53 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: K vs Kc
Replies: 6
Views: 4284

Re: K vs Kc

If they give you pressure then it's Kp if they give you concentration then it's Kc
by Monica Habashy 3A
Wed Nov 09, 2016 3:52 pm
Forum: Naming
Topic: Right name for the complex ion
Replies: 2
Views: 358

Re: Right name for the complex ion

Using ferrate is the correct way but my TA said that we wouldn't need to use the latin names on quizzes/exams.
by Monica Habashy 3A
Wed Nov 09, 2016 3:49 pm
Forum: Administrative Questions and Class Announcements
Topic: Class on Wednesday November 23
Replies: 2
Views: 531

Re: Class on Wednesday November 23

I don't know if there will be class or not...but all the lectures are bruin cast.
by Monica Habashy 3A
Mon Nov 07, 2016 2:29 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: The Difference Between Sigma and Sigma* Levels
Replies: 1
Views: 309

Re: The Difference Between Sigma and Sigma* Levels

They have more energy because they are not bonded and therefore are more reactive. The bonded ones are more stable and as a result have lower energy.
by Monica Habashy 3A
Mon Oct 31, 2016 2:28 pm
Forum: Hybridization
Topic: Hybridization Order
Replies: 4
Views: 418

Re: Hybridization Order

Okay, thank you.
by Monica Habashy 3A
Mon Oct 31, 2016 2:27 pm
Forum: Resonance Structures
Topic: Stable Lewis Structures
Replies: 3
Views: 466

Stable Lewis Structures

If we're asked a question about VSEPR theory but it says to draw a lewis structure, does it matter if we just draw any lewis structure of the compound? Or do we have to draw the most stable resonance structure?
by Monica Habashy 3A
Mon Oct 31, 2016 1:46 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: D-block exceptions for midterm and f-block
Replies: 4
Views: 633

Re: D-block exceptions for midterm and f-block

And I don't think you need to know f block orbitals.
by Monica Habashy 3A
Mon Oct 31, 2016 1:46 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: D-block exceptions for midterm and f-block
Replies: 4
Views: 633

Re: D-block exceptions for midterm and f-block

I think the only two we need to focus on are copper and chromium.
by Monica Habashy 3A
Mon Oct 31, 2016 1:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Studying for the Midterm
Replies: 2
Views: 469

Re: Studying for the Midterm

Do practice questions from the course reader and the questions in the workbook as well.
by Monica Habashy 3A
Mon Oct 31, 2016 1:43 pm
Forum: Hybridization
Topic: Hybridization Order
Replies: 4
Views: 418

Hybridization Order

When writing out hybridization does it matter if we put d before s and p or after s and p? In the course reader it's written as dsp^3 but in the textbook solutions it's written as sp^3d.
by Monica Habashy 3A
Tue Oct 25, 2016 11:17 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Noble Gases and Electron Affinity
Replies: 3
Views: 489

Re: Noble Gases and Electron Affinity

If you look at electron affinity values, all noble gasses have an electron affinity of 0.
by Monica Habashy 3A
Tue Oct 18, 2016 11:06 am
Forum: Administrative Questions and Class Announcements
Topic: The First Quiz
Replies: 1
Views: 213

Re: The First Quiz

Hey, I just had discussion today and we got our actual quizzes and workbooks back. It says the points on it.
by Monica Habashy 3A
Wed Oct 12, 2016 10:24 pm
Forum: Ionic & Covalent Bonds
Topic: question 2.93
Replies: 3
Views: 462

Re: question 2.93

Yeah! Why would that not be the case?
by Monica Habashy 3A
Mon Oct 10, 2016 6:05 pm
Forum: Balancing Chemical Reactions
Topic: Specifying state of molecule
Replies: 1
Views: 349

Re: Specifying state of molecule

We use it to specify which state each compound is in when running the experiment, but I don't think it impacts the molecular coefficients at all.
by Monica Habashy 3A
Mon Oct 10, 2016 6:03 pm
Forum: DeBroglie Equation
Topic: De Broglie Equation Module Question
Replies: 1
Views: 290

Re: De Broglie Equation Module Question

It means that it doesn't have wavelike properties because it is too small to detect. Usually anything with a 10^-15 is the smallest wavelength that portrays these wavelike properties. Anything smaller cannot be detected consequently, you would say that it does not have wavelike properties.
by Monica Habashy 3A
Wed Oct 05, 2016 1:10 pm
Forum: Student Social/Study Group
Topic: Sunset Village Study Group
Replies: 17
Views: 1508

Re: Sunset Village Study Group

I'm In C7 and I want to join! Did you guys make the study group yet?
by Monica Habashy 3A
Wed Oct 05, 2016 1:07 pm
Forum: Student Social/Study Group
Topic: Rieber Hall 14A Study Group (Fall 2016)
Replies: 49
Views: 4375

Re: Rieber Hall 14A Study Group (Fall 2016)

It's not too late to join right?
by Monica Habashy 3A
Sun Sep 25, 2016 5:11 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework Assignment?
Replies: 7
Views: 785

Re: Homework Assignment?

Oh Alright! Thank you so much!
by Monica Habashy 3A
Sun Sep 25, 2016 11:42 am
Forum: Administrative Questions and Class Announcements
Topic: Homework Assignment?
Replies: 7
Views: 785

Re: Homework Assignment?

Do we have to do anything before tomorrow's lecture?

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