Search found 72 matches

by Ahmed Mahmood 4D
Sat Mar 16, 2019 7:01 pm
Forum: Calculating Work of Expansion
Topic: 7th Edition, 4.B.13
Replies: 2
Views: 174

7th Edition, 4.B.13

The question asks you to calculate an irreversible expansion from 4.52 L to 6.52 L under constant external pressure of 1.00 atm for part a. The answer to this should be 2.23, as the change in volume is 2.23 L and the pressure is constant, but the book puts it as 226 J. Why?
by Ahmed Mahmood 4D
Sat Mar 16, 2019 3:46 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Midterm Question 6
Replies: 6
Views: 263

Re: Midterm Question 6

Please, provide the full question when possible since we don't have full access to the midterms. Thanks in advance! :) “4 Moles of butane (C4H10) are used for cooking. What mass butane id this? Will this combustion do expansion work? Calculate change in internal energy for the rxn. Assume rxn will ...
by Ahmed Mahmood 4D
Sat Mar 16, 2019 3:09 pm
Forum: Second Order Reactions
Topic: 2nd order rates
Replies: 6
Views: 218

Re: 2nd order rates

I’d look through the textbook/notes and memorize concepts and formulas relating to third order rxn. Anything that isn’t mentioned probably isn’t necessary.
by Ahmed Mahmood 4D
Sat Mar 16, 2019 3:07 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Midterm Question 6
Replies: 6
Views: 263

Midterm Question 6

For question six on the midterm, you add work and change in enthalpy to get change in internal energy. I calculated 19.1 kj for work and 11.5 kj for change in enthalpy—how was my change in internal energy -11.5 kj?
by Ahmed Mahmood 4D
Sat Mar 16, 2019 2:28 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Midterm, Question 2.B
Replies: 3
Views: 64

Midterm, Question 2.B

Since the researcher’s publication was the reverse reaction of the original reaction, wouldn’t her equillibrium constant just be the inverse of the forward reaction’s equillibrium constant? If not, what is it supposed to be, and why did I get points taken off for my answer?
by Ahmed Mahmood 4D
Fri Mar 15, 2019 12:53 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Reduction Potential of Water
Replies: 1
Views: 48

Reduction Potential of Water

What is the reduction reaction and potential of water that we must refer to when covering topic 6.O?
by Ahmed Mahmood 4D
Fri Mar 15, 2019 12:42 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: 6.N.15 7th Ed
Replies: 1
Views: 56

6.N.15 7th Ed

"Calculate the potential of a cell constructed with two nickel electrodes. The electrolyte in one compartment is 1.0 M Ni(NO3)2. In the other compartment, NaOH has been added to a Ni(NO3)2 solution until the pH = 11 at 298 K. Use Table 6I.1" I’ve found the concentrations of both nickel ion...
by Ahmed Mahmood 4D
Fri Mar 15, 2019 1:44 am
Forum: *Enzyme Kinetics
Topic: 15.67
Replies: 2
Views: 386

Re: 15.67

Think about it like this: You have two reaction rates, and you want to compare how the factor is affected by the addition of a catalyst. You know that adding a catalyst changes the activation energy; you know that changing the activation energy changes the reaction rate; you know the formula for the...
by Ahmed Mahmood 4D
Fri Mar 15, 2019 1:40 am
Forum: *Enzyme Kinetics
Topic: Catalysts
Replies: 7
Views: 258

Re: Catalysts

It increases the rate of both of these reactions equally and leaves the equilibrium constant unchanged.
by Ahmed Mahmood 4D
Fri Mar 15, 2019 1:39 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: Rate vs. Initial Rate
Replies: 4
Views: 239

Re: Rate vs. Initial Rate

Rate depends on concentrations at various points in the reaction, while initial rate depends on the initial concentrations of the reactants.
by Ahmed Mahmood 4D
Fri Mar 15, 2019 1:37 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Platinum in Cell Diagram
Replies: 7
Views: 147

Re: Platinum in Cell Diagram

Platinum is an inert conductor added in order to conduct a charge. You add platinum when no other inert solids are able to perform conduction in the cell.
by Ahmed Mahmood 4D
Fri Mar 15, 2019 1:36 am
Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
Topic: Porous Disk and Salt Bridge
Replies: 3
Views: 209

Re: Porous Disk and Salt Bridge

They both serve the same purpose and thus have essentially no reasonable difference in this class.
by Ahmed Mahmood 4D
Fri Mar 15, 2019 1:36 am
Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
Topic: Electroplating
Replies: 2
Views: 160

Re: Electroplating

Electroplating makes use of redox reactions. For example, when zinc plates iron and this zinc coat is scratched, iron borrows electrons from zinc to keep itself from being oxidized and thus preventing rusting.
by Ahmed Mahmood 4D
Fri Mar 15, 2019 1:31 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst
Replies: 14
Views: 179

Re: Nernst

Yes--after balancing the redox reaction and finding the intermediate electrons transferred, you use this number of electrons as 'n,' as they are the moles of electrons.
by Ahmed Mahmood 4D
Fri Mar 15, 2019 1:30 am
Forum: General Rate Laws
Topic: intermediate molecules
Replies: 3
Views: 81

Re: intermediate molecules

Intermediate molecules are not a part of the overall reaction, as they are produced and consumed in separate elementary steps of the reaction.
by Ahmed Mahmood 4D
Fri Mar 15, 2019 1:29 am
Forum: Second Order Reactions
Topic: 2nd order rates
Replies: 6
Views: 218

Re: 2nd order rates

Yes. In order to get overall order, you simply add the powers of the reactants--so, two reactants of first order will form a second order rate law for the overall reaction.
by Ahmed Mahmood 4D
Fri Mar 15, 2019 1:25 am
Forum: Zero Order Reactions
Topic: Zero Order Reactions
Replies: 7
Views: 255

Re: Zero Order Reactions

Different order reactions have different numbers and sequences of steps to form the final product. They also have different powers in the rate law.
by Ahmed Mahmood 4D
Fri Mar 15, 2019 12:02 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 7D.5 Seventh Edition
Replies: 1
Views: 35

7D.5 Seventh Edition

In question 7.D.5, the solution manual shows that .59 is subtracted. This does not fall into line with the equation ln(k1/k2)=eA/R(1/T1-1/T2). How did they get this value then?
by Ahmed Mahmood 4D
Sun Mar 03, 2019 10:48 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: van't hoff equation
Replies: 6
Views: 113

Re: van't hoff equation

You can convert ln(x/y) to ln(x)-ln(y). To obtain x or y, you simply take e and raise it to -x or -y, respectively.
by Ahmed Mahmood 4D
Sun Mar 03, 2019 10:47 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: TEST 2
Replies: 3
Views: 106

Re: TEST 2

The Van't Hoff equation, provided on the equation sheet, was necessary for this. That being said, I did another method where I calculated the K using the relation between E cell and gibbs free energy and got the same answer, but I do not believe that that was the way you were supposed to calculate t...
by Ahmed Mahmood 4D
Wed Feb 27, 2019 2:24 pm
Forum: Balancing Redox Reactions
Topic: 6.K.3 Part d
Replies: 1
Views: 49

6.K.3 Part d

For 6.K.3 part D, how do we know
by Ahmed Mahmood 4D
Wed Feb 27, 2019 10:37 am
Forum: Balancing Redox Reactions
Topic: Balancing Hydrogen
Replies: 2
Views: 51

Balancing Hydrogen

I understand that to balance oxygen, you add water to the side of the equation that is lacking in oxygen. However, how do you know whether to add hydroxide and water or hydrogen when balancing hydrogen in a redox reaction?
by Ahmed Mahmood 4D
Sun Feb 10, 2019 9:25 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: calculation of change in entropy
Replies: 3
Views: 69

Re: calculation of change in entropy

You assume that temperature is constant in one case and that volume is constant in the other, then you add the results of both of those equations.
by Ahmed Mahmood 4D
Sun Feb 10, 2019 9:24 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Midterm Next Week
Replies: 6
Views: 133

Re: Midterm Next Week

No, as mentioned the content covered only goes to the end of entropy.
by Ahmed Mahmood 4D
Sun Feb 10, 2019 9:22 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: General entropy question
Replies: 9
Views: 127

Re: General entropy question

Entropy is based on the amount of positions that an object can occupy. Therefore, gasses and complex molecules have the greatest entropies, while solids and simple molecules have lower entropies.
by Ahmed Mahmood 4D
Mon Jan 21, 2019 8:54 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Salt formation
Replies: 3
Views: 71

Re: Salt formation

Salts can be formed when an acid and base come together and are neutralized, forming water and a salt.
by Ahmed Mahmood 4D
Mon Jan 21, 2019 8:54 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle on Temperature
Replies: 4
Views: 123

Re: Le Chatelier's Principle on Temperature

Heat can be seen as part of the reaction, with an exothermic reaction having heat in the products and an endothermic reaction having heat in the reactants. Thus, lowering temperature for an exothermic reaction will cause the reaction to sit to the right.
by Ahmed Mahmood 4D
Mon Jan 21, 2019 8:52 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Percent Protonation
Replies: 6
Views: 99

Re: Percent Protonation

Percent protonation is the concentration of the conjugate acid over the initial concentration of the weak base multiplied by one hundred.
by Ahmed Mahmood 4D
Mon Jan 14, 2019 9:32 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: change in pressure
Replies: 4
Views: 87

Re: change in pressure

The reaction's direction shifts to balance out any changes made on the system. Accordingly, if there are more moles of products, the reaction will shift to favor the reactants when pressure is added in order to retain a balanced system.
by Ahmed Mahmood 4D
Mon Jan 14, 2019 9:27 pm
Forum: Ideal Gases
Topic: R in PV=nRT
Replies: 11
Views: 204

Re: R in PV=nRT

R is a constant known as the gas constant. Its units are represented as Joules . mol^-1 and various other units such as atmospheres.
by Ahmed Mahmood 4D
Mon Jan 14, 2019 11:06 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Concentration Affecting K
Replies: 7
Views: 188

Re: Concentration Affecting K

No—K is based on the rate of the forward and reverse reactions, not the concentrations of the products and reactants. Changing concentration will simply cause an imbalance between products and reactants, but this imbalance will be undone as the reaction returns to equillibrium and the equillibrium r...
by Ahmed Mahmood 4D
Sat Dec 08, 2018 11:09 pm
Forum: Bronsted Acids & Bases
Topic: Base Strength
Replies: 4
Views: 164

Re: Base Strength

BrOH is a strong base, and thus it will naturally be stronger than most other bases.
by Ahmed Mahmood 4D
Sat Dec 08, 2018 11:07 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: HOCl vs HOI
Replies: 9
Views: 453

Re: HOCl vs HOI

HOCl's anion is more stable because chlorine is more electronegative and is more stable (via delocalization) than HOI.
by Ahmed Mahmood 4D
Sat Dec 08, 2018 11:05 pm
Forum: Sigma & Pi Bonds
Topic: Why are sigma bonds stronger than pi bonds?
Replies: 10
Views: 459

Re: Why are sigma bonds stronger than pi bonds?

For one, sigma bonds go directly into one another and have a greater overlap, which makes it stronger than pi bonds, which must go outwards and then connect across a gap. Moreover, I believe interactions w/ multiple bonds are stronger because they have multiple bonds, not necessarily because they ha...
by Ahmed Mahmood 4D
Sat Dec 08, 2018 11:00 pm
Forum: Naming
Topic: cis and trans
Replies: 4
Views: 106

Re: cis and trans

Not for naming, but it is important to know that a cis isomer has elements on the same sides of the molecule while a trans isomer has elements on the opposite sides of a molecule.
by Ahmed Mahmood 4D
Sat Dec 08, 2018 10:58 pm
Forum: Polyprotic Acids & Bases
Topic: H2SO4 vs H2CO3
Replies: 3
Views: 313

Re: H2SO4 vs H2CO3

Because HSO4- has sulfur, which has a greater electronegativity than carbon, the anion is more stable (Due to electron delocalization) and thus its acid is stronger.
by Ahmed Mahmood 4D
Sat Dec 08, 2018 10:56 pm
Forum: Hybridization
Topic: Hybridization on Test
Replies: 3
Views: 224

Re: Hybridization on Test

Yes--just because lone pairs are not written in a diagram does not always mean they are not there. As such, they must be accounted for in determining hybridization.
by Ahmed Mahmood 4D
Sat Dec 08, 2018 10:55 pm
Forum: Dipole Moments
Topic: London Dispersion
Replies: 5
Views: 364

Re: London Dispersion

Larger molecules with many electrons and a greater surface area can be capable of being stronger than dipole-dipole forces in limited cases.
by Ahmed Mahmood 4D
Sat Dec 08, 2018 10:38 pm
Forum: Calculating the pH of Salt Solutions
Topic: Salt Solution pH — 7th Edition 6.D.11
Replies: 2
Views: 204

Salt Solution pH — 7th Edition 6.D.11

In 6.D.11, we are supposed to identify the pH of the solution when dissolved in water. Part c is KF and has a pH greater than 7. Wouldn’t KF dissociate to form two conjugates of strong bases and acids and thus not affect the solution, leaving it at 7?
by Ahmed Mahmood 4D
Sat Dec 08, 2018 1:44 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Difference Between Polarizability and Polarizing Power
Replies: 3
Views: 293

Re: Difference Between Polarizability and Polarizing Power

Polarizing power corresponds to cations, the most polarizing power being found in the smallest cations with he greatest positive charge. On the other hand, polarizability corresponds to anions. The anions with the greater polarizability are the biggest. Whats the relation between polarizability and...
by Ahmed Mahmood 4D
Sat Dec 08, 2018 12:51 pm
Forum: Lewis Structures
Topic: Drawing radicals
Replies: 1
Views: 89

Drawing radicals

When drawing radicals, how do we know which element receives the ‘odd’ number of electrons (i.e which element gets seven electrons instead of eight)?
by Ahmed Mahmood 4D
Sat Dec 08, 2018 11:51 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg’s Equation - Hydrogen
Replies: 2
Views: 229

Rydberg’s Equation - Hydrogen

Is the hydrogen atom the only atom with which we will need to use Rydberg’s equation? Also, what is the constant?
by Ahmed Mahmood 4D
Sat Dec 08, 2018 9:41 am
Forum: Coordinate Covalent Bonds
Topic: Chelates
Replies: 4
Views: 277

Re: Chelates

405112316 wrote:Chelates are basically complexes that have ligands that form a ring of atoms around the transition metal ion. When ligands bond at more than one tie, they are likely to form a chelate.


Solid--what's a tie?
by Ahmed Mahmood 4D
Fri Dec 07, 2018 11:06 pm
Forum: Coordinate Covalent Bonds
Topic: Chelates
Replies: 4
Views: 277

Chelates

I don't exactly understand what chelates are (Beyond definition) or what their implications are--can anybody help me out with this?
by Ahmed Mahmood 4D
Fri Dec 07, 2018 10:36 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Difference Between Polarizability and Polarizing Power
Replies: 3
Views: 293

Difference Between Polarizability and Polarizing Power

What are the definitions of polarizability and polarizing power? What are the trends associated with cations and ions? What are the implications/what type of questions may we expect regarding such trends?
by Ahmed Mahmood 4D
Fri Dec 07, 2018 10:09 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: LDF
Replies: 7
Views: 201

Re: LDF

All molecules contain LDF, but they can also contain additional molecular forces such as hydrogen and dipole-dipole.
by Ahmed Mahmood 4D
Fri Dec 07, 2018 10:07 pm
Forum: Bond Lengths & Energies
Topic: bond strength
Replies: 3
Views: 272

Re: bond strength

If other factors such as chemical structure and atoms are controlled for, yes, this is true.
by Ahmed Mahmood 4D
Fri Dec 07, 2018 10:05 pm
Forum: Electronegativity
Topic: Radius
Replies: 13
Views: 402

Re: Radius

As you move down a column, more energy levels are added to an atom, causing increased distance between the nucleus and valence electrons. Due to electron shielding (the interference of inner energy shells in the interactions between outer energy shells and the nucleus), electronegativity decreases a...
by Ahmed Mahmood 4D
Fri Dec 07, 2018 9:58 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Degeneracy
Replies: 4
Views: 631

Re: Degeneracy

As many answers have stated, degeneracy refers to the number of possible quantum states on an energy level. A question might ask something like, 'How many degenerate orbitals are there in the p orbital of a carbon atom at ground level?' In this case, there are two degenerate orbitals in the p orbita...
by Ahmed Mahmood 4D
Fri Dec 07, 2018 9:53 pm
Forum: Properties of Light
Topic: De Broglie's equation [ENDORSED]
Replies: 7
Views: 447

Re: De Broglie's equation [ENDORSED]

Yes. De Broglie's equation is the equation that can be applied to objects w/ mass (Such as base balls and people) to determine their wavelength.
by Ahmed Mahmood 4D
Fri Dec 07, 2018 9:51 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Test #2 Question #2
Replies: 3
Views: 338

Re: Test #2 Question #2

The Heisenberg uncertainty equation goes as follows: (mass)x(Velocity)x(Uncertainty in position)>/=h/4pi Using the data from the problem, we can find that the cricket ball is travelling at .042 m/s (Using dimensional analysis). Its mass is given (We use kilograms for mass whenever planck's constant ...
by Ahmed Mahmood 4D
Fri Dec 07, 2018 9:42 pm
Forum: Photoelectric Effect
Topic: Work Function
Replies: 14
Views: 636

Re: Work Function

The work function can be thought of as the amount of energy required to discharge an electron from a metal surface. As such, the energy of the incoming photon-the work function=the kinetic energy of the discharged electron. The work function is sometimes given, but it can also be algebraically deter...
by Ahmed Mahmood 4D
Thu Dec 06, 2018 11:44 pm
Forum: Ionic & Covalent Bonds
Topic: Most Ionic Bond (2.D.3 7th ed)
Replies: 1
Views: 68

Most Ionic Bond (2.D.3 7th ed)

The textbook states that out of BaBr2, BeBr2, and BBr3, BaBr2 is the most ionic bond. Aside from difference in electronegativity/charge, what indicates that BaBr2 is more ionic than BeBr2?
by Ahmed Mahmood 4D
Tue Dec 04, 2018 9:45 pm
Forum: Naming
Topic: Transition Metal Names
Replies: 1
Views: 54

Transition Metal Names

Why is cobalt sometimes ‘cobalt’ and other times ‘cobaltate’ ? Moreover, is there a general transition metals list that we can refer to?
by Ahmed Mahmood 4D
Tue Dec 04, 2018 9:37 pm
Forum: Bronsted Acids & Bases
Topic: 7th Edition 6C.21.b
Replies: 1
Views: 66

7th Edition 6C.21.b

The question is: Is acetic acid or formic acid stronger?

According to the textbook, formic acid is slightly stronger.

Why is this the case? I figured that since acetic acid has more atoms, it would be more stable if a hydrogen was taken away due to electron delocalization.
by Ahmed Mahmood 4D
Tue Dec 04, 2018 9:31 pm
Forum: Amphoteric Compounds
Topic: Amphoteric compounds
Replies: 2
Views: 91

Amphoteric compounds

Is there a set, defined way to find out if a substance is amphoteric?
by Ahmed Mahmood 4D
Tue Dec 04, 2018 6:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam Questions
Replies: 1
Views: 1864

Final Exam Questions

Hi, the review session and exam locations upload states that the final will consist of questions from the homework and the online assessments. Can anybody confirm that this means that only focus questions, assigned homework, and the online assessments for audio-vidual focus topics will appear on the...
by Ahmed Mahmood 4D
Sun Dec 02, 2018 10:26 pm
Forum: Lewis Acids & Bases
Topic: acid names
Replies: 8
Views: 135

Re: acid names

I personally would memorize the more common acids and bases, especially if they appear on the homework.
by Ahmed Mahmood 4D
Sun Dec 02, 2018 10:25 pm
Forum: Bronsted Acids & Bases
Topic: Strong vs Weak Acid/Base Reactions
Replies: 4
Views: 78

Re: Strong vs Weak Acid/Base Reactions

Memorizing the different strong and weak acids and bases would be the best way to go about solving these types of problems.
by Ahmed Mahmood 4D
Sun Dec 02, 2018 10:24 pm
Forum: Naming
Topic: With Respect to the Final
Replies: 9
Views: 211

Re: With Respect to the Final

Given the fact that multiple homework questions necessitate the knowledge of both, it would make sense that you must know both for the final. After all, any one of those homework questions could appear on the final (The Final review session paper states that "Questions will come from the Homewo...
by Ahmed Mahmood 4D
Mon Nov 26, 2018 12:12 am
Forum: Ionic & Covalent Bonds
Topic: polar/nonpolar
Replies: 3
Views: 100

Re: polar/nonpolar

Polar molecules, or molecules with a larger dipole moment, have greater differences in electronegativity between atoms.
by Ahmed Mahmood 4D
Mon Nov 26, 2018 12:11 am
Forum: Ionic & Covalent Bonds
Topic: Intra vs Intermolecular forces
Replies: 9
Views: 692

Re: Intra vs Intermolecular forces

Since intermolecular forces are (far) weaker than intramolecular forces, they are easier to break.
by Ahmed Mahmood 4D
Mon Nov 26, 2018 12:09 am
Forum: Bond Lengths & Energies
Topic: How to Measure Bond Lengths
Replies: 4
Views: 87

Re: How to Measure Bond Lengths

You do not need to know the exact bond lengths, but you do need to know general trends that vary across different types of bonds. Exact bond lengths will be given if they are necessary, if I’m not mistaken.
by Ahmed Mahmood 4D
Sun Nov 18, 2018 11:12 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: hydrogen bonding
Replies: 11
Views: 244

Re: hydrogen bonding

Hydrogen bonding is extremely strong. Because of this, it takes more heat to break hydrogen bonds, leading to higher melting points among hydrogen bonds.
by Ahmed Mahmood 4D
Sun Nov 18, 2018 11:05 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: H-Bonding
Replies: 8
Views: 182

Re: H-Bonding

No. Typically, bonds between hydrogen and nitrogen, oxygen, and fluorine are hydrogen bonds.
by Ahmed Mahmood 4D
Sun Nov 18, 2018 11:04 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Intermolecular Forces
Replies: 7
Views: 190

Re: Intermolecular Forces

Determinant factors include strength, molecular size, and electronegativity. London forces are usually weaker. Smaller molecules are primarily dipole-dipole, while the inverse is true for London forces. Greater differences in electronegativity typically indicate dipole-dipole forces.
by Ahmed Mahmood 4D
Sun Oct 28, 2018 9:30 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity Trend
Replies: 9
Views: 216

Re: Electron Affinity Trend

Since electrons in the top right corner of the periodic table are closest to attaining eight valence electrons, they release more energy in order to receive that eighth electron and fill their outer shell.
by Ahmed Mahmood 4D
Sun Oct 28, 2018 9:28 pm
Forum: Trends in The Periodic Table
Topic: Atomic Radius
Replies: 7
Views: 164

Re: Atomic Radius

When an electron is removed, the proton:electron ratio heightens. Because of this, the surrounding electrons become more attracted to the protons in the nucleus, requiring more energy to remove said electrons and thus a higher ionization energy.
by Ahmed Mahmood 4D
Sun Oct 28, 2018 9:26 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 147
Views: 84080

Re: Advice from a Medical Student [ENDORSED]

From a premed who has been adjusting to UCLA's curriculum--thank you sm for this post and the advice!
by Ahmed Mahmood 4D
Sun Oct 21, 2018 11:52 pm
Forum: Properties of Electrons
Topic: Test question
Replies: 6
Views: 229

Re: Test question

As it wasn't covered in lecture, I don't believe so.
by Ahmed Mahmood 4D
Sun Oct 21, 2018 11:49 pm
Forum: *Black Body Radiation
Topic: Test
Replies: 9
Views: 502

Re: Test

I don't believe so. Dr. Lavelle mentioned it but explicitly said it was not something we'd need to understand in class, so I don't believe it will be on the test.
by Ahmed Mahmood 4D
Sun Oct 21, 2018 11:43 pm
Forum: Properties of Light
Topic: Test 2 Equations
Replies: 14
Views: 295

Re: Test 2 Equations

I think that most equations will be on the cover sheet of the test, but equations that are specifically tied to content in 'The Quantum World' that we are supposed to memorize and/or derive are not.

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